One of the best known products for thermal & acoustic insulation, Twiga Insul is light gold in colour and is a light weight, compressible insulation material consisting of fine, long, inorganic glass fibers bonded together by a high temperature binder.

Twiga Insul is available in rolls, slabs and boards, in various densities and thicknesses and with a wide range of factory applied facings which include reinforced aluminum foil, fiberglass tissue, black glass tissue and a wide range of imported premium facings.

Twiga Insul for Thermal & Actoustic Insulation

Fire Safety

Twiga Glass Wool made from pure silica sand will not support combustion even in direct, prolonged contact with flames. It emits no toxic fumes or smoke, the two biggest hazards to health and life in the event of a fire. Glass wool is a complete fire safe product complying the following standards:

  • BS (British Standard) 476 part 4, ISO 1182, IS 3808, International Maritime Organisation (IMO) - NON COMBUSTIBLE
  • BS 476 part 6 - Do not PROPOGATE FIRE
  • BS 476 part 7- Class 1 - SURFACE SPREAD OF FLAME NIL
  • Class O certified - Highest class for any building material - index of performance (I) not exceeding 12, sub index of performance (i1) not exceeding 6, Class 1
  • BS 476 part 5 - Class P - (not easily ignitable) - BS 6853 (toxicity index 0.65) - NON EMISSION OF SMOKE & TOXIC GASES

Acoustic Performance

TWIGA Glass Wool with its outstanding Acoustic performance has excellent acoustic absorption characteristics. Whether it is sound insulation for Industry, commercial premises, public buildings or domestic applications, Twiga Insul outperforms others.

Thermal Performance

Cooling costs in a building insulated throughout with glass wool can be reduced significantly. The use of glasswool for the thermal insulation of external walls and ceilings has been shown to reduce energy consumption by 20% to 30%.

Performance on Site

  • Twiga Insul can be compressed to around an eighth of its original volume when packaged.
  • Easier to load, easier to transport, easier to unload and store on site.
  • Recovery after compression is more than 95% in accordance with 1S 8183 / BS 3958 Part 5 means there is a immediate recovery after unrolling or release of pressure so it is ready to use almost as soon as it arrives on site.
  • Twiga Insul is stable under varying conditions of temperature and humidity when applied correctly.
  • Excellent tear strength and not prone to sagging or settling. Rigid slabs have inherently high compressive strength.
  • Does not settle down while subjected to Vibration and Jolting. Conforms to IS 3144 / BS 2972
  • Flexible, elastic and lightweight means it can be applied easily, anywhere it’s needed. In roof spaces. In wall spaces. In the most awkward corners. Even in the highest of vertical applications. And in most applications, without the need for fixings. These characteristics mean that TWIGA glass wool is almost always the lowest installed cost acoustic and thermal insulant.

Environmental Performance

Glass wool is one of the most environmentally friendly, stable and sustainable insulants available. Its raw material is silica sand, the earth’s most abundantly occurring natural material. And its impacton the environment in manufacture, use and disposal is minimal.

  • Zero Ozone Depleting Potential
  • Minimum VOC
  • Uses abundant and renewable raw materials.

Temperature Range

Twiga Glasswool is suitable for applications ranging from minus 195°C to 230°C. For special applications upto 450°C, high temperature binder is available. Aluminum foil facing is suitable upto 120°C.

Chemical Stability

Twiga Glasswool is chemically inert. Application does not cause or accelerate corrosion.

Twiga Glasswool is rot proof and odourless. Conforms to IS 3144.

Shot content is nil, exceeding requirements of IS 3144 / BS 2972

No Mould growth. Conforms to IS 3144.

Moisture content and water absorption is less than 2% in accordance with IS 3144 / BS 2972

Twiga Glasswool superior tensile strength, handleability, resilience, low thermal conductivity, relatively high THERMAL RESISTANCE (R Value) along with its superior Fire safe properties (Non combustible) and excellent noise reduction properties makes it suitable for a wide variety of thermal & acoustic insulation applications ranging from HVAC, metal roof and building insulation to applications in solar collectors and generator acoustic enclosures & is recommended for use both in hot & cold application ranging in temperature from -195degrees to plus 450 degrees centigrade. As Twiga Insul repels moisture and it contains nothing organic to support micro organisms, it won't sustain rot, fungi or bacteria.

