MOR-FREETM 225/MOR-FREE C-33 

Solventless Laminating Adhesive

Description 

Mor-Free 225/Mor-Free C-33 is a solventless, two component, polyurethane adhesive system which is 

applied at low temperature. This adhesive system is used for film/film retort applications. This adhesive 

has shown good adhesion to a wide variety of clear barrier films. 

Typical Properties* 

(Polyester) (Isocyanate) 

 Mor-Free 225 Mor-Free C-33 

Solids 100% 100% 

Viscosity 77 F 3500 cps 1800 - 4000 cps 

Weight/Gallon 9.85 lb 9.75 lb 

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 225/Mor-Free C-33 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 225/Mor-Free C-33 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 225/Mor-Free C-33 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 225/Mor-Free C-33 cures sufficiently for further processing in 5 - 7 days @ 25oC. Avoid hot room 

cure for first 48 hours. Allow 14 days cure @ 25oC before retorting. 

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 225/Mor-Free C-33, 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 225/C-33 October 2010 Page 1 of 5 

PACKAGING AND 

BUILDING MATERIALS 
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 225 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 225/C-33 October 2010 Page 2 of 5 
Pot Life Curve @ 130°F (54.4°C)

Mor-Free 225 + C-33 (100:100 pbw)

0

2000

4000

6000

8000

10000

12000

14000

0 5 10 15 20 25 30

Time, Minutes

Viscosity, CPS

Temperature vs. Viscosity Curve

Mor-Free 225 + C-33 (100:100 pbw)

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

90 100 110 120 130 140

Temperature of Mixture, °F

Viscosity, CPS

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 

Mor-Free 225/C-33 October 2010 Page 3 of 5 
Rohm and Haas Food and Drug Opinion 

Name: MOR-FREE (TM) 225 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 02/02/2006

21CFR177.1390 A 02/02/2006 ▪ The combination of MOR-FREE (TM) 225/Mor-Free C-33 may be 

used as an adhesive layer in multilaminate food packaging materials 

with all food types and with no limitations as to the type of foodcontact layer used in compliance with the Federal Food, Drug, and 

Cosmetic Act. 

21CFR177.1395 A 02/02/2006 ▪ In accordance with the limitations as described under 

21CFR177.1390 above. 

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

21CFR177.1390 Laminate structures for use at temperatures of 250F and above

21CFR177.1395 Laminate structures for use at temperatures between 120F and 250F

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 225/C-33 October 2010 Page 4 of 5 
Rohm and Haas Food and Drug Opinion 

Name: MOR-FREE (TM) C-33 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 L 09/24/2001 ▪ FOR USE ONLY IN THE PREPARATION OF POLYURETHANE 

RESINS. 

21CFR177.1390 A 02/02/2006 ▪ A = AFFIRMED AS COMPLIANT BASED UPON MIGRATION 

STUDIES. THE COMBINATION OF MOR-FREE 225/MOR-FREE C33 MAY BE USED AS AN ADHESIVE LAYER IN MULTILAMINATE 

FOOD PACKAGING MATERIALS WITH ALL FOOD TYPES AND 

WITH NO LIMITATIONS AS TO THE TYPE OF FOOD-CONTACT 

LAYER USED IN COMPLIANCE WITH THE FEDERAL FOOD, 

DRUG, AND COSMETIC ACT. 

▪ A = AFFIRMED AS COMPLIANT BASED UPON MIGRATION 

STUDIES. THE COMBINATION OF MOR-FREE1390A/MOR-FREE 

C-33 MAY BE USED AS AN ADHESIVE LAYER IN 

MULTILAMINATE FOOD PACKAGING MATERIALS WITH ALL 

FOOD TYPES AND WITH NO LIMITATIONS AS TO THE TYPE OF 

FOOD-CONTACT LAYER USED IN COMPLIANCE WITH THE 

FEDERAL FOOD, DRUG, AND COSMETIC ACT. 

▪ The combination of Mor-Free L75X154/Mor-Free C-33 may be 

used as an adhesive layer in multilaminate food packaging materials 

with all food types and with no limitations as to the type of foodcontact layer used in compliance with the Federal Food, Drug, and 

Cosmetic Act. 

21CFR177.1395 A 02/02/2006 ▪ In accordance with the limitations as described under 

21CFR177.1390 above. 

21CFR177.1680 L 09/24/2001 ▪ 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

21CFR177.1390 Laminate structures for use at temperatures of 250F and above

21CFR177.1395 Laminate structures for use at temperatures between 120F and 250F

21CFR177.1680 Polyurethane resins

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 225/C-33 October 2010 Page 5 of 5