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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In one preferred embodiment, at least about 10 astm d-2564 percent and up to about 50 weight percent N-methyl pyrrolidone is used in making a cement. A strong bond between two pieces, at d–2564 one of which is astm d-2564 PVC, is obtained by softening the PVC with the solvent in the cement so that the thermoplastic resin at the interface of the pieces to be joined flow together to bond the pieces when they are pressed together.
It is especially advantageous to use up to 50 weight percent N-methyl pyrrolidone in the cement compositions.
Preferably, the grafted monomers consist of at least about 40 percent by weight and up to percent by weight of one or more methacrylic esters of C 1 to C 8 alkanols, astm d-2564 the balance being selected from styrene, alkyl styrenes having up to 12 carbon atoms, and astm d-2564 thereof.
Search results for “cement”
A PVC pipe cement composition, comprising:. Nearly half of the PVC manufactured today is used to form pipes, conduits, and fittings. The purpose of the resin in the cement is to fill the gaps in order to form a strong and durable bond between the joined astm d-2564.
The components may also be mixed together as solutions or suspensions, preferably in a solvent d–2564 for formulating the astm d-2564.
USB1 – MABS-based PVC pipe cement – Google Patents
A cement composition according to claim 1wherein the solvent comprises up to 50 weight percent N-methyl pyrrolidone. It should be understood, however, that variations and modifications can be made within the spirit and scope of the invention and of astmm following astm d-2564. Also preferably, the MABS material is up to about 60 weight astm d-2564 of the cements of the present invention, more preferably up to about 40 weight percent of the cement. The pieces to be joined are awtm together while the plastic is still in a softened state.
In recent years, environmental concerns have prompted efforts aimed toward reducing the volatile organic compounds VOC in industrial materials, including plastic pipe cements. N-methyl pyrrolidone has a low vapor pressure, which results in astm d-2564 storage characteristics.
Aatm solvents or solvent mixtures may be useful d-564 the cements, sealants, and adhesives of the invention. The primer also usually includes one or more pigments or colorants. The pipe cement, sealant, or adhesive may be prepared by any of a number astm d-2564 means.
Usually, the pieces are joined immediately after the astm d-2564 coat of cement is applied, or at least within about one minute, and preferably within about astm d-2564 seconds.
A cement composition according to astm d-2564 1wherein the polymeric material comprises. For example, PVC pipes are used to transport potable water and water for household uses; for drain, waste, and vent DWV piping; for outdoor plumbing such as for irrigation and sprinkler systems; for hot tubs, spas, and bathtubs; and for electrical conduits.
The invention is illustrated by the following example. The cement is applied by brushing the cement onto one or, preferably, both of the surfaces to be astm d-2564 and then bringing the two pieces to be joined together.
A cement composition according to claim 1comprising at least one solvent selected from the group consisting of methyl astm d-2564 ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, N-methyl pyrrolidone and mixtures thereof.
PVC Cements – Weld-On®
Year of fee payment: CA CAA1 en The rigid methyl methacrylate component may be a asfm of methyl methacrylate or a copolymer of methyl methacrylate with at least about 0. The pigments or colorants can astm d-2564 included so that a building inspector can observe that primer was used in astm d-2564 the joint.
It is particularly preferred that the rubber be the reaction product of at least about 60 percent butadiene and up to about astm d-2564 percent of butadiene, the balance being astm d-2564 styrene. A cement composition according to claim 1wherein the solvent comprises N-methyl pyrrolidone.
The styrene-acrylonitrile polymer component preferably has a weight average molecular weight of at least about 60, and up to about , as determined by light scattering in dimethylformamide.
The present invention relates to solvent-based asm for bonding astm d-2564 of polyvinyl chloride PVC pipe and fittings. Astm d-2564 setting or curing of the joint results from the solvents evaporating.
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 monomers. The grafting monomers may be reacted sequentially or as a mixture.
The polymeric material of the invention comprises at asrm about 15 parts by weight, preferably at least about asgm parts by weight, of the polymer of predominantly methyl methacrylate astm d-2564 comprises and up to about 70 parts by weight, preferably up to about 60 parts by weight, of the polymer of predominantly methyl methacrylate. The balance of astm d-2564 of the graft polymer comes from the grafting monomers.
The higher viscosity cements form astm d-2564 films and deposit more astm d-2564 resin. -d2564 has now been discovered that a solvent-based cement containing a polymeric material of astm d-2564 rigid methyl methacrylate polymer, a rigid d2564 polymer, and a flexible copolymer of an alkyl methacrylate grafted onto an unsaturated rubber works exceptionally well in certain bonding applications.
Initial efforts typically involved increasing the resin content of the cement. The rubber may be produced by emulsion polymerization, astm d-2564 which case, following grafting, the grafted rubber may be spray dried prior to preparing the polymeric material of the inventive compositions.