TWIGA Insul Duct Wrap Ductwrap, a light weight thermal insulation blanket having long product life is specifically designed to wrap around air conditioning ducts. Manufactured from fine, stable and uniformly textured non combustible inorganic glass fibers bonded together by a non water soluble and fire retardant binder.

Features & Benefits

Higher thermal resistance (R Value)

Minimising the loss of heat from the working fluid to the surrounding space will save energy and cost - provide uniform temperature of the supply air. It is noticeable that the efficiency of an insulation material directly depends on the thermal resistance(R - Value).

More thermal resistance less heat loss & gain inside the duct. To achieve higher thermal resistance (R-Value) is required more thickness of insulation material, if thermal conductivity of the insulation material is approximate same in same unit and mean temperature.

Thermal Resistance “R” Value

R = L K

Where 'L' = Thickness of Insulation material (m)

'K' = Thermal Conductivity (W/m ºC)

“R” = m2 ºC/W or hr.ft2. ºF /Btu

R-Value is a measure of the resistance to heat flow of a material of any given thickness

Non Combustible

Prevent fire risks from the content of the services and protecting HVAC equipment from external fire damage.

High noise attenuation properties

Offers exceptional acoustic properties and enhances indoor environmental quality by absorption of mechanical noise generated by air conditioning equipment.

Condensation control

appropriate thickness of Insulation as per ambient temperature & relative humidity is used. The moisture carrying capacity of the air is related to its temperature.

When moist warm air comes into contact with cold surfaces eg. Pipe and ducts, the air is cooled and will produce precipitation on the cold surface.

Health issues/quality of indoor air

Fiberglass wool has no health hazard in any normal conditions. International Agency for Research on Cancer (IARC) monographs /WHO report (2002) explicitly states that glass wool is not carcinogenic to humans.


TWIGA Insul Duct wrap is available with a wide range of factory applied facings, FSK, Tough Guard, and Black Woven Glass Cloth & FGT.

Thermal Properties

Significantly reduces heat gain & losses.

Fire Properties

Non Combustible tested as per BS 476 part 4 and ISO 1182, IS 3808 & IMO (FTP)


Odorless, inert and fully compatible with all standard building material components Does not encourage growth of fungi & vermin. Non Hygroscopic

Tools needed for Installation

Tape Measure, sharp knife/blade, straight edge & strapping equipment

Installation Guidelines

The duct should be covered with two coats of cold applied bitumen/CPRX or any other equivalent approved product after cleaning the surface & sealing all joints against leakages.

The insulation of specific R-value and thickness should then be cut to appropriate length and stuck to the duct while the adhesive is still wet.

All longitudinal joints and circular overlaps should be sealed with aluminium foil tape (50mm width) to make the installation leak proof. For large ducts, where adhesive pins have been used, speed washers/clips should be covered completely with Aluminium foil- tape to have an air-tight finish.

Handling & Storage

Store product undercover and in dry conditions. Store flat. Handle with care, especially on the edges and corners, which can be damaged if subject to sharp or heavy impact.

Architectural Specification

Insulation material for Duct Wrap shall be lightweight blanket of non combustible Bonded Fiber Glass Wool Insulation - Supply Duct- having thermal resistance R 1.4 (24KG/m3-50 mm), Return Duct - R 0.6 (24kg/m3-25mm) suitably factory laminated with appropriate vapour barriers as per the ECBC/ASHRAE standards.

Twiga Insul Preformed Pipe Sections, designed for easy and rapid “snap-on” installation are a one piece moulded insulation made from shot free non combustible glass fibers bonded together with a high temperature resistant binder for pipe diameter from 20mm NB to 300mm NB. The section is available with / without factory laminated aluminium foil facings.

Twiga Lamella Mats are made from glassfiber wedges laminated with aluminum foil. Lamella Mats are compression resistant (maintains thickness at bends), easy to handle and are suitable for large pipes of diameter from 300mm NB and above.

