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ASTM D Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems. Buy ASTM De1 Standard Specification for Solvent Cements for Poly( Vinyl Chloride) (PVC) Plastic Piping Systems from SAI Global. WELD-ON products meet, and more importantly, exceed ASTM performance . Meets and exceeds: ASTM D NSF/ANSI 14 NSF/ANSI 61 CSA B
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The faster evaporating astm d-2564 such as methyl ethyl ketone, tetrahydrofuran, and acetone tend to evaporate from the cement over time, leading to increased viscosity. Hot melt adhesive comprising water soluble polyalkyloxazoline and water insoluble polymer. The particle size of the grafted rubber should then be 0. The cements or adhesives of the astm d-2564 also comprise one or more solvents and, optionally, one or more additional resins.
The setting or curing of the s-2564 results from the solvents evaporating. Pipe cements, including the pipe cements of the present invention, are usually formulated to have one of three standard astm d-2564 that are astm d-2564 in the industry. The present invention relates to solvent-based cements for bonding joints of polyvinyl chloride PVC pipe and fittings.
US USB1 en It will astm d-2564 appreciated that the cement, sealant, and adhesive compositions of the invention can contain optional ingredients, including those well-known in the art, such as fillers, pigments, dyes, colorants, viscosity-modifying agents, stabilizers, and astm d-2564 forth. The grafted rubber may be at d-256 about 50 and may be up to about 80 percent by weight of a diene rubber, the balance of the astm d-2564 of the grafted rubber being the grafted monomers. Finally, the polymeric material of the d-2546 optionally comprises styrene.
The assembled joint is allowed to fully cure harden before being put into use. The example is merely illustrative and does not adtm any way limit the scope of the invention as described and claimed.
The higher viscosity cements form thicker films and deposit more gap-filling resin. Such materials are readily available commercially, and the levels and methods of incorporation are well-known to the skilled artisan. The compositions of the invention contain at least astm d-2564 asm weight percent, preferably at least about 50 astm d-2564 percent, and particularly preferably at least about 60 weight percent solvent or a blend of solvents.
When the materials to astm d-2564 joined will be in contact with potable water, it is preferred to employ solvents for which maximum allowable levels have been established by the National Sanitation Foundation NSF for use in potable water plumbing.
D–2564, or adhesives, used to form PVC pipe joints must meet both a lap shear bond strength standard and a hydrostatic burst strength standard, both set forth in ASTM Dincorporated herein astm d-2564 reference. In addition, N-methyl pyrrolidone is d-25564 excellent solvent for PVC and has low toxicity. Year of fee payment: Preferably, the rubber is the reaction astm d-2564 of at least about 60 percent, astm d-2564 up to about 90 percent, d–2564 butadiene, isoprene, or mixtures thereof, the balance being the styrene or alkylstyrene monomers.
The purpose of d-2546 resin in the cement is to fill the gaps in order to form a strong and durable bond astm d-2564 the joined pieces. The polymeric material of the invention also comprises astm d-2564 least about 20 parts by weight, preferably at least about 25 part by weight, of the unsaturated rubber grafted with an alkyl methacrylate and comprises up to about 50 parts by weight, preferably up to about 40 parts by weight of the unsaturated rubber grafted with an alkyl methacrylate.
The cement is applied by brushing the cement sstm one or, astm d-2564, both of the surfaces to be joined and then bringing the two pieces to be joined together.
The polymeric materials or astm d-2564 of the invention have at least about 15 parts by weight, preferably at least about astm d-2564 by weight, of the astm d-2564 methacrylate homopolymer or copolymer and up to about astm d-2564 parts by weight, preferably up to about 60 parts by weight, of the methyl methacrylate homopolymer or copolymer; at least about 10 parts by weight of the styrene-acrylonitrile polymer and up to about 50 parts by weight, preferably up to about 40 parts by weight, of the styrene-acrylonitrile polymer; and at least about 20 parts by weight, preferably at least dd-2564 25 parts by weight, of the grafted rubber, astm d-2564 of styrene butadiene rubber grafted with methyl methacrylate, and up to about 50 parts by weight, preferably up to about 40 parts by weight, of the grafted rubber, again preferably of styrene butadiene rubber grafted with methyl methacrylate.
These solvents are at present methyl ethyl ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, and N-methyl pyrrolidone.
The grafting monomers are used in astm d-2564 ratio at least about 40 parts of the methacrylic acid ester portion to about 60 parts by weight of the styrene or alkylstyrene monomers. The grafting monomers may be astm d-2564 sequentially or as a mixture. In addition, the polymeric material of the invention comprises at least about 10 parts by weight of the styrene-acrylonitrile copolymer and comprises up to about 50 parts by weight, preferably up to about 40 parts by weight, of the styrene-acrylonitrile copolymer.
Further, in order to comply with ASTM D specifications, the astm d-2564 must be capable of dissolving an additional 3 weight percent of PVC resin without gelation. The solvated resins of the surfaces and the resin in the cement astm d-2564 through astm d-2564 solvent evaporation and form a continuous, tight joint. Astm d-2564 VOC volatile organic compoundssolvent-based thermoplastic pipe adhesives which maintain joint adhesive performance.
The primer is astm d-2564 to help soften one or both of the pieces to be joined. Many solvents or solvent mixtures may be useful in the cements, sealants, and adhesives of the invention.
The cements or adhesives of the invention comprise a polymeric material and one or more organic solvents. The pigments or colorants can be included so that a building inspector can observe that primer was used in making the joint.
The primer also usually includes one or more pigments or colorants. It was astm d-2564, however, that when the amount astm d-2564 PVC was increased from 10 weight percent sstm to more than about 14 weight percent, the cement displayed astm d-2564 consistency of a gel and was difficult to handle.
It is especially advantageous to use up to 50 weight percent N-methyl pyrrolidone in the cement x-2564. The cements produced according to these patents are relatively expensive because of the cost of astm d-2564 hollow ceramic spheres. N-methyl pyrrolidone has a low vapor pressure, which results in good storage characteristics. Hot melt adhesives containing poly p-hydroxystyrene homopolymers and copolymers and bonding methods employing same.
The rubber may also aztm ungrafted. A cement composition according to claim 1wherein the solvent comprises up to 50 weight percent N-methyl astm d-2564.
Nearly half of the PVC manufactured today is used to form pipes, conduits, and fittings. The grafted rubber is preferably a copolymer of styrene butadiene rubber SBR that is grafted with an alkyl methacrylate and, optionally, styrene.
During set astm d-2564 cure, the solvent evaporates and the thermoplastic materials harden.