Heat Protection

Heat Protection

Our coatings and dips are formulated with dispersions of vermiculite, silica and graphite

We provide an extensive range of glass and silica fabrics for high temperature heat protection. Our coatings and dips are formulated with dispersions of vermiculite, silica and graphite.

Glass fabrics have a temperature maximum of 550˚C. On dipping with dispersions of silica and graphite these fabrics provide protection at continuous temperatures of 700˚C. Vermiculite dipped glass fabric can provide protection at even higher temperatures.

Silica fabrics resist temperatures up to 1000˚C. The addition of vermiculite coating gives resistance to higher temperatures for a short period. Graphite dipped silica fabric improves the dynamic and abrasion resistance and improves the longevity of the part in some applications.

Weavelocking of glass fabrics using polymer formulations locks the fibres together in the fabric. The fabric does not fray on cutting and is more easily fabricated into parts. The pick-up concentration can be varied, giving the right stiffness and handleability for the customer’s application. Weavelocking on its own does not increase the temperature rating of the glass fabric.

Heat protection coating and dips – Compotex
Vermiculite – Compotex technologies


Vermiculite is a naturally occurring mineral, with excellent heat protection, fire protection and insulation properties. We use Dupré Micashield for our vermiculite dispersion which we then dip with glass and silica fabrics. The Compotex dipped fabric has a golden colour.

The Compotex production process disperses the Micashield mineral fibres through the fabric. We have dedicated production machinery for vermiculite dipping which gives us the versatility and expertise to coat vermiculite dispersion on a wide range of fabrics. Our standard range of glass and silica dipped vermiculite covers weights from 400 g/sqm to 2000 g/sqm.

For temperatures above 700˚C, we recommend vermiculite dipped fabric. Vermiculite is the only recommended coating for resisting short exceptional temperatures, for example with splashes of molten metal or welding sparks. The dipped fabric has good abrasion resistance, low smoke emissions and good insulation properties.

Vermiculite dipped glass fabric is commonly used for protecting people and machinery in factories.


To improve the high temperature performance of glass fabrics, we offer silica based dips. We have many different specifications for a very wide range of fabrics and uses.

Our silica dips raise the performance temperature of the textile to a maximum continuous operating temperature of 700˚C.

Our range of fabrics and dip specifications using silica is considerable. What doesn’t change is the silica content that gives the fabric its 700˚C rating. Adding silica to glass fabrics, and getting good impregnation into the glass fibres results in a stiffer product. Using our versatile manufacturing capability, we can adjust the stiffness and flexibility of the fabric to suit each customer’s requirements.

The natural colour of a silica dipped fabric is white. Many customers prefer some light colour in their fabric and we offer this as standard.

The weight range for silica fabrics is from 400g/sqm to 1500g/sqm. The fabric width we offer is up to 1750mm.

Silica – Compotex technologies
Graphite – Compotex technologies


For applications requiring some dynamic movement and flexibility and operating at high temperatures – usually well above 250˚C – graphite dipped glass or silica fabrics are recommended. At this temperature, other fabrics like nylon and polyester with excellent flex properties melt or degrade.

Our graphite dipping lubricates the fabric as well as providing additional heat protection. Both glass and silica fabrics are improved with graphite. The addition of graphite to silica fabric improves the characteristics of the silica fabric at high temperature, improving its durability and lifetime in these heat intensive parts. The maximum operating temperature for glass is up to 700˚C, for silica it is over 1000˚C.

Compotex graphite dip specifications are carefully formulated so the graphite bonds into the fabric fibres and the fine black graphite powder is held into the fabric surface. For flexible parts it is important that the graphite lubricates deep into the fabric and minimises the fibre break and fabric failure that would take place without the graphite.


For heat protection applications that only need temperature resistance up to a maximum of 550˚C, the characteristics of glass fibre are sufficient. However, the cutting and processing of loomstate glass fabrics produces airborne fibres which require constant extraction.

Weavelocking is recommended for these applications. Compotex weavelocking is a fire retardant polymer dip that binds the fibres together. When a weavelocked fabric is cut or punched, the fibres cut cleanly and the amount of airborne fibres is small.

Our versatile and advanced manufacturing offers a wide range of weavelocking options, including colour and stiffness.

Glass fabrics can be coloured to your specification. We have particular expertise in the black weavelocking of light fabrics.

Every customer is looking for a stiffness that fits their production process, whether as flexible as possible or very stiff. Our versatile production capability means that we can respond to your requests quickly and effectively.

Normal fabric weights are from 100g/sqm to 1500g/sqm and maximum width is 1750mm.

Weavelock – Compotex technologies