Thermoset Elastomer Specification System
|Publication Date:||1 June 2014|
This document provides a method/procedure for specifying the properties of vulcanized elastomeric materials (natural rubber or synthetic rubbers, alone or in combination) that are intended for, but not limited to, use in rubber products for automotive applications.
This document covers materials that do not contain any re-use; recycled; or regrind materials unless otherwise agreed to by manufacturer and end user. The use of such materials, including maximum % must be specified using a "Z" suffix.
This classification system covers thermoset High Consistency Elastomers (HCE's) only. Thermoplastic Elastomer (TPE) materials are classified using SAE J2558. Silicone Formed In Place Gasket (FIPG) systems such as Room Temperature Vulcanized (RTV) Silicones, and Liquid Silicone Rubber (LSR) systems are classified using ASTM F 2468.
This classification system is an alternative document to SAE J200.
This document utilizes certain elements of SAE J200, SAE J2236 and SAE J2558 along with new elements to build a line call out without the need for laboratory round robins to generate data for table creation/ modification.
The basis for a line call out for any material using this document includes:
Continuous Upper Temperature Resistance (CUTR)
IRM 903 Oil Volume Change
Requirements and Recommendations
The creator of a line call out, prior to material testing must have a good grasp of the application requirements and elastomeric material principles.
Certain polymer description and physical property characteristics are required in a line call out and are covered in 1.2 and Section 3. Additional physical property characteristics are discretionary based on the needs of the application, and are covered in Section 4.
It is recommended to utilize this document to classify elastomeric materials for specific applications in order to maintain a minimum length line call out.
It is recommended the material manufacturer and the user develop a final line call out for a functioning material based on 30 data points (minimum for statistical analysis) per requirement from 6 different production batch runs minimum for large scale production.
Development of a line call out for low volume/ small scale production in which 6 different production batch runs may not be feasible In these cases development may be based on 20 data points per requirement from at least 1 production batch and 3 laboratory lots (or any combination totaling 4 lots, as long as 1 production lot is included). If using this alternative, it is recommended that each production lot be validated to the full line call out prior to use.
Production batch runs must be prepared using the production intent equipment parameters (type, size, and other compounding parameters).
Test plaques used for physical property evaluations should, as close as possible, mimic the production process, including state of cure.
The format of examples used in each section/subsection lists the basic requirements along with the applicable suffix requirement. The examples shall resemble as close as possible, real life materials. The portion of the example to be defined for each subsection are shown in bold print.