SBS POLYMER BITUMEN MEMBRANE

SBS or styrene-butadiene (styrene-butadiene-styrene) is co polymers that have been

block polymerize from a family of elastic polymer with elastic polymers with thermo-plastic properties.

SBS membranes allow excellent elongation and dimensional stability that allows excellent it to expand and contrast, preventing creasing and causing damage to the membrane. Another property these membranes posses is the of cold flexibility. Whereas ordinary membranes become brittle and crack in sub-zero temperatures, SBS membranes retain their flexibility even at the temperature up to -30c.

For this reason, SBS are very popular in European and northern American Companies However the resistance of SBS membranes to thermal cycling and high UV is quite low, making it unsuitable for roofs in tropical climates.

POLYSTYRINE Vs POLY URITHANE

In large multistory buildings, on account of large number of the wet areas, liquid

water proofing is often specific. In this case however cold applied chemotropic

emulsions are best suited on account of their elastomeric and moisture curing

properties.

These can be modified bitumen emulsions for normal uses or modified polyurethane emulsions where high performance is required.

CEMETIOUS & FIBRATED WATER PROOFING FOR WET AREAS

Cementations systems Cementations systems generally are available as ready-to-apply aqueous dispersions or are mixed in-situ.

The two component systems consist of a resin base, which is normally an acrylic co-polymer with water proofing properties and a cementations powered base for bonding and strength. Such system are generally used on roof and are applied by brush, roller or by spray.

A fabric scrim we suggested over expansion joints to protect the layer from tensile thermal expansion on the roof. Cementations systems are also applied over spray applied polyurethane thermal insulation as a protective layer, as these

systems possess high resistance to UV rays.

Since application skills require are minimum, they highly popular among maintenance contractors. However, it should be noted that the waterproofing and

durability membrane are proportional to the acrylic co-polymer content and care should be exercised in choosing one with adequate co-polymer content.

If it is used for water proofing water tanks, it is imperative that the composition of the system be analyzed carefully to exclude the possibility of inherit or generate toxicity.

MODIFIED BITUMEN AND P/U SYSTEMS

In large multistory buildings, on account of large number of the wet areas, liquid water proofing is often specific. In this case however cold applied chemotropic emulsions are best suited on account of their elastomeric and moisture curing properties.

These can be modified bitumen emulsions for normal uses or modified polyurethane emulsions where high performance is required.

MEMBRANOUS WATERPROOFING

Continuous layers of waterproofing are subjected to various dimensional instabilities such as cracking, Buckling, creeping. These are primarily brought about by accelerated thermal aging exposure to UV rays in the case of exposed systems.

The quality of workmanship and the choice of bonding techniques (such as full bonding, spot bonding or loose laying) go a long way in curtailing this.

The primary remedy to the problem however, rests in the choice of the polymer. That is added to the bitumen to modify its structural properties.

APP POLYMER BITUMEN MEMBRANE

APP or Atactice Poly Propane is the name given or disordered chains with elastromeric and plastomeric properties, which are added to the bitumen.

These impart an excellent resistance to thermal aging and UV rays, maintaining shape and structural properties at high temperatures(150’C) and a reasonable

good flexibility at low temperatures(15’C).

These properties make APP modified bitumen the ideal material of water proofing in the tropical climates of Asia and Africa