Natural rubber, often blended with SBR, remains the most used rubber with textile reinforcement. It is usually reinforced with nylon (polyamide) fabrics. The RFL technology used by Compotex bonds NR / SBR to nylon, activated polyester, cotton, rayon, aramid and vectran fabrics.
We offer a number of specifications for the adhesion of different fabrics to NR / SBR. For the different industries and products, we recommend a range of RFL formulations.
For the very dynamic high-performance parts, high adhesion is required between the textile and the rubber. We recommend RFL dipping with high vinyl pyridine latex content.
If the flexibility of the fabric under dynamic conditions is important, we will propose a specification that gives a more flexible finish on the fabric.
Dip pick-up is also important, and we can tailor the amount of dip on the fabric to your adhesion specification and your other technical requirements.
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We offer a number of specifications for the adhesion of different fabrics to NR / SBR. For the different industries and products we recommend a range of RFL formulations.
Textiles for Natural Rubber and SBR Example
We were asked by a textile company whether we could RFL dip one of their specialist industrial fabrics for Natural Rubber pump seals.
We were instructed on two important characteristics that we needed to achieve:
- The adhesion should be good and the fatigue performance of the bond should outlast the degradation of the rubber over the lifetime of the part.
- The dip shouldn’t stiffen the fabric too much. This was important for the flex performance of the part – its elongation and stretch – so the reinforced rubber wasn’t too stiff for its optimum performance.
We recommended a trial with a dip that gave a softer finish, by formulating the dip ratio between resorcinol, formaldehyde and latex to optimise the customer’s requirements.
We are able to undertake customer-specific dipping because of our many versatile machines, our ability to make small batches of dip and our willingness to do small production runs for our customers.
The production trial was successful and the dip specification agreed.