Mor-Free 403A/BHT-Modified C-411 August 2009 Page 1 of 6

MOR-FREETM 403A/BHT-Modified C-411 

Solventless Laminating Adhesive

Description and Features

Mor-Free 403A + BHT-Modified BHT-Modified Coreactant C-411 is a solventless, two component,

polyurethane adhesive system which is applied at low temperature. Two levels of BHT modification are

available in the BHT-Modified Coreactant, depending on the end use requirements. Mor-Free 403A is

suitable for laminating nylon, aluminum, polyester, polyethylene, and other packaging substrates, unprinted

or reverse printed. 

Typical Properties* 

(Isocyanate) BHT-Modified Coreactant (Polyol) 

Mor-Free 403A C-411-5BHT C-411-10BHT

Solids 100% 100% 100% 

Viscosity 77°F 1700 cps 1200 cps 1300cps

Weight/Gallon 9.8 lb 9.0 lb 9.0 lb 

Appearance Clear, yellow Clear Clear

Odor Practically none Practically none Practically none

Mixing Ratio 100 pbw 63 pbw 66 pbw 

 100 pbv 67 pbv 71 pbv 

Shelf Life** 360 days 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 403A + BHT-Modified Coreactant 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 403A + BHT-Modified Coreactant 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 403A is sensitive to moisture and should be stored under and transferred with dry nitrogen. 

Processing

Mor-Free 403A + BHT-Modified Coreactant 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 403A + BHT-Modified Coreactant is high, the laminates can generally be further

processed in as little as 12 hours, depending on the laminate construction. The chemical curing is generally

completed within 7 days at 75°F, depending on the laminate construction. As always, converters should

verify appropriate cure times for their individual application. 

Application Temperature

e recommend the application roll be set at 122° - 140°F (50° - 60°C) or higher, depending on machine 

design and line speed desired. No preheating of the adhesive or BHT-Modified Coreactant at the

meter/mix/dispense unit is required. 

Mor-Free 403A/BHT-Modified C-411 August 2009 Page 1 of 6

PACKAGING AND

CONVERTING

W
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 403A + Coreactant, 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. 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 (630-882-6070) for cleaning solvent recommendations. Always consult the solvent 

supplier’s MSDS for safety information before use. 

Storage 

Mor-Free 403A and its BHT-modified coreactants can be stored for 6 months in airtight, closed, original 

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

possible. 

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, 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 403A/BHT-Modified C-411 August 2009 Page 2 of 6
Pot Life of Mor-Free 403A/C 411-5BHT (100:63) at Various

Temperatures

0.0

2000.0

4000.0

6000.0

8000.0

10000.0

12000.0

0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00

Time, min

Viscosity

(Brookfield

#27/4), cp 110°F (43.3°C)

120°F (48.9°C)

100°F (37.8°F)

Pot Life of Mor-Free 403A/C 411-10BHT (100:66) at Various

Temperatures

0.0

2000.0

4000.0

6000.0

8000.0

10000.0

12000.0

0 10 20 30 40 50 60 70 80

Time, min

Viscosity

(Brookfield

#27/4), cp

110°F (43.3°C)

120°F (48.9°C)

100°F (37.8°F)

Viscosity vs. Temperature of Mor-Free 403A/C 411-5BHT

0

200

400

600

800

1000

1200

1400

95 100 105 110 115 120 125

Temperature of Mixture (°F)

Viscosity

(Brookfield 

#27/4), cp

Mor-Free 403A/BHT-Modified C-411 August 2009 Page 3 of 6
Viscosity vs. Temperature of Mor-Free 403A/C 411-10BHT

0

200

400

600

800

1000

1200

1400

95 100 105 110 115 120 125

Temperature of Mixture (°F)

Viscosity

(Brookfield

#27/4), cp

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 403A/BHT-Modified C-411 August 2009 Page 4 of 6
Rohm and Haas Food and Drug Opinion 

Name: MOR-FREE 403A ADHESIVE 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 07/21/2009

21CFR175.300 N 07/21/2009

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

21CFR175.300 Resinous and polymeric coatings

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 403A/BHT-Modified C-411 August 2009 Page 5 of 6
Rohm and Haas Food and Drug Opinion 

Name: MOR-FREE C411-5BHT 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 12/04/2008

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

Name: MOR-FREE C411-10BHT 

Regulation Complies Opinion 

Date Limitations 

21CFR175.105 Y 12/04/2008

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 403A/BHT-Modified C-411 August 2009 Page 6 of 6