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Perfluoro(2-methyl-3-pentanone) is a fluorinated ketone with the structural formula CF 3 CF 2 C(=O)CF(CF 3) 2, a fully-fluorinated analog of ethyl isopropyl ketone.It is used as an electronics coolant liquid and fire protection fluid sold commercially by 3M under brand names such as Novec 1230, Novec 649, and FK-5-1-12.
In 2001 the company was acquired by Tyco International, [7] and in 2011 it changed its name from Scott Health and Safety to Scott Safety. [8] In 2014 Scott Safety acquired the gas and flame protection company Industrial Safety Technologies for $329.5 million. [5] In 2017, 3M entered negotiations to acquire Scott Safety for $2 billion. [9]
Sealant is a substance used to block the passage of fluids through openings in materials, [1] a type of mechanical seal. In building construction sealant is sometimes synonymous with caulk (especially if acrylic latex or polyurethane based) [2] and also serve the purposes of blocking dust, sound and heat transmission. Sealants may be weak or ...
C 8 fluorinated urethane constituent [3] that has later been replaced by a C 4 alternative. 3M reformulated Scotchgard and since June 2003 has replaced perfluorooctanesulfonic acid (PFOS) with perfluorobutanesulfonic acid (PFBS). [4] PFBS has a much shorter half-life in people than PFOS (a little over one month vs. 5.4 years).
A firestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly. Firestops are designed to maintain the fire-resistance rating of a wall or floor assembly intended to impede the spread of fire and smoke. [1]
The gasses cannot pass through this backer rod and can deform, weaken, and even cause holes (leaks) in the caulk or sealant as it escapes. Out-gassing is the reason that open-cell backer rod was developed. [7] Open-cell foam is porous so it will let gasses through which could otherwise cause blistering of the caulk or sealant.
Silicone caulk can be used as a basic sealant against water and air penetration. In organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (−O−R 2 Si−O−SiR 2 −, where R = organic group). They are typically colorless oils or rubber-like substances. Silicones are used in ...