Raw Materials


WCCO has worked closely with its rubber vendors to produce exclusive synthetic rubber formulations specifically for our products. Our compound recipes have a high resistance to abrasion and resistance to heat and aging, among many other benefits. However, if our standard compounds don't suit your product application, we have a number of different compound options available or we will work with our vendors to develop a new compound that works for you.

The two main types of fabric are spun fabric and filament fabric.

Spun Fabric


Spun fabric construction can be described as numerous short strands of yarn that are twisted and woven together.

Key Advantage

Spun fabric can either be friction coated or skim coated.  Friction coating is when the calender pressurizes the raw rubber into the fabric, infusing and strengthening the fabric yet not adding to the fabric’s original thickness.   


Low Physical Properties ♦ Few Vendor Sources ♦ Severe Price Fluctuations ♦ Inconsistency of Spun Yarns ♦ Varied Fiber Lengths ♦ Differential of Twist Levels ♦ Variable Shrinkage/Stretch

Filament Fabric


Filament fabric construction can be described as long continuous strands woven together.

Key Disadvantage

Due to the filament fabric structure, it is nearly impossible to friction coat.  The long strands of filament yarn are so tightly woven that rubber can't impregnate the fabric and easily wipes off.

Key Advantages

High Physical Properties ♦ Multiple Vendor Sources ♦ Stable Pricing ♦ Easy to Produce ♦ Consistent Quality

RAPTOR™ Fabric

In the past, friction coating was rare on filament fabric due to its construction.  However, WCCO designed and patented a filament fabric weave that is capable of friction coating, known as RAPTOR™.