Feb, 27 2017

3B Certified Silicones in 50, 60, and 70 Durometer



3B Certified Silicones in 50, 60, and 70 Durometer

Important: This article contains new information about SSP's product offerings.

Specialty Silicone Products (SSP) supplies 50, 60, and 70 durometer silicones that meet the full requirements of the A-A-59588 3B specification – with no exceptions for flexural testing. Other suppliers may claim to meet this requirement, but industry-wide compliance has been inconsistent. The 50, 60, and 70 durometer silicones that SSP supplies have been tested and certified to the full A-A-59588 3B specification, which includes DeMattia Flex Test requirements for resistance to cracking. 

The A-A-59588 standard is published by the U.S. General Services Administration (GSA) and contains six alphanumeric classes or sections. Each class specifies multiple material properties, but 3B is one of only two classes with requirements for flex-fatigue resistance. (The other is Class 3A.) Each A-A-59588 class also contains numbered grades (e.g., 50, 60, and 70) that correspond to a silicone’s durometer (Shore A) or hardness. This Certificate of Analysis shows how SSP documents compliance. 

The following sections describe SSP’s 3B certified silicones. These 50, 60, and 70 durometer elastomers are supplied as compression-molded sheets and ready-to-mold compounds. For all three durometers, flex-test results are provided right on the product data sheets. Note that SSP is also developing A-A-59588A, Class 3A materials with high flex-fatigue resistance. 

SSP-200-T: Grade 50, 3B Silicone 

SSP-200T is a 50-durometer elastomer that meets all of the requirements for A-A 59588, Class 3B, Grade 50 silicones. SSP-200T has a maximum flex-resistance of 0.5” and typical values of 0.42” (140,000 cycles). For additional product specifications, download the SSP-200-T data sheet

SSP-392-T: Grade 60, 3B Silicone 

SSP-392-T is a 60-durometer elastomer that meets all of the requirements for A-A-59588, Class 3B, Grade 60 silicones. SSP-392-T has a maximum flex-resistance of 0.5” and typical values of 0.45” (50,000 cycles). For additional product specifications, download the SSP-392-T data sheet

SSP-2521-T: Grade 70, 3B Silicone 

SSP-2521-T is a 70-durometer elastomer that meets all of the requirements for A-A-59588, Class 3B, Grade 70 silicones. SSP-392-T has a maximum flex-resistance of 0.5” and a typical values 0.42” (2500 cycles). For additional product specifications, download the SSP-2521-T data sheet

Ask SSP for 3B Certified Silicones 

Do you need 50, 60, or 70 durometer silicones that meet the full requirements of the A-A-59588 3B specification – with no exceptions for flexural testing? SSP supplies 50, 60, and 70 durometer silicones that are 3B certified. For more information, email Dominic Testo or contact SSP on-line.