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Provides protection from solvent evaporation. The topless plastic screw cap for standard PolyVISC sample vials can be modified by the addition of a scored Mylar® film and rubber seat. In conjuction with an aluminum foil seal, the Mylar and rubber inserts enhance test precision for highly volatile samples by preventing evaporation that can affect the concentration of the polymer solution. The design also helps to reduce toxic and/or corrosive vapors in the AIRBATH by resealing the cap aperture following the test, and the Mylar and rubber inserts wipe the exterior of the viscometer tube as it is withdrawn from the vial, further reducing the risk of cross-contamination when performing multiple sample tests. The solvent-resistant Mylar®/rubber inserts are sold in packages of one dozen each, and can be re-used multiple times with appropriate cleaning and drying procedures. PolyVISC viscometer tubes Two tube types are available for the PolyVISC instrument. The modified Atlantic compound viscometer tube is suitable for most samples. The modified Ubbelohde tube is particularly suited for more volatile samples, and may significantly enhance determinability and repeatability. Contact CANNON Technical Services for order information.
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