PVC Pipes & Fittings


Click here for pipe dimensions of schedule 40, 80 & 120 as per ASTM-D-1785

All materials and products have some effect on the environment. As a result society must take balanced approach and carefully weigh the environmental impact against the benefits that are derived from a particular material or product.

The three most important raw materials being used by Ori-Plast to produce pipes and fittings are PVC (poly vinyl chloride), CPVC (Chlorinated Poly Vinyl Chloride) and PE (Polyethylene, High and Medium Density), all of which are classified as thermoplastic material, meaning that they can be melted to a liquid and remolded as they return to solid state.

All these materials are produced from crude benzene which is obtained as a by-product during distillation of petroleum. Crude benzene is broken down in a heat cracking process into various hydrocarbons including ethylene which is a colour less gas comprising carbon and hydrogen.

UPVC / RPVC
PVC is produced from ethylene by interacting with chlorine gas (obtained from electrolysis of sodium salt inexhaustibly available in nature) to produce another gas
known as vinyl chloride monomer which is again transformed into poly vinyl chloride by polymerization. It is one of the most important and oldest mass produced polymers and offers the most economical solution when first rate physical properties, chemical resistance and self extinguishing properties are essential at continuous temperatures below 1550 F or 680 C.

PVC plastics are produced by combining PVC resin with various types of additives e.g. stabilizers, lubricants, pigments, fillers, processing aids and plasticizers. The amounts and types of these additives are varied to produce different PVC compounds with properties tailored for specific applications. Plasticizer for example adds flexibility and hence is not added to produce rigid pipes e.g. Plumbing pipes (as per ASTM D 1785) , SWR pipes (as per IS 13592) , Bore Well pipes (as per IS 12818),  Pipes for water supply and agri-irrigation purposes (as per IS 4985) etc. and thus these are often referred as un-plasticized or uPVC.

Ori-Plast’s PVC is characterized by the following properties:
  • Very good chemical and corrosion resistance
  • Proven physiological harmless and therefore suitable for contact with food
  • No influence on drinking water quality
  • Biologically inert and do not support microbial growth
  • High mechanical tensile strength and good impact strength
  • Self extinguishing
  • Secure solvent cementing

PVC PROPERTISE (REFERENCE VALUES)

CHARECTERISTICS TEST STANDARD UNITS VALUES
Density ISO 1183-1 g / cm3 1.38
Yield Stress at 230 C EN ISO 527 - 1 N / mm2 ≥ 52
Tensile E - Modulus at 230 C EN ISO 527 - 1 N / mm2 ≥ 2500
Charpy Notched Impact Strength at 230 C EN ISO 179 -1 / 1eA kJ / m2 ≥ 6
Ball Indentation Hardness EN ISO 2039 - 1 MPa ≥ 105
Heat Distortion Temperature HDT A 1.8 MPa EN ISO 75 - 2 0 C 66
Vicat - Heat Distortion Temperature B/50n ISO 306 0 C ≥ 76
Thermal Expansion Coefficient DIN 53752 mm / mK 0.07 - 0.08
Heat Conductivity at 230 C EN 12664 W / mK 0.15
Water Absorption at 230 C EN ISO 62 % ≤ 0.1
Limiting Oxygen Index (LOI) ISO 4589 - 1 % 42
CPVC
CPVC or Chlorinated Poly Vinyl Chloride is produced by chlorination of poly vinyl chloride (PVC) resin. In the process, the chlorine gas is decomposed into free chlorine
which is then reacted with PVC in a post production step, essentially replacing a portion of the hydrogen in PVC with chlorine. The extra chlorine molecule helps to increase its glass transition temperature (Tg) significantly, resulting in a CPVC which is extremely heat resistant. As a result CPVC performs much better in high temperature and high pressure applications than PVC.

