Molded, fabric reinforced seals are recommended when sealing against pressure differentials greater than 14 psig (1 bar) or to exert clamping/actuating forces greater than normal. Use of fabric reinforcement also adds to the seal’s overall strength and resilience.
Fabrics are integrally molded into each inflatable seal using special processes. Available fabrics vary by profile. As an example, due to Kevlar’s thickness, we are unable to supply this reinforcement in some of the smaller seal profiles.
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| Strength of Typical Industrial Yarns at Elevated Temperatures |
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| Fabric Strength As Compared to Nylon |
Nylon Fabric Reinforcement
A high tenacity yarn that is tough and abrasion resistant. Nylon is the most common fabric used in our inflatable products, because it is strong and pliant which enhances a seal’s dynamic properties.
Dacron® Brand Polyester Fabric Reinforcement
Dacron is another high tenacity, high modulus yarn used primarily when high flexibility is required. Dacron can be used with silicone and organic polymers and is especially effective in applications where heat > 250°F (120°C) is present.
Nomex® Brand Aramid Fabric Reinforcement
Nomex is one step above Dacron in its ability to withstand temperatures and chemicals. Nomex is often used in conjunction with silicone as both materials are able to withstand temperatures > 250°F (120°C).
Kevlar® Brand Aramid Fabric Reinforcement
Kevlar is by far the strongest fabric Pawling EP uses. It is temperature resistant, tough, and has a high modulus. Kevlar can only be used in larger cross sections due to its thickness and its high cost needs to be weighed against the benefits provided.
Dacron®, Nomex®, and Kevlar® are registered trademarks of E. I. du Pont de Nemours and Company or its affiliates. Typical Industrial Yarn Strength chart is also courtesy of E. I. du Pont de Nemours and Company or its affiliates.