PolyPolyvinyl Chloride (PVC) is a synthetic resin made from the polymerization of vinyl chloride. Second only to polyethylene among the plastics in production and consumption. PVC is used in a wide range of domestic and industrial product. PVC is the most economical and versatile material around and hence find its way into products like raincoats, shower curtains, window frames, plumbing, electronics, automobile, siding, blood bags, wire/cable insulation, windshield system and more. The purpose of this App Note is to present the precision achievable with an HMJ Y501 Dual Capillary Relative Viscometer (DSV) system. The analysis conditions are listed below. 

Solvent	THF
Sample Concentration	1 g/dL
Prep Temperature	25C
Dissolution Time	60 Minutes
Analysis Temperature	30C

RSD of DSV data is typically less than 1% and the following data supports that claim.

Samples	IV		Samples	IV
A-1A	1.5398		B-1A	1.6636
A-1B	1.5379		B-1B	1.6636
A-2A	1.5405		B-2A	1.6628
A-2B	1.5406		B-2B	1.6612
Average	1.5397		Average	1.6630
SD	0.0013		SD	0.0014
RSD	0.08%		RSD	0.08%

In addition to the precision of the data demonstrated above, the relative viscometer presents an easy opportunity to automate a particularly laborious task. Automation can range from a simple autosampler system to fully automated Vortex operation.