ASTM D 2572-97(R03) Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers
http://www.instrument.com.cn/bbs/download.asp?ID=122070ASTM D 5420-04 Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen by Means of a Striker Impacted by a Falling Weight (Gardner Impact)
http://www.instrument.com.cn/bbs/download.asp?ID=40807手头有ASTM D 5628-96(R01),需要吗?