Twiga Insul Pipe Sections and Lamella Mat is suitable for the thermal and acoustic insulation of:

  • Heating and hot water service pipes
  • Steam pipes up to 230ºC with bare pipe section.
  • BS 476 part 7- Class 1 - SURFACE SPREAD OF FLAME NIL
  • Chilled water and cold water service pipes

Features & Benefits:

  • Green Building Material : Low embodied energy, Zero ozone depleting potential, Minimum VOC
  • Fire Safe : Non combustible, Does not emit toxic fumes
  • Excellent thermal resistance at low cost(low thermal conductivity)
  • Low cost : Easy and fast to install
  • Non corrosive to metal : No shot content / impurities
  • Non hygroscopic
  • Resistant to chemicals, oil, fungus, bacteria, rot and vermin attack

Installation Guidelines:

Pipes shall be thoroughly cleaned with wire brush and rendered free from all foreign matter and grease and primer coated.

The pipe should be inspected and all joints should be sealed against leakages.

The pipe should be inspected and all joints should be sealed against leakages.

Fiberglass wool rigid sections shall be fixed tightly to the surface. All joints to be sealed properly. Fixing and sealing compound shall be CPRX. All joints of Aluminum foil shall be sealed properly by means of 75 mm wide self adhesive aluminium tape.

2 inch nylon band shall be tightly wrapped on the surface of PS at an interval of 300-500 mm interval.

For further mechanical protection, Aluminium cladding / sand cement plastering is recommended.

Handling & Storage:

The pipe sections should be stored in dry condition in closed cartons. Store vertical.

Architectural Specification :

  • The Fiberglass wool insulating material shall be applied for Chilled/ hot Water pipes as under.
  • Fiberglass wool insulating material shall be applied for Chilled/ hot Water pipes as under. The rigid pre-formed molded sections of fiberglass wool having a uniform density of 80±15% Kg/m3 and thermal conductivity shall not be more than 0.030 W/m.K at 25º C mean temperature also shall confirm IS 9842 The material for piping insulation shall be factory laminated one side with Aluminum foil on the outside. The Aluminum foil shall extend by a minimum 50 mm on one side of the
  • pipe section along the length to seal all longitudinal joints. Bonding of insulation material shall be with a cold setting compound.
  • The thickness of insulation material shall be selected as per diameter of pipes.

Twiga Flexible Duct designed for HVAC systems is light weight, strong, fully flexible and compressible yet dimensionally stable.

Twiga Flexible Duct is made of double lamination of films permanently bonded to a coated spring tough steel wire helix. Thermal efficiency is provided by wrapping the exterior with a blanket of fiberglass wool insulation in various densities & thicknesses for required thermal resistance. The outer jacket is made of double laminated film with fiberglass yarn reinforcement, which acts as a vapour barrier surface as well.

Twiga Flexible Duct can widely be used in all Air Conditioning / Ventilating Systems including commercial & office buildings, hotels, hospitals and many other industrial and residential applications.

Twiga Flexible Ducts come in a variety of styles and constructions and provide the most economical solution to your air handling needs.

Features & Benefits:

  • Air tight – No air leakage, No fiber erosion
  • Insulation – “Twiga Insul” – Class O rated Glasswool
  • Core material – Low friction loss, strong and flame resistant
  • Vapour barrier – Reinforced for maximum toughness and tear resistance
  • Wire – Strong and non corrosive
  • Modular and economical air distribution system with maintenance free life - high degree of flexibility which allows it to be connected to any desired position
  • A quick and economical means of correcting misalignment between system components.
  • Available as bare and preinsulated
  • Reduces total installed cost – Fast and easy to install
  • Allows ducting around obstacles where fabricated and fitted ducts would be difficult and costly to install.

Installation Guidelines:

All the flexible duct shall be installed in a fully extruded position and bends made with adequate radius.

The maximum allowable sag, between any two adjacent suspension points, should not exceed 50 mm per meter.

The distance between any two adjacent suspension points may vary from 1.50 to 3.00 meter, depending upon the type of flexible duct in use.

Flexible ducts mounted above suspended ceiling should always be independently supported.

All bends should be made as large as possible and should have a radius of not less than the diameter of the duct in use. Double bends should be avoided, however if un-avoidable, ensure that each radius is not less than R = 2 x D.

