ASTM D 5902 - 05 (Reapproved 2015) Standard Test Method for Rubber - Determination of Residual Unsaturation in Hydrogenated Nitrile Rubber (HNBR) by Iodine Value

Current edition approved June 1, 2015. Published September 2015. Originally approved in 1996. Last previous edition approved in 2010 as D5902 – 05 (2010). — 3 p.
This test method covers the Wiijs procedure for the determination of unsaturation (iodine value) in hydrogenated nitrile rubbers.
This test method is applicable only to those hydrogenated nitrile rubbers derived from copolymers of acrylonitrile and butadiene.
Iodine values are reported in centigrams of iodine per gram of HNBR [cg(I2)/g]. Higher iodine values indicate higher levels of unsaturation.
This test method is appropriate for calculating the percent residual unsaturation of hydrogenated nitrile rubber if the iodine value of the base polymer before hydrogenation hasbeen determined.