1. Mix Part A and Part B components according to recommended weight ratios. If power equipment is to be used, it is generally recommended to keep mixing speed at or below 350 rpm to prevent heat buildup, which can cause loss of working time and premature curing of the rubber. It is recommended that the container be filled to not more than 1/3 the container height to allow sufficient room for expansion during the deaeration procedure.

2. For these products requiring deaeration, place mixed material in a vacuum chamber and exert 29 inches Vacuum on the material. Some products will require that the vacuum be interrupted or "bumped" several times before the material crests and falls by itself. After the material has receded, keep the mixed material under full vacuum for a minimum of 15 minutes. Bleed air slowly into the chamber until atmospheric equilibrium is reached. Remove mixed and vacuumed material from the chamber. The material is now ready for pouring. 

3. Some Bluestar Silicones Aerospace and Industrial products have a very long mixed pot life. Storing the mixture in a tightly sealed container at 0°F (-18°C) may extend the pot life even longer. Care should be taken when using this method to prevent moisture from condensing on the inside of cold containers and contaminating the mixture.

BLUESIL V-622 A/B KIT may be stored for up to 9 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


BLUESIL V-622 is a black, two component addition cure, flowable silicone aerospace sealant. It is specifically designed for, and qualified to, Pratt & Whitney Specification PWA 407 for use as abradable air seals for compressor blades of jet engines. BLUESIL V-622 imparts high thermal stability, good machinability, long work time, and low density. It is also designed to achieve optimum properties at the specified elevated temperature cure schedule.

Kit Matching: BLUESILV-622 is kit matched when manufactured. This product should be processed using the specific matched Part A and Part B units supplied with the kit. Using a different lot of Part A or Part B may affect the properties of the product.


2 Part RTV

  • Abradable air seal for the compressor blades of jet engines

Asia Pacific;Europe Middle East Africa;Central and South America;North America




Viscosity2400MonocompASTM D 2196Poise
Hardness65MonocompASTM D 2240sh.A
Specific Gravity0.73MonocompASTM D 792
Elongation157.5MonocompASTM D 412%
Tensile strength262.5MonocompASTM D 412psi