Common Urethane Extenders / Crosslinkers

Chain extenders, also known as curatives, are either hydroxyl (-OH) or amine (-NH2) terminated.

A wide variety of different cross-linkers with different reactivities can be found.

Some commonly used ones include:

M.W: 267.16
CAS: 101-14-4
Melting point: 100°C (212°F)
SG (liquid): 1.26 @ 107°C (225°F)

M.W: 214
CAS: 106264-79-3
Melting point: liquid at RT
SG (liquid): 1.21 @ 20°C (68°F)

M.W: 90.1
CAS: 110-63-4
Melting point: 20°C (68°F)
SG (liquid): 1.017

M.W: 198.22
CAS: 104-38-1
Melting point: >98°C (209°F)
SG (liquid): 1.15 @ 110°C (230°F)

M.W: 134.17
CAS: 77-99-6
Melting point: 58°C (136°F)
SG (liquid): 1.085 @ 80°C (176°F)

M.W: 1000
CAS: 25190-06-1
Melting point: 24°C (75°F)
SG (liquid): 0.981 @ 40°C (104°F)

M.W: 314
CAS: 57609-64-0
Melting point: 125°C (257°F)
SG (liquid): 1.14 @ 140°C (284°F)

M.W: 310
CAS: 5285-60-9
Melting point: Liquid at RT
SG (liquid): 0.99 @ 26.7°C (80°F)