Technical

A-A-59178 Supersede Announcement   [PDF 101KB]

The military standard for the MS25171C, dated May 19, 1959 was replaced by A-A-59178A.

A-A-59178A Superseding A-A-59178   [PDF 61KB]

Document A-A-59178A is the current Commercial Item Description dated 12Oct2004.

A-A-59588A Commercial Item Description Silicone Rubber   [PDF 148KB]

This is the current Commercial Item Description for various grades of Silicone Rubber.

Specifications Reference Tables   [PDF 292KB]

The specification tables are for common standards such as Military specifications (Mil specs), AMS, UL Flammability, NEMA Enclosure and ASTM specifications. This specification list is for reference purposes only; refer to the actual specification for specific details.

Durometer   [PDF 174KB]

A visual comparison of the Shore OO, Shore A and Shore D standards for hardness.

Glossary of Elastomeric Terms   [PDF 399KB]

An alphabetical list of terms and their definitions related to the rubber industry.

Elastomer Library   [PDF 375KB]

A table listing a selection of elastomeric raw materials that C&M Rubber Co. is currently or have used in the past.  The table lists their physical, chemical and performance characteristics.  This document is intended to be used as a reference starting point for potential raw material selection. 

Properties of Common Elastomers   [PDF 164KB]

A table comparing the physical properties  of Natural Rubber (NR), Styrene Butadiene (SBR), Butyl (IIR), Ethylene Propylene (EPDM), Neoprene (CR), Nitrile (NBR), Silicone (VMQ/Si), Flurocarbon (FKM), Fluro Silicone (FVMQ) and Urethane (AU).

Elastomer Compatibility Chart   [PDF 284KB]

A table rating the compatibility of Natural Rubber (NR), Styrene Butadiene (SBR), Butyl (IIR), Ethylene Propylene (EPDM), Neoprene (CR), Nitrile (NBR), Silicone (VMQ/Si), Flurocarbon (FKM), Fluro Silicone (FVMQ) and Urethane (AU) with an alphabetical list of chemicals.

RMA Dimensional Tolerances for Elastomers   [PDF 371KB]

 The Rubber Manufacturers Association (RMA) has developed tolerance tables with ranges to provide communication between user and provider across a wide range of industries, from precision aerospace electronic components to open-tolerance products for consumer goods. These tolerance designations relate to the variability inherent in processing molded rubber parts and are referred to as RMA A2 "Precision" and RMA A3 "Commercial" dimensional tolerance designations.

RMA Dimensional Tolerance Tables-Silicone    [PDF 344KB]

 The RMA tolerances listed in this bulletin are industry standard tolerances for silicone molding. To ensure repeatability, consistent manufacturability and affordable part cost, you should consider using the maximum possible tolerance when designing your part.

Rubber Shelf Life   [PDF 210KB]

A table comparing the shelf life of various elastomers in years.

Compression Molding   [PDF 446KB]

Compression molding is the most basic process of the three methods used to mold silicone or other elastomer parts.

Transfer Molding   [PDF 444KB]

Transfer molding uses a “plunger and cylinder” delivery system to control the flow of the elastomer through small holes or “sprues” located in the middle transfer plate.