Adcote A3305/CR 820 December 2009 Page 1 of 2 

ADCOTETM A3305/CR 820 

Laminating Adhesive 

Description and Features

Adcote A3305 adhesive is the polyester component of a two component laminating adhesive which requires

the use of an isocyanate coreactant. This polyester in conjunction with various isocyanate terminated 

coreactants functions as an adhesive for a variety of industrial laminations.

Adcote A3305 adhesive adheres to a wide variety of substrates including cellophane, treated polyolefins,

polyester, polyamide, aluminum foil, metallized and PVDC coated materials, PVF, and the treated

heat-sealable layers of coextrusions.

Adcote A3305 adhesive provides optical clarity, high bond strength, and a high level of heat and chemical

resistance.

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

modules with damp heat resistance (85°C, 85%RH) >1000 hours* and non-yellowing characteristics.* 

Typical Properties*

 Adcote A3305 CR 820

Solids 45% 100%

Viscosity 400-600 cps @ 25°C 3000 cps @ 25°C

Weight/Gallon 0.98 g/cc (8.2 lb) 1.16 g/cc (9.6 lb)

Solvents Methyl ethyl ketone None

Mix Ratio 100 pbw 5.7** pbw

Diluents Methyl ethyl ketone, toluene,

urethane grade ethyl acetate, 

or 1,1,1-trichloroethane

Shelf Life 180 days 180 days

(unopened containers)

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

considered part of a product specification.

**Optimum level of catalyst should be determined experimentally for each particular end-use. 

Other coreactants are available for special uses. Consult your Rohm and Haas sales representative for

further information.

Safety, Handling and Storage

• Store in cool, dry, well ventilated area. 

• 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. 

Alcohol and similar materials containing active hydrogen can react with Adcote A3305 adhesive causing 

inadequate cure.

Adcote A3305/CR 820 December 2009 Page 1 of 2

INDUSTRIAL LAMINATING 
Adcote A3305/CR 820 December 2009 Page 2 of 2 

Adcote A3305 can react or interact with other components of laminations. Retained solvents, slip additives, 

antiblock agents, and contaminated solvents are some of the components that may cause property changes 

of the film and/or adhesive. 

High molecular weight polyesters that are used in solution adhesives like Adcote A3305 have tendency to 

form a reversible structure in solution with time. This structuring is accelerated when the adhesive is 

exposed to temperatures below 50°F (10°C). The structuring is reversible if heat and shear is applied to 

the adhesive. We recommend placing the container of adhesive in a steam cabinet, allowing venting of 

the container and heating to 110-140°F (45-60°C). After the adhesive reaches the proper temperature, 

mix the adhesive in the container for 1-3 hours under moderate shear. Use of a disperser or “Cowles” 

type blade will shorten the time needed. 

Caution must be taken because of the flammability of the solvents used in the adhesive. Please 

review MSDS for hazards associated with the adhesive. 

Attempting to redisperse without heat may reduce the apparent viscosity, but not result in a 

homogeneous mix. Before using the adhesive, check, to make sure that all resin has returned to a true 

solution and no gels remain. 

Recommended Operating Conditions

Application Method Direct gravure 

Application Cylinder 95-130 line per inch 

Application Solids 25-35% 

Dry Adhesive Weight 3-18gms/m2 (2-11 lb/ream), depending on application. 

Drying Web Temperature 65-80°C (150-185°F) 

Lamination Temperature 60-70°C (140-160°F) 

Cure Time* 7-10 days at 21°C (70°F) 

Slitting/Rewinding Time 2-3 days at 21°C (70°F) 

Cleaning Solvent Methyl ethyl ketone or Ethyl Acetate 

*Recommend post curing at 45-55°C (115-130°F) for 3-5 days. 

_____________________________________________________________________ Adcote 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