Rigid vinyl

RigidPoly(vinylchloride) Foam. The techniques that have been used to produce rigid vinyl foams are similar to those for the manufacture of flexible PVC foams. The two processes that have reached commercial importance for the manufacture of rigid vinyl foams (246) are the Dynamit-Nobel extmsion process and the Kleber-Colombes Polyplastique process for producing cross-linked grafted PVC foams from isocyanate-modified PVC in a two-stage mol ding process. 

Rigid vinyl foams ia constmction markets have grown substantially due to improved techniques to manufacture articles with controlled densities and smooth outer surfaces. Wood mol ding substitute for door frames and other wood products is an area that has grown. Rigid vinyl foams are also used ia the manufacture of pipes and wines as resia extenders and ia sidings and wiadows as the replacement of wood or wood substitutes. 

Dimensional stability There is plastics with very good dimensional stability, and they are suitable where some age and environmental dimensional changes are permissible. These materials include polyphenylene oxide, polysulfone, phenoxy, mineral-filled phenolic, diallyl phthalate, epoxy, rigid vinyl, styrene, and various RPs. Such products will gain from an after-bake for dimensional stabilization. Glass fillers will improve the dimensional stability of all plastics. 

Dimension Rigid Vinyl (PVC) Polystyrene ABS Polypropylene (PVC) Polyethylene... 

Vynex Rigid vinyl sheeting Nixon-Baldwin Chemicals... 

Suitable Plastics Acrylics, polystyrenes, cellulose acetates, cellulose buy rates, ionomers, rigid vinyls, polycarbonates, and medium-impact styrenes. 

Property Summary Acrylics recommended for general-purpose applications, especially for optical decorative, and outdoor use. In sheet stock, cast acrylic has greater strength and transparency extruded acrylic costs less (especially in thin members), and has better formability. Polycarbonates for maximum strength, as in explosion shields. Butyrates for excellent impact resistance, and deep formability. Vinyls for maximum formability and printability. Acetates and vinyls for flexible glazing and guards. Medium-impact styrene and rigid vinyls for lowest-cost molded transparent parts. 

ORGANOTIN COMPOUNDS. A family of alky l tin compounds widely used as stabilizers for plastics, especially rigid vinyl polymers used as piping, construction aids, and cellular structures. Some have catalytic properties. They include bntyl tim trichloride, clibntyltin oxide, etc., and various methyldn compounds. They are both liquids and solids. 

The outstanding characteristics of these rigid vinyls are chemical, solvent and water resistance resistance to weathering when properly stabilized, therefore permitting long-term outdoor exposure and low cost. Abrasion and impact resistance ate satisfactory. 

Having considered these systems, we can now examine the systems AMX, ABX, and ABC, starting with a rigid system. Styrene, whose rigid vinylic group... 

Transparent Boxes. Boxes can be made in translucent or transparent acetate or rigid vinyl film, with creasing by application of heat and welds at the final tear-seal. 

Furane, ionomer, melamine resins, SAN, polysulfone, and rigid vinyl Acetone, methyl ethyl ketone Abrasion. Grit or vapor blast or 100-grit emery cloth followed by solvent degreasing. ... 

The plastic material delivered to the calender must be molten, homogeneous in composition and temperature, and at optimum viscosity for the calendering operation. For rigid vinyl, optimum temperature may be 180-l90°C for flexible vinyl, 10-20°C lower. 

A number of insect species, including corn earworm, Heliothis zea (Boddie), and tobacco budworm, Heliothis virescens (F.), contain and C,g aldehydes (C al and C al) in their pheromone blends (22, 23). The release rate of a C. al would be expected to be higher than that of a Cj al because of the molecular weight difference. A mixture containing 10% n-tetradecanal (CjA°al) in Z)-ll-hexadecenal [(J0-Il-Cj al] was formulated in four laminates, each made from a different type of polymeric membrane as the top and bottom layers vinyl, Mylar -coated vinyl, acrylic, and rigid vinyl film. (The saturated C,.°ol was used as a model because of availability.) The total alaehyde content was approximately 2.3 mg per cnr of laminate 0.7% (of the pheromone weight) of 2,6-di-tert-butyl-4-methylphenol (BHT) was added as an antioxidant. Table II gives the thickness of the polymers. 

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