Mor-Free L 75-164/C-78F April 2008 Page 1 of 4

MOR-FREETM L 75-164/C-78F

Fast Cure Solventless Laminating Adhesive 

Description 

Mor-Free L 75-164/C-78F 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 75-164/C-78F 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 75-164/C-78F 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 75-164/C-78F offers rapid bond development to decrease time needed for processing while

offering good metal adhesion. Mor-Free L 75-164/C-78F can be used for a wide range of applications at 

room temperature and below.

Typical Properties*

(Isocyanate) (Polyol)

Mor-Free L 75-164 C-78F

Solids 100% 100% 

Viscosity 2500-3500 cps 300-400 cps

Weight/Gallon 9.5 lb 8.7 lb 

Appearance Clear, Yellow Clear

Mix Ratio 100 pbw 33 pbw

100 pbv 39 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 containers in dry rooms at temperatures of 75°F ± 20°F. 

Mor-Free L 75-164/C-78F 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. If Mor-Free L 75-164/C-78F is used on high slip films (COF < 

0.2) or with high slip LDPE/LDPE laminations, then the user must verify that potential film property changes 

due to the lamination process and materials are acceptable for the end use performance requirements.

Mor-Free L 75-164 is sensitive to moisture and should be stored under and transferred with dry nitrogen. 

Recommended Coating Weight Range: 0.8 - 1.2 lb/ream

Mor-Free L 75-164/C-78F April 2008 Page 1 of 4

PACKAGING AND

BUILDING MATERIALS 
This two component solventless adhesive system is virtually independent of the need for moisture for 

curing. 

The original viscosity of the mixture can be reduced by preheating the application rollers to a typical 

temperature of 120° - 140°F (50° - 60°C). Higher temperatures may be required depending on the line 

speed, machine configuration, and choice of substrates. 

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 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 75-164/C-78F, 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 applicable unit and mixing device 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. 

Safety, Handling and Storage 

• Mor-Free L 75-164/C-78F can be stored for 360 days in airtight, closed, original containers in dry 

rooms at temperatures of 70 ± 20°F. Opened containers should be used as quickly as possible. 

• 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, face shield, 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 75-164/C-78F April 2008 Page 2 of 4
Pot Life of 100:33 Mor-Free L 75-164/C78F at 120°F

0

2000

4000

6000

8000

10000

12000

14000

0:00:00 0:28:48 0:57:36 1:26:24 1:55:12 2:24:00 2:52:48

Time

Viscosity, cp

49°C

Viscosity vs. Temperature of Mor-Free L75-164/C78F

0

500

1000

1500

2000

2500

70 80 90 100 110 120 130

Temperature of Mixture (°F)

Viscosity (

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

Rohm and Haas Company, Midwest Technical Center, 2531 Technology Drive, Suite 301, Elgin, IL 60124Phone: 847-649-3800 

Fax: 847-649-3760

Mor-Free L 75-164/C-78F April 2008 Page 3 of 4
Rohm and Haas Food and Drug Opinion 

Name: MOR-FREE(TM) L 75-164 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 02/14/2007

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. 

Rohm and Haas Food and Drug Opinion 

Name: COREACTANT C-78F 

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 75-164/C-78F April 2008 Page 4 of 4