MOR-FREETM 3325/CR 833

Solventless Laminating Adhesive

Description 

Mor-Free 3325/CR 833 is a solventless, two component, polyurethane adhesive system which is applied 

at low temperature. This adhesive system is used for film/film applications. This adhesive has shown 

good adhesion to a wide variety of clear barrier films.

This adhesive has shown good heat and humidity resistance in a back sheet structure for photovoltaic 

modules.

Typical Properties*

Mor-Free 3325 CR 833

Solids 100% 100%

Viscosity 77 F 3500 cps 1800 - 4000 cps

Weight/Gallon 9.85 lb (1.18 g/cc) 9.75 lb (1.17 g/cc)

Appearance Clear, Yellow Clear

Odor -------- Practically none-------

Mixing Ratio 100 pbw 100.0 pbw

100 pbv 100.0 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.

Mor-Free 3325/CR 833 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 3325/CR 833 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.

Processing

Mor-Free 3325/CR 833 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.

Mor-Free 3325/CR 833 cures sufficiently for further processing in 5 - 7 days @ 25oC. Avoid hot room cure 

for first 48 hours. 

Preheating the adhesive and coreactant is not required under normal use to lower the viscosity. The 

application rolls should be heated to approximately 110 - 130°F or higher depending on line speed.

When processing Mor-Free 3325/CR 833, the safety rules for working with isocyanates 

must be observed.

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. 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.

Mor-Free 3325/CR 833 September 2009 Page 1 of 3

INDUSTRIAL LAMINATING 
Mor-Free 3325/CR 833 September 2009 Page 2 of 3

Cleaning

Depending on the design of the meter/mix/dispense unit, it should be cleaned before the adhesive 

becomes insoluble by progressive curing, if the machine stops for more than 15 minutes. Methylene 

chloride can be used to flush the mixing and metering units where a non-flammable solvent is required. 

Consult the Material Safety Data Sheet from the methylene chloride supplier for safe handling.

If the application 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 (630-761-3188) for cleaning solvent recommendations. Always 

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

Safety, Handling and Storage

 Mor-Free 3325 and its coreactant can be stored for 12 months in airtight, closed, original containers 

in dry rooms at temperatures of 70F±15F. Opened containers should be used as quickly as 

possible.

 Store in a well ventilated area away from heat and ignition sources. 

 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 3325/CR 833 September 2009 Page 3 of 3

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 60124

Phone: 847-649-3800 Fax: 847-649-3760

Pot Life Curve @ 130°F (54.4°C)

Mor-Free 3325 + CR 833 (100:100 pbw)

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2000

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12000

14000

0 5 10 15 20 25 30

Time, Minutes

Viscosity, CPS

Temperature vs. Viscosity Curve

Mor-Free 3325 + CR 833 (100:100 pbw)

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500

1000

1500

2000

2500

3000

3500

4000

4500

5000

90 100 110 120 130 140

Temperature of Mixture, °F

Viscosity, CPS