The purpose of this App Note is to present comparison IV (intrinsic Viscosity) data of an in-house Polyethylene standard vs historical NIST SRM’s. This HMJ-PESTD is important because NIST-1475/6 are no longer commercially available. Therefore, an NIST traceable reference is highly desirable. Also, this HMJ-PESTD was selected to closely match the NIST-1475/6 pair.

Solvent	Decalin + 250 ppm BHT
Sample Concentration	0.1 g/dL
Prep Temperature	135C
Dissolution Time	2 Hours
Analysis Temperature	135C

The following is an overlay of a group of 6 PESTD ViscoGrams. IV data is presented in the Table. 

Sample ID	Measured IV (dL/g)	NIST-1475	NIST-1476
PESTD-1A	1.1384
PESTD-1B	1.1362
PESTD-2A	1.1290​
PESTD-2B	1.1488
PESTD-3A	1.1265
PESTD-3B	1.1403
Average	1.1365	1.0659 dL/g (by HTDSV)	1.2053 dL/g (by HTDSV)
SD	1.1365	1.042 dL/g (NIST COA)	1.180 dL/g (NIST COA)_
RSD	0.71%