Ideally the hanging straps should supports the flexible duct with a minimum of half the circumference surface in contact, and without reducing the effective inside diameter of the duct. It is also recommended that the minimum width of material to be used for the hanging straps should be at least 25 mm.

Extra care should be taken when making connection to fixed conventional ducts, etc., and ensure that they do not become too stressed. An additional support is recommended to overcome the potential problem.

Light railing is a good alternative hanging support when using long length of flexible duct.

Specification :

  • Uninsulated flexible duct shall be made of double lamination of metalised polyester film permanently bonded to a coated spring steel wire helix. Duct shall be in tear and puncture resistant construction.
  • Insulated flexible duct - Inner core should be made of double lamination of polyester film permanently bonded to a coated spring steel wire helix. Blanket of fibreglass insulation of R 4.2 (RSI - 0.76 m2K/W) having density of 24 kg/cu.meter and thickness of 25 mm shall be wrapped over the inner core & covered with tear and abuse resistant outer jacket cum vapour barrier made of fibre glass reinforced double layer of metalized polyester film laminate.


Fiberglass duct board is a rigid board of insulation material manufactured from resin bonded inorganic glass fibers. The exterior surface of the board is a factory-applied reinforced aluminium foil-air barrier and water vapour retarder. The edges of the board are formed by machine to create a ship lapped edge or grooves, to allow the grooves to be joined to build straight ducts of any size or length. Duct system components such as tees, offsets, elbows and transitions may be fabricated from flat duct board. Fibrous glass duct boards are fabricated into ducts to make a fibrous glass duct system.

Features & Benefits:

  • Fire Safe - Made from rigid glasswool boards which provides thermal and acoustic insulation
  • Faster installation - Easy to install and light weight
  • Lower installed cost - Minimal material waste, higher productivity
  • Flexibility of site fabrication and assembly – Adaptable to job site changes
  • Precision of factory made ducts – Low leakage rates
  • Improved performance and energy savings
  • Excellent aesthetics - Cleaner look
  • Outer facing provides resistance, stiffness and a vapour barrier and inner facing provides a smooth and cleanable surface

Glass wool duct for thermal application

Pre-insulated duct board shall be made of high density of rigid resin bonded fire safe glass wool with both side factory laminated aluminum foil, outer facing foil is having - Reinforced aluminum + Kraft+ glass veil and inner facing - Black glass textile.

The thermal conductivity of duct board shall not be exceeding 0.033 W/m K at 10 deg C means temperature and thermal resistance should be more than 0.6 m2.K/W.

Glass wool duct panels shall be tested as per EN 13403 Vapour permeance of duct panels should be approximate value: 0.013 g/m2. day mm Hg (outer facing)

Mechanical stiffness: R5 rigidity, according to EN 13403 (European Standard for non metallic ducts) this rigidity is the maximum level of the ones established by this standard.

Duct board should withstand pressure under 800 Pa with no evidence of fissures or swelling (test according to EN 13403)

Fire test: Panels shall be tested as Euroclass: Euro class C-s1, d0

  • s1: null smoke emission
  • d0: non flaming droplets / particles.

Joint System: Duct boards should have exclusive design with male / female edges, in order to provide greater strength for joints, easy installation and shall reduce the number of cutting operation & exceptional inside finish.

Tools and Accessories for Installation of Duct Boards shall be followed as per recommendation of manufacturer’s manual.

Duct Support: Duct board shall be installed, using support as described in installation manual of manufacturers. Maximum distance between hangers / support shall not exceed for horizontal ducts as

  • 900 mm inner dimension maximum distance of hanger 2.4 m
  • 900-1500 mm inner dimension maximum distance of hanger 1.8mm
  • Above 1500 mm inner dimension maximum distance of hanger 1.2 m

Inspection and Testing

Duct dimensions shall be checked based on the duct dimension / layout drawings duly approved by the Architects/ Consultants.

The ducts, branches elbows etc. shall be inspected and the joints and connection shall be checked properly before these are assembled in position. After assembly the system shall be checked for tightness of male/ female joints to avoid the leakage

Climaver Al. tape of 75mm thickness shall be applied on each male / female joint to avoid the leakage of air

Full sized standard dimension sheet as specified are to be used and any patched or made-up pieces of duct work are liable to be rejected. Joints between male/ female connections shall be fitted properly and Al. tape of 75 mm thickness shall be applied on joints.

