Inquiry (采购产品): Penetrometer Standards I'm looking for standard samples of waxes, asphalts, etc. that can be traceable to NBS standards to validate in absolute terms penetrometer results **** Hidden Message ***** Steve Gray 4500 Tamko Dr Frederick, MD 21702 USA Company: Tamko E-mail: steve_gray@tamko.com **** Hidden Message ***** steve_gray@tamko.com
