The Rubber Manufacturers Association (RMA) has developed tolerance tables with ranges to provide communication between user and provider across a wide range of industries.

This RMA Tolerance Table is specifically for Cut to Length Unspliced Extrusion profiles. It helps customers and manufacturers to identify and understand critical dimensional requirements, as well as the associated achievability and cost. Projects with closer tolerance demands during the manufacturing process will incur higher costs, so it’s very important to know this information up front.  When your project demands close tolerances please specify in the drawings or in the quote request.

Due to the stretchability and compressibility of silicone rubber, the cut length measurements are hard to calculate. On top of this, temperature plays a key role in the amount of stretch that is achievable so it becomes necessary to allow the extruded product to fall back to room temperature before an accurate measurement can be taken. 

Tolerances are for outside diameters (O.D.), inside diameters (I.D.), wall thickness, width, height, and general cross-sectional dimensions or extrusions.

Keep in mind that these are standard tolerances, but custom tolerances are always available to better fit your needs.