Test points shall be provide at the discharge of each air handling unit and at each individual zone of the duct work system. Test points shall consist of 25mm diameter sockets fitted with sealing plugs which can be removed for the fitting of measuring devices. Test points shall be insulated as for the duct work and shall be provided with identification labels.

Rectangular risers should be free supported by angles or channels secured to the sides of the duct flanges with bolts or sheet metal screws or blind rivets. The supporting angle or channel should be freely resting over the slab cut-out. Riser support intervals should be limited to one storey height.

To ensure the air tightness, all ducts shall be checked with Leak Test after completion of duct fabrication but before installation of duct system.


Twiga Fiberglass Pipe Wrap is a thin flexible, uniform felt, composed of glass fibres in an open porous structure, bonded with phenolic binder that is compatible with hot coal-tar enamel. The mat may be of the reinforced or non-reinforced type.

For water, crude oil and gas pipelines, the anti-corrosive protections mostly utilized are hydrocarbon base systems (oil or pit carbon derivates) mixed with mineral fillers and reinforced with Twiga Fibreglass Mat (normally utilized as “INNERWRAP”) and impregnated Twiga Fiberglass Mat (as “OUTERWRAP”)

Coating with Twiga Pipe Wrap ensures a higher mechanical resistance, uniformity of thickness and permanent adhesion to the pipe line walls.

Twiga Pipe Wrap conforms to International standards (AWWA C 203 latest versions / IS 10221 – 1982) for anti-corrosion coatings of pipe works as well as to the technical specifications provided by the major pipeline engineering groups.

Features & Benefits:

  • Flexible – Pliable, do not crack (yarn tear)
  • Open porous structure – can be easily impregnated, uniform coating (single homogeneous unit)
  • High tensile strength / breaking, tear strength – Resistant to longitudinal / transverse tension, provides reinforcement, protection from mechanical damage due to strain on pipe during handling - laying, commissioning & operation, withstand pressure due to soil movement, cold bending etc.
  • Chemical Resistant (Inert) – Chemically stable, compatible with anticorrosive chemicals / coal tar and bitumen, resist degradation from corrosion electrolyte, unaffected by weather agents, withstand attack from bacteria, chemicals contained in soil, no mould growth
  • High temperature resistance / tolerance - thermally stable, stable up to 288 0C, can be used in both hot & cold application, unaffected under load in hot bitumen at 288 0C, structural, composition stability
  • Inorganic composition – non biodegradable, does not rot and decay.
  • Hydrophobic – does not absorb moisture, when applied with coal tar, it is impermeable to water
  • Fire properties – Non inflammable (phenolic resin), reduce fire hazards
  • Smooth surface - Uniform fiber distribution / uniformly bonded felt / unilateral spread of fibers, structural/ dimensional stability, no bubbles / wrinkles / no flakes of undispersed chop strands, even thickness while impregnating in coal tar no blister formation / edge break / disintegration of fiber strands, does not get torn / damaged while applying coating.
  • Additional strength added by yarn reinforcement spacing option.
  • U.V.Protection


Twiga Fiberglass INNERWRAP shall be mechanically applied by continuous end feed machine or by a lathe-type machine or by other approved application equipment. Application shall be simultaneous with the first coat of coal tar enamel. The roll of inner wrap shall be under tension sufficient to embed the fibre glass tissue in the enamel before the latter sets or cools. The wrapper shall not be pulled through the hot enamel to the metal surface.

The three methods of application of wrapping materials that can be followed are-
(a) Mill wrapping
(b) Site or yard wrapping
(c) Line wrapping

The choice between the three methods of application of pipe wrappings shall depend on a detailed assessment of site conditions and the technical aspects, including corrosion engineering and economic factors involved in the construction work. The conditions which decide the selection of wrapping method are:
(a) Weather conditions
(b) Site conditions
(c) Size of pipeline
(d) Location of site

Twiga Fiberglass Tissue is saturated with Coal Tar enamel The resultant Twiga Fiberglass Tissue based OUTERWRAP shall be uniform, flexible and of uniform porosity to facilitate the release of hot gases and achieves better finishing. The outer surface of OUTERWRAP shall be lightly dusted with talc, fine sand, or other approved mineral powder sufficient to prevent sticking in the rolls under condition likely to be met at site. The inside surface shall receive minimum dusting, as excessive amount may impair the bond between outer wrap and enamel.

