About
Polyurethane is a class of synthetic resinous, fibrous, or elastomeric compounds belonging to a family of organic polymers synthesised by the reaction between diisocyanates and bifunctional groups such as glycols.
It is a plastic material with versatile applications. It is tough but not brittle and can be tailored to be rigid or flexible. It is best known for the production of flexible foam used in upholstery and rigid foam used as a light weight structural material.
Properties
Potting and encapsulation
Bonding
Sealing
One component system
Polyurethane reacts with atmospheric moisture to cure into a tough urethane polymer.
Two component system
Polyurethane cures at both low and high temperatures with base catalyst. Isocyanates react with hydroxyl groups to form urethane polymer network.
Setting time: 30 mins to 24 hrs
Full strength:
7 days (1 component sealant)
72 hrs (2 component sealant)
One component system
Lamination adhesive (solvent based)
Two component system
Encapsulation and Potting
One component system
01. High flexibility
02. Low gas transition temperature (Tg = 40 °C)
03. Resistance to oils, solvents, ozone & general weather conditions
04. Good paintability
Two component system
01. Good mechanical properties
02. High flexibility
03. Low gas transition temperature (Tg = 40 °C)
04. Resistance to oils, solvents, ozone & general weather conditions
05. Good electrical properties
06. Available as low viscous liquid to high viscous paste
-40°C to 90°C
Two component 20°C to 35°C
Two component system
Some applications require vacuum procedures
Available in packs ranging from 1 kg to 200 kg
Available
The ideal storage temperature range is 20 °C and 30 °C
One component system
4 – 6 months
Two component system
4 – 12 months
Safe to transport by road, air and sea