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Depending on the method, a varying amount of chlorine is introduced into the polymer allowing for a measured way to fine-tune the final properties. The chlorine content may vary from manufacturer to manufacturer; the base can be as low as PVC 56.7% to as high as 74% by mass, although most commercial resins have chlorine content from 63% to 69%.
In a fire, PVC can form hydrogen chloride fumes; the chlorine serves to scavenge free radicals, making PVC-coated wires fire retardant. While hydrogen chloride fumes can also pose a health hazard in their own right, it dissolves in moisture and breaks down onto surfaces, particularly in areas where the air is cool enough to breathe, so would ...
Recycling codes on products. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process.The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
The most commonly used material is a heavy weight vinyl known as PVC (polyvinyl chloride). The weights of the different banner substrates range from as light as 9 ounces per square yard (310 g/m 2) to as heavy as 22 oz/sq yd (750 g/m 2), and may be double- or single-sided.
The Axiall Corporation is a manufacturer and marketer of chlorovinyls (caustic soda, chlorine, VCM, EDC, PVC resins, PVC rigid and flexible compounds) and aromatics (acetone, cumene, phenol). [1] With the acquisition of Royal Group Technologies the company is now also a major producer of building materials ranging from piping and siding to ...
It is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC). Vinyl chloride is a colourless flammable gas that has a sweet odor and is carcinogenic . Vinyl chloride monomer is among the top twenty largest petrochemicals ( petroleum -derived chemicals) in world production. [ 2 ]
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PVC, used extensively in sewage pipes, is only useful because of plasticizers. [ 1 ] A plasticizer ( UK : plasticiser ) is a substance that is added to a material to make it softer and more flexible, to increase its plasticity , to decrease its viscosity , and/or to decrease friction during its handling in manufacture.