POLY VINYL CHLORIDE(PVC)

INTRODUCTIONVinyls are based on ethylene monomers in which at least one H is substituted.PVC is a low -cost easily processed plastic of good water resistance and strength-to-weight ratio. It needs stabilizers to prevent decomposition at high processing temperatures and in sunlight. H H | | C C | | H Cl

FAMILYTHERMOPLASTICS

TYPES OF PVCUnplasticized or Rigid PVC

Plasticized or Flexible PVC

TYPES OF PVCFlexible PVC, made by adding some 30-80% plasticizer, finds extremely broad applications Rigid PVC, composition of with little or no plasticizer

General PropertiesAmorphousClearHigh Impact StiffGood Weather abilityChemical resistance excellentSelf extinguishingCheapAbrasion- goodInertWater absorption -low

PROPERTIES

PROPERTIESShrinkage (mm/mm)0.020.05

Characteristic properties areUnplasticized or Rigid PVC High mechanical strength, rigidity and hardness; low cold impact strength in unmodified form; translucent to transparent (depending on method of manufacture); high chemical resistance; self extinguishing after removing ignition source

Characteristic properties arePlasticized or Flexible PVC- Flexibility adjustable over a wide range;- depending on type of plasticizer, toughness very temperature dependent;- translucent to transparent;- chemical resistance is dependent on formulation and very dependent on temperature; - the polymers contain less than 1 ppm vinyl chloride monomer.

Identification of PVC

PROCESSES COMFORTABLE WITHINJECTION MOLDINGEXTRUSIONBLOW MOLDINGCALENDERINGTHERMOFORMINGROTATIONAL MOLDING

GENERAL APPLICATIONSElectrical cordsHandle gripsVacuum cleaner partsShoesPipe fittingsPhonograph recordsChemical containers

APPLICATIONSRelatively new fields are food packaging and conveying applications, medical tubing and blood storage bags, blow molded containers.Lining of chemical vessels, acid-in-salt solution tubing, tubing and gaskets used in chemical industry as well as in the refrigerator industry.

APPLICATIONS

APPLICATIONSafety helmets, gramophone records, lampshades and a range of shoe-varieties.Thermoformed products like signs, displays, toys, games, lighting panels, service trays

APPLICATIONProtective coatings for machines, appliances, cans and closures, decorative metal nettings and fencings, and in the general applications where resistance to corrosion, blushing, attack by weathering and chemicals and abrasion is required.

APPLICATIONBuilding applications for rigid P.V.C. include corrugated building panels, prime window components, weather striping for wooden windows, house sidings, gutter and downspout systems, drain, waste and vent systems, in residential plumbing, staircase railings.

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