ASTM D 5670 - 95 (Reapproved 2014) Standard Test Method for Rubber - Determination of Residual Unsaturation in Hydrogenated Nitrile Rubber (HNBR) by Infrared Spectrophotometry

Current edition approved Aug. 1, 2014. Published November 2014. Originally approved in 1995. Last previous edition approved in 2009 as D5670 – 95 (2009). — 5 p.
This test method covers the percentage of residual unsaturation (double bonds in unhydrogenated butadiene) in hydrogenated nitrile rubber and is based on infrared examination of rubber films cast from solution.
This test method is applicable to all grades of hydrogenated nitrile rubber in the raw state.
This test method assumes that specimens and infrared spectra are prepared and analyzed by experienced personnel and that the equipment is operated according to the manufacturer’s direction for optimum performance. No details for operation of infrared spectrophotometers are included in this test method.
Since it is customary in infrared spectrophotometry to use wavenumbers (cm−1) rather than Hertz (Hz), the unit for frequency in the SI system, the former is employed throughout this test method.