有,我查了一下,你可以上自家看一下: ------------------------------------------------------------------------- National Institute of Standards & Technology Certificate of Analysis Standard Reference Material® 2490 Non-Newtonian Polymer Solution for Rheological Measurements Polyisobutylene dissolved in 2,6,10,14-Tetramethylpentadecane --------------------------------------------------------------------------------- This NIST certificate is using Anton Paar Rheometer for OSC testing. |