Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. 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	60/40, Phenol/Tetrachloroethane
Sample Concentration	1 g/dL
Prep Temperature	25C
Dissolution Time	60 Minutes
Analysis Temperature	19C

The data summary clearly shows the superior precision of the instrument. RSD of DSV data is typically less than 1% and the following data supports that claim.

Samples	IV	Sample	IV	Sample	IV
1A-1	0.4553	2A-1	0.4847	3A-1	0.3943
1A-2	0.4608	2A-1	0.4819	3A-2	0.3944
1B-1	0.4524	2B-1	0.4877	3B-1	0.3952
1B-2	0.4604	2B-2	0.4803	3B-2	0.3959
Average	0.4572	Average	0.4837	Average	0.3950
SD	0.0041	SD	0.0033	SD	0.0008
RSD	0.89%	RSD	0.67%	RSD	0.19%

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.