Mor-Free L 75-173/C-145 January 2010 Page 1 of 4

MOR-FREETM L 75-173/C-145 

Fast Cure Solventless Laminating Adhesive 

Description and Features

Mor-Free L 75-173/C-145 is a solvent-free, 100% solids, two component polyurethane adhesive system that

can be applied at room temperature. As the reactivity of Mor-Free L 75-173/C-145 is high, the laminates can

generally be further processed in as little as 6 hours. The chemical curing is generally completed within 5 

days at room temperature of 72°F. As always, converters should verify appropriate cure times for their

individual application. 

 

Mor-Free L 75-173/C-145 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. 

Mor-Free L 75-173/C-145 offers rapid bond development to decrease time needed for processing while 

offering good metal adhesion. Mor-Free L 75-173/C-145 can be used for a wide range of applications at 

room temperature and below.

 

Typical Properties* 

(Isocyanate) (Polyol)

 Mor-Free L 75-173 C-145

Solids 100% 100%

Viscosity77°F 2400 cps 300-400 cps

Weight/Gallon 9.5 lb 8.7 lb

Appearance Clear, yellow Clear

Odor Practically none Practically none

Mixing Ratio 100 pbw 44 pbw

100 pbv 51 pbv

Shelf Life** 360 days 360 days 

(unopened containers)

*These items are provided for general information only. They are approximate values and are not

considered part of a product specification.

**Store in tightly closed container in cool, dry place. 

Mor-Free L 75-173/C-145 may react or interact with other components of laminations. Retained volatiles

(solvents or water), slip additives, antiblock agents and inks are some of the components that may cause

property changes of the laminated structure. 

Processing

Mor-Free L 75-173/C-145 must be used on machines which have been specially designed for solventless

laminations. Such equipment allows the adhesive to be fed through a meter/mix/dispense device and

provides web tension controls designed for adhesives with low initial tack.

As the reactivity of Mor-Free L 75-173/C-145 is high, the laminates can generally be further processed in

as little as 6 hours, depending on the laminate construction. The chemical curing is generally completed 

within 5 days at 25°C, depending on the laminate construction. As always, converters should verify

appropriate cure times for their individual application.

or-Free L 75-173/C-145 January 2010 Page 1 of 4 

PACKAGING AND

CONVERTING 

 M
Application Temperature

We recommend the application roll be set at 94°F (35°C), depending on machine design and line speed 

desired. No preheating of the adhesive or coreactant at the meter/mix/dispense unit is required. 

A relatively slow initial increase in viscosity is due to the exothermic reaction of the adhesive immediately 

after the mixing process and the mechanical influences in the application system. 

For short trial runs the adhesive can be batch mixed. We recommend preparation of no more adhesive than

can be used within 5-10 minutes. A high speed stirrer suitable for a homogeneous mixing should be used. 

However, the use of a meter/mix/dispense device which continuously mixes the adhesive at the chosen 

ratio, controls the feeding of the application unit, and stops production automatically in case of machine

failures, is indispensable for extended trials and normal production. 

When processing Mor-Free L 75-173, the safety rules for working with isocyanates must be observed. The

adhesive contains monomeric MDI. See Material Safety Data Sheet for specific details. 

Cleaning 

The application unit should be cleaned before the adhesive becomes insoluble by progressive curing, if the

machine stops take more than 30 minutes. 

If the application unit and mixing devices are combustion proof, they may be cleaned with esters or ketones 

such as ethyl acetate and MEK. 

Several commercially available solvents are safe and effective for flushing and cleaning Mor-Free 

adhesive residues from solventless laminators and meter/mix/dispensing equipment that do not have 

combustion proof ratings. We recommend contacting either Dynaloy, Inc. (800-669-5709; 

www.dynaloy.com), or Danko Industries (630-882-6070) for cleaning solvent recommendations. Always 

consult the solvent supplier’s MSDS for safety information before use. 

Storage 

Mor-Free L 75-173/C-145 can be stored in airtight, closed, unmixed, original containers in dry rooms at

temperatures of 70° ± 15°F. Opened containers should be used as quickly as possible. Both Mor-Free L 

75-173 and C-145 should be protected from freezing.

Safety, Handling and Storage 

• Store in cool, dry, well ventilated area away from heat and ignition sources. Keep container tightly 

closed. 

• Follow good manufacturing and handling practices. 

• Wash thoroughly after handling. Wash contaminated goggles, faceshield, and gloves. Professionally 

launder contaminated clothing before re-use. 

• ATTENTION! Container can be hazardous when empty. Follow label warnings even after container 

is empty. Do not reuse empty container without professional cleaning. 

• Refer to Material Safety Data Sheet for more information. 

 

Mor-Free L 75-173/C-145 January 2010 Page 2 of 4
 

Viscosity vs. Temperature of Mor-Free L 75-173/C-145

0

200

400

600

800

1000

1200

1400

0 10 20 30 40 50 60 7

Temperature (°C)

Visc

o

sity (

c

p)

0

 

Pot Life of Mor-Free L 75-173/C-145 at 43°C (110°F)

0.00

2000.00

4000.00

6000.00

8000.00

10000.00

12000.00

14000.00

16000.00

0:00 0:28 0:57 1:26 1:55 2:24 2:52

Time (hours:minutes)

Visc

o

sity (

c

p)

 

MOR-FREE is a registered trademark of Rohm and Haas Company 

These suggestions and data are based on information we believe to be reliable. They are offered in good faith, but without 

guarantee, as conditions and method of use of our products are beyond our control. We recommend that the prospective user 

determine the suitability of our materials and suggestions before adopting them on a commercial scale.

Suggestions for uses of our products or the inclusion of descriptive material from patents and the citation of specific patents in this 

publication should not be understood as recommending the use of our products in violation of any patent or as permission or license 

to use any patents of the Rohm and Haas Company. 

Visit us at http://www.rohmhaas.com/AdhesivesSealants 

Address: Midwest Technical Center, 2531 Technology Drive, Suite 301, Elgin, IL 60124 Phone: 847-649-3800

Mor-Free L 75-173/C-145 January 2010 Page 3 of 4
Rohm and Haas Food and Drug Opinion 

Name: Mor-Free L 75-173 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 01/20/2010

Legend: 

L Yes, this product is cleared with limitations noted

N No, this product is not cleared

Y Yes, this product is cleared.

A Affirmed as compliant based on migration studies.

Regulations: 

21CFR175.105 Adhesives

Disclaimer: 

 This information relates specifically to this product. We believe this information to be accurate and 

reliable as of this date. 

 We recommend that our customers make their own determination on the suitability of this product for 

their particular application.

 We cannot guarantee that the indirect food additives/food-contact status of this product will remain 

unchanged indefinitely; therefore we recommend that you periodically verify its status. 

Name: MOR-FREE COREACTANT C-145 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 L 02/02/2006 ▪ FOR USE ONLY IN THE PREPARATION OF POLYURETHANE 

RESINS. 

Legend: 

L Yes, this product is cleared with limitations noted

N No, this product is not cleared

Y Yes, this product is cleared.

A Affirmed as compliant based on migration studies.

Regulations: 

21CFR175.105 Adhesives

Disclaimer: 

 This information relates specifically to this product. We believe this information to be accurate and 

reliable as of this date. 

 We recommend that our customers make their own determination on the suitability of this product for 

their particular application.

 We cannot guarantee that the indirect food additives/food-contact status of this product will remain 

unchanged indefinitely; therefore we recommend that you periodically verify its status. 

 

Mor-Free L 75-173/C-145 January 2010 Page 4 of 4