OUTERWRAP shall be mechanically applied in a continuous end feed machine or in a lathe-type machine or by other suitable outerwrap application equipment. The OUTERWRAP shall be applied to, but not buried in, the outer surface immediately following the final coat of enamel.

Handling and storage

Twiga Fiberglass Tissue comes in roll form wrapped on a core and packed in a corrugated box / corrugated sheet and needs to be handled a as per prescribed methods to prevent tissue and pipe core from getting damaged. The boxes should be kept vertically as indicated in the box.


Most of the civil and industrial roofs are protected by a water proofing system which normally consists of two or more bituminous membranes of either modified (by thermoplastic polymers) or oxidized bitumen and reinforcement felt.

Twiga Fiberglass Tissue can be used in two manners –

Conventional felt method ‘IN-SITU’ water-proofing method when the fiberglass tissue is embedded into bitumen at site.

The bituminous membranes are subjected to severe operative conditions therefore the reinforcement layer needs to conform to the following requirements:

  • It must be rot-proof.
  • It must offer optional dimensional stability.
  • It must be easily and uniformly impregnated by bitumen during the manufacturing process.
  • It must offer sufficient tension resistant to allow a correct manufacturing speed and grant the required mechanical resistance to the bituminous membranes, both for the application work and to withstand the most severe operative conditions.

The characteristics of Twiga Fiberglass Tissue conforms to the various requirements of the sector and the membranes manufactured with the reinforcement material are suitable for all types of waterproofing systems, Twiga Glass Fibre Tissue conforms to the standards for reinforcement of felts and bituminous membranes for waterproofing systems.

Glass Fibre Base Coal Tar Pitch and Bitumen Felts (IS 7193-1994)

As a base membrane in Coal Tar Pitch and Bitumen Felts, Twiga fibreglass tissue used is flexible uniformly bonded, mat composed of chemically resistant borosillicate staple glass fibres, distributed in a random open porous structure, bonded together with a thermosetting resin with following physical properties -

  • Weight - The minimum weight of the tissue shall be 40g/m2.
  • Thickness - The nominal thickness of the tissue shall be 0.5 + 0.1mm.
  • Tensile Strength - The minimum tensile strength of the tissue shall be 45 kg/150 mm width in the longitudinal direction.
  • Porosity - The tissue shall have a porosity when related to pressure difference across the sample of not less than 06mm and not more than 1.9mm at and air velocity of 1m/s.

Glass fibre base bitumen felts are suitable for water proofing and damp-proofing in buildings and other situations where penetration of moisture to be stopped. Glass fibre base felt has the advantage that it does not rot by continued exposure to moisture conditions.

Glass fibre felts used for water proofing and damp proofing are -
a) Type 2, Grade I - Talcum mica or sand surfaced glass fibre base bitumen felts for water proofing.
b) Type 2, Grade II - Talcum or sand surfaced glass fibre base bitumen felts for damp proofing.

Features & Benefits:

  • Does not absorb moisture and therefore prevents the Ingress of moisture into the material. Thus incidence and fear of moisture pockets and blisters is greatly reduced to the minimum.
  • Non-wicking.
  • Strong and flexible and follows roof contours quite easily.
  • Non-inflammable, reducing the fire hazards due to flame spread.
  • Porous and hot bitumen impregnates it easily and strongly.
  • Non-rotting. When an organic based waterproofing is damaged as a spot, it wicks moisture and rots, both moisture and rots spread rapidly. Repair in this case involves removing a large area of the organic reinforcement. With Glass Fibre Tissue any external damages may be patched up quickly and with comparative ease.


