We offer a comprehensive range of treatments for adhesion of aramid, glass, nylon, polyester, silica and ceramic fabric to peroxide curing rubbers – the most common of which are silicone VMQ rubber and peroxide EPDM, FKM and NBR.
All our treatments are water based and replace traditional solvent systems. Our water based systems give excellent adhesion and have a long shelf life – normally 6 months – for easy factory storage and production. Compotex applies the peroxide adhesives on to the textile, then our customers calendar or lay up the textile with the peroxide curing rubber.
We use many different peroxide technologies, including silane technology, and match fabric and rubber specifications to the peroxide bonding needed. At its best, the adhesion strength of our peroxide treatments are stronger than the breading strength of the rubber, so the peroxide bond is not the weak point in the manufactured part.
We have more information here for adhesion to the sulphur curing rubbers and our RFL bonding systems.
Here are some examples of the range of peroxide bonding Compotex do.
Silane dipped fabric
Silane treatments – including the Momentive Silquest A174NT – give excellent adhesion to meta-aramids and can also be used with polyester, glass, ceramic and silica fabrics. The silane solution is carefully prepared and used quickly due to its short shelf life. The finished silane dipped fabric is fully stable with a long shelf life.
Silane bonding is water resistant and gives an excellent bond strength in wet conditions.
Silane treatments can be used in many product applications, but the silane technology is particularly good for meta-aramid fabrics bonding to peroxide curing silicone rubber. One of the most common applications is high temperature silicone hoses, where the meta-aramid fabric provides the strength, the fire resistance and the high temperature performance.
Silanes can also be used for polyester and glass adhesion to silicone rubber. For this combination, customers have a choice between two Compotex bonding solutions, the silane technology and the Compotex PS technology.
| Aramid Fabrics | Rubber | Compotex Specification |
|---|---|---|
| Meta-Aramid | peroxide Silicone | PA115 |
Para-Aramid to peroxide EPDM
We offer a special treatment for para-aramid fabric for adhesion to peroxide curing rubber. This complex peroxide bonding technology is especially appropriate for high tensile peroxide rubbers like EPDM as well as peroxide NBR and FKM.
Para-aramid fabrics do not bond easily to peroxide rubbers, so the peroxide technology used by Compotex involves a preparation dip for the p-aramid fabric followed by a top dip coat.
EPDM is particularly difficult to bond to on account of its chemical inactivity. This peroxide bonding process offers customers a special opportunity to reinforce EPDM rubber with a high performance technical fabric. The bond between the aramid and the EPDM is good, which gives a dynamic finished part a long shelf life.
Because aramid fabrics are high performance, the peroxide coating process is advanced technology, giving high performance results.
| Aramid Fabrics | Rubber | Compotex Specification |
|---|---|---|
| Para-Aramid | peroxide EPDM | PG01 R520-18 |
Polyester and Glass to Silicone Rubber
Compotex has been a pioneer in the development of water-based alternatives to solvent priming for silicone VMQ rubber, and we have developed and improved our priming technology over the last 20 years.
To reinforce silicone VMQ rubber compounds it is common to use polyester or glass fabrics. We recommend the Compotex PS bonding system. The primed fabric has a long shelf life of at least one year, and is easy to use.
Used for airframe seals and in other silicone rubber parts, the PS peroxide technology is successfully used on polyester, glass, silica and ceramic fabrics. The peroxide dipped fabric is then calendered or coated with silicone rubber. On curing, a chemical bond if formed between the fabric and the rubber, making a strong composite part.
The PS system is especially formulated for polyester and glass fabrics. Silane bonding can also be used. The PS system is not recommended for meta-aramid fabrics – in this case, we would recommend silane dipped fabric.
| Woven and Knitted Fabrics | Rubber | Compotex Specification |
|---|---|---|
| Glass, Silica, Ceramic and Polyester | peroxide Silicone | PS15 |
Nylon to peroxide rubber
Nylon (polyamide) is widely used for rubber reinforcement. There are two bonding technologies for nylon fabric, RFL for sulphur curing rubber like Natural and SBR, Neoprene and Nitrile rubber, and peroxide bonding for the peroxide curing rubbers like EPDM, FKM and NBR.
This bonding technology opens up new possibilities for our customers. Solvent coating has traditionally been used for bonding to difficult compounds. This new bonding technology gives companies the opportunity to move away from solvents when using peroxide rubbers like EPDM, FKM and NBR.
The Compotex water based peroxide technology has a long shelf life, commonly 12 months, and provides new opportunities in the manufacture of specialist peroxide curing rubber parts.
| Nylon Fabrics | Rubber | Compotex Specification |
|---|---|---|
| peroxide EPDM | R520-18 |