Some of the advantages of CPVC for piping systems are:
  • Very good chemical and corrosion resistance
  • Outstanding chemical resistance
  • No electrochemical corrosion
  • Long service life, even under intensely corrosive conditions
  • No support microbial growth
  • Simple installation using solvent cementing
  • Smooth inner surface
  • Exceptional flammability resistance
  • No influence on drinking water

CPVC PROPERTISE (REFERENCE VALUES)

CHARECTERISTICS

TEST STANDARD

UNITS

VALUES

Density

ISO 1183-1

g / cm3

1.5

Yield Stress at 230 C

EN ISO 527 - 1

N / mm2

≥ 53

Tensile E - Modulus at 230 C

EN ISO 527 - 1

N / mm2

≥ 2550

Charpy Notched Impact Strength at 230 C

EN ISO 179 -1 / 1eA

kJ / m2

≥ 6

Ball Indentation Hardness

EN ISO 2039 - 1

MPa

≥ 110

Heat Distortion Temperature HDT A 1.8 MPa

EN ISO 75 - 2

0 C

≥ 102

Vicat - Heat Distortion Temperature B/50n

ISO 306

0 C

≥ 103

Thermal Expansion Coefficient

DIN 53752

mm / mK

0.06 - 0.07

Heat Conductivity at 230 C

EN 12664

W / mK

0.15

Water Absorption at 230 C

EN ISO 62

%

0.1

Limiting Oxygen Index (LOI)

ISO 4589 - 1

%

60

Polyethylene
Polyethylene is also produced from ethylene by way of polymerization. It consists only of carbon and hydrogen (hydrocarbons) and is also referred as polyolefin. It belongs to the semi-crystalline thermoplastics group and when compared with PVC and CPVC (both being amorphous thermoplastics) it show less tensile strength, melting temperature and a lower E modulus. However it exhibits higher impact resistance, elongation at rupture and thermal expansion.

It is an environmental friendly hydrocarbon product which does not dissolve in common solvents as well as hardly swells. Thus PE pipes cannot be solvent cemented like PVC and CPVC. The appropriate joining method for polyethylene is welding and commonly used welding techniques are butt fusion welding and electrofusion.

Polyethylene pipe materials of medium density (MDPE) to high density (HDPE) are ideal for industrial piping installations and the grades are classified on the basis of their internal pressure resistance e.g. PE 63 (MRS 6.3 MPa), PE 80 (MRS 8.0 MPa) and PE 100 (MRS 10 MPa).

The advantages include:
  • Low weight (around 1/8th of steel)
  • Outstanding flexibility
  • Good abrasion resistance
  • Corrosion and chemical resistance
  • High impact resistance even at very low temperature
  • Safe and easy joining by welding
  • Excellent cost effective

POLYETHYLENE PROPERTISE (REFERENCE VALUES)

CHARECTERISTICS
TEST STANDARD

UNITS

VALUES

Density ISO 1183-1 >g / cm3 0.93 - 0.95
Yield Stress at 230 C EN ISO 527 - 1 N / mm2 18 - 25
Tensile E - Modulus at 230 C EN ISO 527 - 1 N / mm2 700 - 900
Charpy Notched Impact Strength at 230 C EN ISO 179 -1 / 1eA kJ / m2 110 - 83
Charpy Notched Impact Strength at - 400 C EN ISO 179 -1 / 1eA kJ / m2 7 - 13
Ball Indentation Hardness (132N) EN ISO 2039 - 1 MPa 37
Crystallite Melting Point DIN 51007 0 C 131 - 130
Thermal Expansion Coefficient DIN 53752 mm / mK 0.15 - 0.20
Heat Conductivity at 230 C EN 12664 W / mK 0.38 - 0.43
Water Absorption at 230 C EN ISO 62 % 0.01 - 0.04
Limiting Oxygen Index (LOI) ISO 4589 - 1 % 17.4
Others
Ori-Past also deals with flexible (plasticized) PVC for manufacturing PVC Houses and LLDPE (low linear density polyethylene) for manufacturing of vertical Water Storage Tanks
 

 

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