Mor-Free™ 421 is a solvent-free, 100% solids, two component polyurethane adhesive system that can be applied at room temperature. As the reactivity of Mor-Free™ 421 is high, the laminates can generally be further processed in as little as six hours. The chemical curing is generally completed within 3 days at room temperature (72 °F). As always, converters should verify appropriate cure times for their individual application. Mor-Free™ 421 can be used for laminating all polyolefin films, including LDPE to LDPE, OPP to OPP, and OPP to LDPE, as well as nylon, aluminum, polyester, and other packaging substrates. The films may be unprinted or reverse printed with the appropriate laminating grade inks.

Features & Benefits

Mor-Free™ 421 offers rapid bond development to decrease time needed for processing while offering good metal adhesion. Mor-Free™ 421 can be used for a wide range of applications at room temperature and below.

Key Properties

Application Method
Smooth roll transfer
C-145, C-132-2, C-411
Coating Weight
0.8-1.2 lbs/ream
Clear Yellow Liquid
9.5 lbs/gallon
Mix Ratio
100:33 with C-145, 100:63 with C-132-2, 100:40 with C-411
Key Performance Benefits
Fast bond development, good runability
Shelf Life
360 days
Applied Solids
100 %
Supplied Solids
100 %
Cure Time
3 days at 77 °F
Mixed Viscosity
750 cPs @ 120 °F
Nip Temperature
120 °F
Nominal Application Temperature
120 °F
Post Process Time
4-8 hours time to slit
Pot Life
30-40 min @ 120 °F
LDPE to LDPE, OPP to OPP, and OPP to LDPE, as well as Nylon, Aluminum, Polyester
2,500-3,500 cPs

Technical Resources

The Importance of Quality Control Testing By being diligent in recording and monitoring tests for each laminated structure many potential laminate problems can be averted. Read More...
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