American Society for Testing and Materials (ASTM). Current edition approved Jan. 1, 2008. Published February 2008. Originally
approved in 1997. Last previous edition approved in 2002 as D 6147 – 97 (2002). This standard specifies two methods for determining the
decrease in counterforce exerted by a test specimen of vulcanized rubber or thermoplastic elastomer which has been
compressed at a constant deformation under specified conditions of time and temperature.