3M™ Plastic Bonding Adhesive 2665
Product Description
3M™ Plastic Bonding Adhesive 2665 is a one-component, moisture curing, urethane adhesive that is applied warm.
This low viscosity adhesive has a long open time and is ideal for bonding plastics. Yields thin glue lines when used
with appropriate equipment.
Features
• 100% solids • High tack
• One component • High strength bonds
• Low viscosity • Bonds a variety of plastics
• Long open time

Typical Uncured Properties
Note: The following technical information and data should be considered representative or typical only and should not be
used for specification purposes.
Application Temperature 230°F (110°C)
Viscosity (@ 230°F/110°C)1 11,000 cps
Color (solid) White/Off-white
Open Time2,4 4 minutes
Set Time3,4 Immediate
1Measured on Brookfield viscometer with Thermosel using spindle #27.
2The bonding range of a 1/16" bead of molten adhesive on a non-metallic substrate.
3The minimum amount of time required between when the bond is made and when it will support a 5 psi tensile load.
4Open times and set times are based on a room temperature environment. High temperatures will lengthen open times and set times while lower environmental
temperatures will shorten open times and set times.

3M™ Plastic Bonding Adhesive 2665
Handling/Application Information
Directions for Use
Apply to clean, dry surfaces. Remove oil, grease and other contaminants by wiping with isopropyl alcohol.* For materials
that are often contaminated with mold release agents, it is recommended that the surface be solvent wiped, abraded and
solvent wiped.* For additional information on surface preparation, see section on Surface Preparation.
After heating to suggested application temperature, apply adequate amount of adhesive on one of the substrates to be
bonded. Join the substrates within the adhesives specified open time and hold the bonded part until the adhesive has
adequately set.
*Note: When using solvents, extinguish all ignition sources, and follow the manufacturer’s precautions and directions for use.
Dispensing Equipment
3M™ Plastic Bonding Adhesive 2665 can be dispensed using either a time-pressure dispenser system with luer-lok needle
tips or a positive displacement or gear metering valve to yield thin glue lines. Please approach your local technical team
for more application support.
Container Sizes Available: 30 ml syringes and 295 ml cartridges.
Cleanup: Allow product to solidify. Remove uncured waxy material (usually within the first 20 minutes after application)
by scraping with a putty knife or similar tool. For cured material, remove by cutting or sanding. Do not use heat or flame
to remove adhesive.
Cure Time: The cure rate will vary depending on air temperature, relative humidity, substrate type and bond line thickness.
Typical Performance Characteristics
Note: The following technical information and data should be considered representative or typical only and should not be
used for specification purposes.
Overlap Shear Strength (psi), tested @ 73°F (23°C), Thermal Shock (TS)* and Temperature/Humidity (TH)**
OLSS (PSI)
Substrate 73°F (23°C) After TS After TH
Polycarbonate 940 1,115 945
ABS 690 565 795
Acrylic 830 715 715
Stainless Steel 465 590 490
PVC 560 NT NT
*Condition for TS: -40° to 85°C, 30 minute dwell for 20 cycles.
**Condition for TH: 68°C/95% RH for 3 days.
NT: Not tested.
(2)

