Lexicon | Reinforcement Fibres
Woven Glass Fabric: Properties, Weave Types and Processing
Woven glass fabric, also known as glass filament fabric, is a woven reinforcement material for high-quality GRP laminates. It is suitable for epoxy resin and polyester resin and is used wherever controlled fibre orientation, good strength and clean surfaces are required.
Summary
Woven glass fabric consists of glass fibre yarns woven together at right angles. Depending on the weave type, it offers either higher dimensional stability or better drapability. It can be processed with polyester resin or epoxy resin and is suitable for repairs, mould making, boat building, model making and technical laminates.
At a Glance
- Woven reinforcement fibre made from warp and weft yarns
- Can be processed with epoxy resin and polyester resin
- Main weave types: plain, twill and satin weave
- Suitable for clean, strong GRP laminates
- Symmetrical lay-up reduces internal stresses
Definition
What is woven glass fabric?
Woven glass fabrics are fibre systems in which glass fibre yarns are crossed and woven together at right angles. During weaving, the base yarns run lengthwise as the warp, while the yarns running across them are called the weft.
Different fabric types are created by the way warp and weft are interlaced. The most important weave types for woven glass fabric are plain weave, twill weave and satin weave.
Unlike chopped strand mat, woven glass fabric has an ordered fibre structure. This makes it easier to plan fibre direction, strength and laminate lay-up in a controlled way.
Resin Systems
Processing with Epoxy Resin and Polyester Resin
Woven glass fabric can be processed with both epoxy resin and polyester resin. The right resin system depends on the application, adhesion requirements, water exposure, budget and desired mechanical performance.
Practical Tip
For high-quality laminates, boat building, wood bonding or components exposed to water, epoxy resin is often the better choice. For classic GRP repairs, mould making and economical laminating work, polyester resin is frequently used.
| Criterion | Epoxy resin with woven glass fabric | Polyester resin with woven glass fabric |
|---|---|---|
| Adhesion | Very high | Good on polyester laminates |
| Water resistance | Very good | Depends on application |
| Processing | Exact mixing ratio required | MEKP hardener addition according to instructions |
| Typical application | Boat building, wood, carbon and visible parts | GRP repair, mould making, larger surfaces |
Fabric Types
Weave Types of Woven Glass Fabric Compared
The weave type influences how well the glass fabric adapts to curves, edges and complex shapes. It also affects dimensional stability and handling during laminating.
| Weave type | Property | Advantage | Recommended application |
|---|---|---|---|
| Plain weave | Tightest interlacing of warp and weft | High dimensional stability | Simple components with limited three-dimensional shape |
| Twill weave | Looser interlacing than plain weave | Better drapability | Components with medium geometry |
| Satin weave | Even fewer interlacing points | Very good adaptation to complex shapes | Strongly curved or complex components |
Plain Weave
Woven glass fabric in plain weave has the tightest interlacing of warp and weft. The pattern resembles a chessboard. Its main advantage is high dimensional stability, while its drapability is lower. This weave is especially suitable for flat or only slightly shaped components.
Twill Weave
Woven glass fabric in twill weave has fewer interlacing points than plain weave. This increases drapability, while dimensional stability is slightly reduced. Twill weave is a good choice for components with medium three-dimensional shape.
Satin Weave
Woven glass fabric in satin weave is particularly easy to drape. Compared with twill weave, it has even fewer interlacing points. This makes it easier to adapt to complex geometries, but it is more sensitive to shifting during cutting and laminating.
Technical Detail
Crimp: Why Fibre Waviness Matters
One technical disadvantage of woven glass fabric is known as crimp. This refers to the waviness of the fibres caused by the weaving process. Since the fibres are not completely straight and unidirectional, a certain amount of crimp is unavoidable in woven fabrics.
Increasing crimp can reduce the stiffness and compressive strength of the component. In practice, this effect is often compensated for by a suitable lay-up or by combining woven glass fabric with glass fibre non-crimp fabrics. Such a laminate structure combines the advantages of woven fabric and non-crimp reinforcement and is frequently used in mould making.
Important for Load-Bearing Components
For components with high mechanical requirements, it is not enough to consider only the fabric weight. Fibre direction, weave type, resin system, number of layers and symmetrical laminate lay-up are also decisive.
Processing
Recommended Lay-Up for Woven Glass Fabric
For laminates made with woven glass fabric, a planned lay-up should be followed. The aim is to absorb forces as evenly as possible and to avoid internal stresses in the laminate.
A proven method is a symmetrical lay-up:
- Laminate the first layer in the 0° direction.
- Place the second layer at 45°.
- Align the third layer at 90°.
- For additional layers, continue in mirrored order, for example 90°, 45°, 0°.
This symmetrical laminate lay-up reduces distortion and internal stresses. Especially for larger surfaces, moulds and structurally loaded components, fibre orientation is an important quality factor.
Applications
Typical Applications of Woven Glass Fabric
Woven glass fabric is used wherever fibre layers need to be built up in a controlled way. It is suitable for small repairs as well as technical laminates with defined fibre orientation.
- Boat building and boat repair: for strong GRP laminates exposed to water.
- Mould making: for robust moulds with controlled laminate structure.
- Model making: for lightweight and strong components.
- Vehicle and body repairs: for clean reinforcement and repair layers.
- GRP repairs: as an alternative or addition to chopped strand mat.
Buying Guide
What to Consider When Buying Woven Glass Fabric
When buying woven glass fabric, the most important factors are weave type, fabric weight, component geometry and resin system. Plain weave may be suitable for simple surfaces. For curves, edges and more complex components, twill or satin weaves are often easier to process.
Find the Right Material for Your Laminate
Choose woven glass fabric, resin system and accessories to match your project. Fiberglas Discount offers materials for repair, mould making, boat building and professional GRP processing.
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FAQ
Frequently Asked Questions About Woven Glass Fabric
What is the difference between woven glass fabric and chopped strand mat?
Woven glass fabric is woven and has an ordered fibre structure. Chopped strand mat consists of randomly arranged fibres held together by a binder. Woven fabric allows more controlled fibre orientation, while chopped strand mat is especially easy to process with polyester resin.
Can woven glass fabric be processed with epoxy resin?
Yes. Woven glass fabric is very suitable for epoxy resin. This combination is often used for high-quality laminates, boat building, repairs and components exposed to water.
Can woven glass fabric be processed with polyester resin?
Yes. Woven glass fabric can also be processed with polyester resin. Proper wet-out of the fabric and compliance with the resin manufacturer's instructions are important.
Which weave type is best?
That depends on the component. Plain weave is very dimensionally stable and good for simple shapes. Twill weave is easier to drape. Satin weave is especially suitable for complex geometries.
Why is a symmetrical lay-up important?
A symmetrical lay-up reduces internal stresses and distortion. Especially for larger or load-bearing laminates, it improves component quality.
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