Polyurethane

Among prominent insulation materials in residential and industrial applications, polyurethane (PUR) and polyisocyanurate (PIR) are considered as best cold insulations. PUR and PIR are extensively used in oil, gas and petrochemical applications, residential and construction, pharmacy and food industries, piping and processing.

Polyurethane is chain polymeric compound, made from chemical reaction of polyisocyanurate and polyol which forms chains of urethane bounds (-NH-(CO)-O). This reaction is an exothermic reaction and results in no side materials.

Polyurethane insulation materials which are known by PUR, are among closed cell and rigid insulating foams for cold applications. Polyurethane are presented in preformed slabs or sprayed or injected in place.

 

PUR thickness vs others

 

Polyurethane is extensively applicable, not only for insulating purposes, but also for various industrial applications, such as non-wearing rollers, supports and elements under heavy pressure, plastic components, gears and rolls, etc. different polyurethane products have different density and minor chemical composition diversity. Polyurethane insulation products are identical to polyisocyanuare products in many ways.

 

PROPERTIES *

UNIT

DESCRIPTION

STANDARD

Appearance

-

Rigid Foam

-

Color

-

Yellow - TAN – Light Brown

-

Odor

-

Odorless

-

Thermal Conductivity

W/m.K

0.023

ASTM C518 : 2004

Temperature Limits

0C

From [-196] to [+120]

ASTM C518 : 2004

Density

Kg/m3

50±4

ASTM D1622 : 2003

Closed Cell Content

%

96.6

ASTM D2856 : 1994

Permeability

µgm/Ns

1.7 × 10-3

ASTM E96 : 2005

Water Vapor Transmission

B / m2

34.6

ASTM D2842 : 1994

Water Absorption by (%) Volume

ppm

<0.7

ASTM C272

Solubility in Water

-

insoluble

ASTM D1622 : 2003

Auto Ignition Temperature

0C

>450

ASTM : D1929

Flammability

-

B2

ASTM E84 : 2005

Stability

-

Stable

ASTM E84 : 2005

Reactivity

-

Non-reactive

ASTM E84 : 2005

Volatility

 

Non-volatile

 

Thermal Elongation Index

m/m0C

6 ×1.0-5

ASTM C518 : 2004

Compressive Strength (x)

N/cm2

34

ASTM D1621 : 2004

Compressive Strength (y)

N/cm2

31

ASTM D1621 : 2004

Compressive Strength (z)

N/cm2

44

ASTM D1621 : 2004

* All properties have been measured in 23 0C (74 0F)

 

General Properties of Polyurethane

  • Low thermal conductivity, suitable for insulating purposes
  • Resistant to acids, alkaline, solvents and oils
  • Resistant to moisture and water vapor infiltration
  • Light weight
  • Great dimensional stability
  • Chemical stability
  • Producible in different densities, upon customer’s order, from 26 to 450 kg/m3
  • Producible in complicated forms and cut by CNC
  • Compatibility with many industrial materials and assemblies, such as aluminum, craft papers, steel and iron, rockwool and slagwool, glasswool, tar, cement, concrete and gypsum, etc.

 

                     PUR canal 3  PUR 1  PUR spray 1

 

Polyurethane Applications

  • Cold insulation, most appropriate for air ducts and air conditioning systems
  • Suitable for cryogenic systems
  • Suitable insulation material for sandwich panels
  • Suitable for insulating tanks, piping and processing equipment
  • Suitable for insulating complex geometries or hard to access places
  • Suitable for heavy load supports
  • Potential recycling and reusability