The Welch CRVpro8 Chem is effective for freeze drying or concentration of samples using a lyophilizer, including harsh chemicals such as TFA, Acetonitrile, HBr and others. These chemicals quickly attack the vacuum pump oil of unprotected vacuum pumps. CRVpro8 Chem is engineered to better combat the impact of such chemistries.
The oil filtration system uses an alumina element that neutralizes acids and removes solid reaction products from the oil. The system also has a large oil capacity of 1.3 liters that dilutes contaminants that mix with the pump oil during freeze drying runs.
The inside surface of the oil case has a PTFE coating and the outer surface of the pumping module has a black oxide coating. The oil supplied for the pump is Welch Gold Oil (cat. no. 8995G-11) – a double distilled synthetic hydrocarbon oil designed for excellent chemical resistance. The synthetic base stock has no aromatic compounds or sulfur to accelerate varnishing, sludging and carbon build-up when pumps are used to pump corrosives.
The combination of oil filtration, internal surface protection, and synthetic hydrocarbon oil act to slow metal corrosion to extend pump’s service interval compared to unprotected vacuum pumps.