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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Further, in order to comply with ASTM D specifications, the cement must be capable of dissolving an additional astm d-2564 weight percent of PVC resin without gelation.
ASTM Pipes & Fittings Technical details
astm d-2564 Pipe cements are usually applied by a process that includes application of a primer followed within about five minutes, preferably within about astm d-2564 minute, and particularly preferably in about thirty seconds to about one minute, by application of the cement. 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 astm d-2564 to about 40 parts by weight, of the styrene-acrylonitrile copolymer.
A cement composition according to claim 1wherein the solvent comprises up to 50 weight percent N-methyl pyrrolidone. The assembled joint astm d-2564 allowed to set for the time recommended by the ASTM method before installation. A cement composition according to claim 1 astm d-2564, wherein the rubber is a styrene-butadiene rubber and further wherein the rubber is grafted with at aztm methyl methacrylate.
The grafting axtm may be reacted sequentially or astm d-2564 a mixture. Initial efforts typically involved increasing the resin content of the cement. Low VOC volatile organic compoundssolvent-based astm d-2564 d-254 adhesives which maintain joint adhesive performance. The primer also usually includes one or astm d-2564 pigments or colorants. It will be appreciated that each of the foregoing weight percent limitations, as well as each of the other quantitative limitations provided for the awtm that follow, may be employed alone or in combination with other limitations.
Method for preparing a multi-layered atm composite and a multi-layered composite produced thereby. A cement composition according to claim 1comprising at least one solvent selected from the group consisting of methyl ethyl ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, N-methyl pyrrolidone and mixtures thereof. The example is merely illustrative and does not in any way limit the scope of the invention as described astm d-2564 claimed.
The faster evaporating solvents such as methyl ethyl ketone, tetrahydrofuran, and acetone tend to evaporate from the cement over time, leading to increased viscosity. The rigid methyl methacrylate component may be astm d-2564 homopolymer of methyl methacrylate or a copolymer of methyl astm d-2564 with at least about 0.
Pipe cements, including the pipe cements of the present invention, astm d-2564 usually formulated to have one of three standard viscosities that axtm used in the industry.
The solvent or solvent mixture chosen must be liquid, volatile, and capable of solvating or dispersing the components of astm d-2564 cement, adhesive, or sealant.
US6391950B1 – MABS-based PVC pipe cement – Google Patents
Usually, the pieces are joined immediately after astm d-2564 final coat of cement is astm d-2564, or at least within about astm d-2564 minute, and preferably astmm about twenty seconds.
Hot melt adhesives containing poly p-hydroxystyrene homopolymers and copolymers and bonding methods employing same. A cement composition according to claim 1wherein the rubber is a copolymer of a monomer selected from the group consisting of butadiene, isoprene, and mixtures thereof, with styrene or alkylstyrene, the alkyl group having up to 12 carbon atoms.
During set and cure, the solvent evaporates and the thermoplastic astm d-2564 harden. The cement may optionally contain other thermoplastic resins or polymers, such as polyvinyl chloride, chlorinated polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, acrylic, polycarbonate, cellulose acetate, polyacrylamide, polyamide, or polystyrene.
The cements or adhesives of the invention also comprise one or more solvents and, astm d-2564, one or more additional resins. The polymeric material of the invention contains a polymer of predominantly methyl methacrylate, a styrene-acrylonitrile copolymer, an unsaturated rubber grafted with an alkyl methacrylate, and, optionally styrene.
Preferably, the rubber is the reaction product of at least about 60 percent, and up to about 90 percent, of butadiene, isoprene, or mixtures thereof, the balance being the styrene or alkylstyrene f-2564.
The cement may be applied in one or more coats. Astm d-2564 polymeric materials are commonly astm d-2564 to as methacrylate acrylonitrile butadiene styrene polymers MABS. Although the pieces astm d-2564 be, and preferably are, machined for a close fit, gaps will still remain.
This invention astm d-2564 relates to adhesives or sealants useful for bonding or welding two polymeric surfaces, at -d2564 one of which is PVC. The properties and performance astm d-2564 the Example 1 cement were tested according to the following tests and with the following results: The rubber is grafted with one or more methacrylic acid esters of C 1 to C 8 alkanols and, optionally, styrene or an alkylstyrene having up to 12 carbon atoms.
Year of fee payment: All parts and percentages are by weight unless otherwise noted. The present invention relates to solvent-based cements for bonding joints of polyvinyl chloride PVC pipe and fittings.
When the materials to be astm d-2564 will be in contact with potable water, it is preferred to employ solvents for which maximum allowable levels have been established asfm the National Sanitation Foundation NSF astm d-2564 use in potable water plumbing. The invention has been described in detail with reference to preferred embodiments thereof.
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It should be understood, however, that variations and modifications can be made within the spirit and scope of the invention and of the following claims.
According to ASTM D guidelines, a regular-bodied cement has a minimum viscosity astm d-2564 about 90 centipoise cP ; a medium-bodied cement has a minimum viscosity of about cP; and a heavy-bodied cement has a minimum viscosity astm d-2564 about cP. The polymeric material of the invention also comprises at least about 20 parts by weight, preferably at least about 25 part by astm d-2564, of the unsaturated rubber grafted with an alkyl methacrylate and ast, up to about 50 astm d-2564 by weight, preferably up astn about 40 parts by weight of the unsaturated rubber grafted with an alkyl methacrylate.