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:

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MOCA

M.W: 267.16

CAS: 101-14-4

Melting point: 100^oC (212^oF)

SG (liquid): 1.26 @ 107^oC (225^oF)

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Ethacure 300

M.W: 214

CAS: 106264-79-3

Melting point: liquid at RT

SG (liquid): 1.21 @ 20^oC (68^oF)

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1,4-butanediol

M.W: 90.1

CAS: 110-63-4

Melting point: 20^oC (68^oF)

SG (liquid): 1.017

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HQEE

M.W: 198.22

CAS: 104-38-1

Melting point: >98oC (209^oF)

SG (liquid): 1.15 @ 110^oC (230^oF)

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TMP

M.W: 134.17

CAS: 77-99-6

Melting point: 58oC (136^oF)

SG (liquid): 1.085 @ 80^oC (176^oF)

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PTMEG

M.W: 1000

CAS: 25190-06-1

Melting point: 24^oC (75^oF)

SG (liquid): 0.981 @ 40^oC (104^oF)

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POLACURE

M.W: 314

CAS: 57609-64-0

Melting point: 125^oC (257^oF)

SG (liquid): 1.14 @ 140^oC (284^oF)

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UNILINK

M.W: 310

CAS: 5285-60-9

Melting point: Liquid at RT

SG (liquid): 0.99 @ 26.7^oC (80^oF)