Apiezon Grease, Type T is designed more as a medium temperature and stopcock grease and for other general lubrication requirements. It is guaranteed to be silicon free. The vapor pressure is 5x10-9 torr at 20° C. The maximum recommended use temperature if 120° C. This would not be the recommended choice for use in an electron optical column (one should use Type M or Type L). The key features of this product are the following: Medium temperature range (10° C to 120° C), Good sticking power, Low to medium vacuum range, and Non-silicone based. Apiezon T grease is specifically recommended fore sealing and lubrication in medium temperature applications, but not for highly stressed bearings. A high molecular weight polymeric additive gives Apiezon T grease a tenacious consistency and provides extra cushioning between mated surfaces. By absorbing vibrations in equipment, Apiezon T grease is invaluable in fragile glass to glass joints which continually risk fracture. Apiezon T grease is a very tenacious grease conferring excellent cohesive strength. Mated joints when joined together stay together, ensuring an efficient gas tight seal. At its higher operating temperature range, Apiezon T grease exhibits good vacuum properties in the lower to medium vacuum range, while at lower temperatures it can be used in the high vacuum range.