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Caulk (also known as caulking and calking) [1] is a material used to seal joints or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on wooden boats or ships. Cast iron sewerage pipes were formerly caulked in a similar way.
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 ...
Two-part silicones use moisture in the second component as well as a cross-linker such as active alkoxy to cure the silicone in a process called condensation curing. Two-part silicones can also be platinum catalyzed in a "addition" reaction. [3] Other reactive species to facilitate cross-linking include acetoxy, amine, octoate, and ketoxime. [4]
Butyl acrylate is of low acute toxicity with an LD 50 (rat) of 3143 mg/kg. [4]In rodent models, butyl acrylate is metabolized by carboxylesterase or reactions with glutathione; this detoxification produces acrylic acid, butanol, and mercapturic acid waste, which are excreted.
Overall, the postform countertop is the most economical countertop on the market, and has the broadest selection of surface material to choose from. Surfaces can be either a solid color, or a pattern, and textures range from a satin furniture finish to a heavily textured stone or pebbled appearance to a high gloss resolution.
Formica kitchen countertop Formica laminate was invented in 1912 by Daniel J. O'Conor and Herbert A. Faber, while they were working at Westinghouse , resulting in a patent filing on 1 February 1913. [ 1 ] [ 2 ] U.S. Patent No. 1,284,432 was granted on 12 November 1918. [ 3 ]
A replica xylospongium (sponge on a stick) Ancient Roman latrines in Ostia Antica The xylospongium or tersorium, also known as a "sponge on a stick", was a utensil found in ancient Roman latrines, consisting of a wooden stick (Greek: ξύλον, xylon) with a sea sponge (Greek: σπόγγος, spongos) fixed at one end.
Bath fizzies are material products designed to effervesce in bathwater. They come in the form of amorphous grains of homogeneous mixture, packaged in a box, jar, or envelope; single-use envelopes of mixed powders; and solid boluses of homogeneous or inhomogeneous mixture called bath bombs. Bath fizzies are a form of bath salts in that the ...
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