3M™ Plastic Bonding Adhesive 2665
Typical Performance Characteristics (continued)
Note: The following technical information and data should be considered representative or typical only and should not be
used for specification purposes.
Rate of Overlap Shear Strength (psi) Build-up @ 73°F (23°C)
Curing Time % of Ultimate
Substrate (hours) OLSS (PSI) OLSS
Polycarbonate 0.083 60 6.5
0.5 195 20
4.0 400 42
16.0 900 95
24.0 940 100
Test Procedures
A. Overlap Shear Strength
Overlap shear (OLS) strengths were measured on 1" wide 1/2" overlap specimens. These bonds were made individually
using 1" x 4" sample coupons. The thickness of the bond line was controlled with .003 - .006" stainless steel wires.
The thickness of the plastics substrates were 0.125".
All strengths were measured at 73°F (23°C) except where noted. The separation rate of the testing jaws was 2" per
minute.
B. Cure Cycle
All bonds were cured for a minimum period of 7 days at 77°F (25°C)/50% RH before testing. Bonds were prepared
using the suggested surface preparation procedure for the particular substrate tested.
Surface Preparation
Plastic: Wipe with isopropanol soaked cheesecloth.* Allow solvent to evaporate before bonding. For optimal performance,
heptane may be used. Note: 3M™ Plastic Bonding Adhesives are not recommended for bonding untreated polyolefins.
Plastic Contaminated with Mold Release: Wipe with isopropyl alcohol soaked cheesecloth, abrade with fine grit abrasive,
wipe with isopropyl alcohol soaked cheesecloth.* Allow solvent to evaporate before bonding. For optimal performance,
heptane may be used.
Metal: Wipe with Methyl Ethyl Ketone (M.E.K.) soaked cheesecloth, abrade with fine grit abrasive, wipe with M.E.K.
soaked cheesecloth.* Allow solvent to evaporate before bonding.
Glass: Wipe with M.E.K.-soaked cheesecloth.* Allow solvent to evaporate before bonding. Priming may be necessary on
glass if subject part will be subjected to hot/humid conditions.
*Note: When using solvents, extinguish all ignition sources, and follow the manufacturer’s precautions and directions for use.
Storage and Shelf Life
Shelf life is 12 months when stored at 60°F (16°C) to 80°F (27°C), indoors and protected from exposure to moisture.

Safety Information

Warning: hot syringes are a possible burn or explosion hazard.
To insure safe handling of 3M™ Plastic Bonding Adhesive 2665 syringes:
1. Do not remove the aluminum label from the syringe. It is designed to make the temperature of the syringe more uniform.
2. The syringe heater must have an opening sufficient to accommodate easy insertion and removal of the syringe including
the aluminum label.
3. Do not exceed 110°C (230°F) syringe temperature. Failure of the syringe could result.
4. Do not exceed 4.1 Bar (60 p.s.i.) dispensing pressure. Failure of the syringe could result.
5. Remove air pressure from the dispensing unit before removing the syringe from the heater.
6. Use only dry air for dispensing to prevent premature curing of the product.
7. Adhesive dripping is sometimes caused by a cured adhesive skin at the syringe back, and can normally be dislodged using
a probe. It is not necessary to remove the skin, merely breaking the seal to the syringe barrel normally cures the problem.
8. Use gloves and personal protective equipment when handling hot syringes to prevent burns or injury.

Certification/Recognition
MSDS: Refer to Product Label and Material Safety Data Sheet for Health and Safety Information before using this product.
For additional health and safety information, call 1-800-364-3577 or (651) 737-6501.
TSCA: The components of this product are in compliance with the chemical notification requirements of TSCA.
RoHs Complaint/REACH Compliant: 3M™ Plastic Bonding Adhesive 2665 complies with the European Union’s
“Restriction of Hazardous Substances” (RoHs) initiative and with European REACH regulations 2002/95/EC and 2005/618/EC.
For Additional Information
To request additional product information or to arrange for sales assistance, call toll free 1-800-251-8634. Address
correspondence to: 3M, Electronics Markets Materials Division, 3M Center, Building 225-3S-06, St. Paul, MN 55144-
1000. Our fax number is 651-778-4244 or 1-877-369-2923. In Canada, phone: 1-800-364-3577. In Puerto Rico, phone:
1-787-750-3000. In Mexico, phone: 52-70-04-00.
Important Notice
All statements, technical information, and recommendations related to 3M’s products are based on information believed
to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and
determine if it is suitable for your intended application. You assume all risks and liability associated with such use.
Any statements related to the product which are not contained in 3M’s current publications, or any contrary statements
contained on your purchase order shall have no force or effect unless expressly agreed upon, in writing, by an authorized
officer of 3M.
Warranty; Limited Remedy; Limited Liability.
This product will be free from defects in material and manufacture at the time of purchase. 3M MAKES NO OTHER
WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. If this product is defective within the warranty period stated above,
your exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M
product. Except where prohibited by law, 3M will not be liable for any indirect, special, incidental or consequential
loss or damage arising from this 3M product, regardless of the legal theory asserted.

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