The bitumen glass fibre base felt consists of a continuous sheet of resin bonded fiberglass treated with bitumen. The coating shall be uniformly applied. The resultant coated felt shall be given a superficial application of mineral powder to prevent the layer of the coated felt sticking together in the roll. This also gives useful protection against the affect of the sun and when laid on roofs, does not need further treatment unlike other types of self-finished felt.


Unless otherwise specified, glass fibre base bitumen felts shall be supplied in widths of one metre and generally in lengths of 1 metre, 10 metres and 20 metres. Coaltar treated glass fibre felts shall be supplied to the required widths generally in length of 75mtr.


The system is comparatively easy to lay and is monolithic in its entirety from the surface it is laid upon to the finish. It acts like continuous reinforced matting over the substrate irrespective of the no. of layers of bitumen/glass fibre tissue, since the glass fibre has an open texture into which bitumen can permeate. The first bitumen/glass fibre tissue layer bonds itself to the surface upon which it is laid and a very subsequent unit layer bonding to the layer below homogeneously because the hot bitumen poured over the previously set course dissolves a part of it and interdiffuses into it, resulting in perfect compatibility of the two.

The bond of the bitumen with the glass fibre tissue, i.e. the internal bond of the system within itself and its bond with masonry is good since no failure of this type has been observed in the pull out test. The confirmations of the adhesive bond of the glass fibre tissue with bitumen has been further borne out by the visual observation in the pull out tests, natural and accelerated weathering tests in which no separation of the reinforcement has been observed. This bond is an important factor which contributes to the ultimate strength and durability of the system. High heat resistance and durability of the glass reinforcement of the system due to its ceramic nature is another positive point in the longevity of its life”.


When pipes and vessels are operating at lower than ambient temperatures, they are normally insulated for maximum plant efficiency. Moisture vapour may migrate through the insulation or its joints, condense at the dew point temperature, and freeze if the temperature reaches OO C.

Wet insulation can be up to 20 times less efficient than dry insulation, whilst freezing can cause physical break-up of the insulation structure because water expands on becoming ice. Hence requirement of Vapour Barrier becomes critical and Twiga Fiberglass Tissue improves handle ability and provides support to Insulation material.


Twiga Fiberglass Tissue have excellent bonding property with all kinds of mastics, sealants, adhesives, fire resistive coatings, anti Abrasion coatings, self setting cement etc. as used in thermal insulation.

  • Looks good
  • Protects all insulation Materials
  • Stays clean

Twiga lining mat completes the vapour barrier & makes it more efficient. Twiga lining mat also acts as a fire resistive and corrosion resistive protective coating and prevents failure of vapour barrier finish.


Twiga Surface Tissue as the name suggests is a very thin tissue of fiberglass made of randomly oriented glass fibers distributed in a polystyrene binder.

Surface Tissue having excellent chemical and weather resistance is very smooth and porous and lies underneath the gelcoat.

Twiga Surface Tissue is ideal for improved surface finishes and imparts added strength to moulded FRP products Once fully hardened and sealed with resin or a gelcoat, fiberglass is waterproof, relatively light weight and when done properly it is extremely strong. It is reasonably inexpensive when compared to the alternatives.

Twiga Surface Tissue is available for both Pipe and Tank Winding (with Insoluble binder) and Hand Lay Up application (with soluble binder).

In Pipe Winding application, Twiga Surface Tissue can improve the product surface property on corrosion resistance, compressive strength, seepage resistance and longer service life.

In Hand Lay Up application, Twiga Surface Tissue is used in the product with complicated geometric curve. With the advantages of good pattern fitness, quick resin permeating, Twiga Surface Tissue can improve the intensity and corrosion resistance of the products. It is also suitable for spraying; pattern pressing and other FRP pattern technology. It is the essential conent of the fiberglass products and high quality pattern.


Twiga Fiberglass Tissue have excellent bonding property with all kinds of mastics, sealants, adhesives, fire resistive coatings, anti Abrasion coatings, self setting cement etc. as used in thermal insulation.

  • Imparts a reinforced resin – rich surface for general FRP products
  • Suitable for hand lay-up or press moulding where intricate contours are present and also for pipe and tank winding application
  • Multicompatibility binder results in softer and more flexible tissue and improved surface - laminate bonding
  • Resin - rich surface prevents crack formation and improves visual appearance of final product