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Hot Melt Adhesive
Technical Data
July, 2016
3M™ Hot Melt Adhesives are 100% solids, thermoplastic resins that become fluid
when heated and quickly wet the bonding surface. They cool, harden and reach bond
strength in seconds, keeping production flowing by eliminating clamps, fixturing and
drying, and saving time energy and space.
3M™ Hot Melt 3776LM, 3792LM, 3738 and 3792 are thermoplastic adhesives with
low to medium viscosity and long open times. They bond to wide variety of substrates
such as wood, plain and coated corrugated, sand cores, foams, many plastics, and other
lightweight materials.
3M™ Hot Melt Adhesive 3792
Multi-purpose adhesive with medium viscosity.
Bonds dissimilar substrates such as wood to
plastic, fabric to metal.
Low temperature dispensing version of 3792.
Excellent for coated papers, plastics and other
heat sensitive substrates.
General purpose bonder with low temperature
dispensing.
Low viscosity and long open time for high flow
rates, thin bonds, and repositionability.
3776LM • 3792LM • 3738 • 3792
Product Description
3M™ Hot Melt Adhesive 3792LM
3M™ Hot Melt Adhesive 3776LM
3M™ Hot Melt Adhesive 3738
Typical Physical
Properties
Features
100% Solids, no VOCs
Easy to use
Long open times allow for ease use on large assemblies and large surfaces
Adhesive sets and obtains strength in seconds
Low Melt (LM) adhesives are designed for low temperature application and heat
sensitive substrates
Ideal for woodworking and general industrial applications.
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
Color (solid)
Density (g/cm
3
)
Flashpoint (°F)
1
3776LM
Tan
0.95
460
3M™ Hot Melt Adhesive
3792LM
3738
Clear
Tan
1.01
0.95
> 450
550
3792
Clear
0.095
> 450
(1) Determined by Cleveland Open Cup ASTM D 92-72
3M™ Hot Melt Adhesive
3776LM • 3792LM • 3738 • 3792
Directions for
Use
1. Surface Preparation:
Surfaces must be clean, dry and dust free. Wipe with a solvent such
as isopropyl alcohol for plastic substrates to aid in removing oil and dirt.*
*Note:
When using solvents, extinguish all ignition sources, including pilot lights, and
follow the manufacturer’s precautions and directions for use.
2. Application:
3M™ Hot Melt Adhesives are designed for application with a 3M™ Hot
Melt Applicators. Read and follow the precautions and directions for use in the user’s manual
before operating the applicator. 3M™ Hot Melt Adhesives are applied at 350-385°F, except
the Low Melt (LM) series which are designed to be applied at 250-275°F. LM series are
adhesives designed for lower temperature application but still yield long-lasting bonds.
Extruded bead sizes can be customized using 3M™ applicator tips.
3. Coverage:
3M™ Hot Melt Adhesives yield approximately 430 linear feet per pound of
adhesive when extruded as a 1/8” diameter semi-circular bead.
4. Set up time:
After the bond is made, 3M™ Hot Melt Adhesives immediately build
strength and no clamping is necessary. Set will occur faster on cold or metallic
substrates.
Typical
Application
Properties
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
3776LM
Application
Temperature
1
Viscosity (CPS)
2
Open Time
(seconds)
3
Delivery Time
(seconds)
4
Available
sizes/forms
250-270°F/
121-132°C
8,250 @
250°F
40
47
5/8”x8”Q
1”x3” PG
1/2”x12”AE
3M™ Hot Melt Adhesive
3792LM
3738
250-270°F/
121-132°C
10,500 @
250°F
40
57
5/8”x8”Q
5/8”x2” TC
1”x3” PG
1/2”x12”AE
1/8” Bulk
3792
350-385°F/
177-196°C
5,000 @
375°F
50
45
5/8”x8”Q
5/8”x2” TC
1”x3” PG
1/2”x12”AE
1/8” Bulk
350-385°F/
177-196°C
2,875 @
375°F
50
35
5/8”x8”Q
5/8”x2” TC
1”x3” PG
1/2”x12”AE
1/8” Bulk
(1) Recommended application temperature range. Temperature can be adjusted to regulate desired
viscosity, delivery rate and pot life.
(2) Brookfield Thermocel Viscometer in Centipoise using a #27 Spindle @ 10 RPM.
(3) Open time is the maximum time between the application of the adhesive and when the parts
must be joined together. Data based on 1/8" semicircular bead on non-metallic substrates at 75°F.
Higher environmental temperatures and/or larger beads will lengthen open times.
(4) Extrusion time for one 1”x3” PG cartridge.
3M™ Hot Melt Adhesive
3776LM • 3792LM • 3738 • 3792
Typical
Performance
Properties
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
3776LM
Heat Resistance
1
Ball & Ring Melt
Point
2
Shear Strength
3
Peel Strength
4
UL94 Listing
FDA Indirect
Food Contact
5
140°F/ 60°C
184°F/ 84°C
600 psi
9 piw
n/a
n/a
3M™ Hot Melt Adhesive
3792LM
3738
140°F/ 60°C
178°F/ 81°C
350 psi
13 piw
V2
21 CFR
175.105
130°F/ 54°C
186°F/ 86°C
375 psi
13 piw
V2
21 CFR
175.105
3792
140°F/ 60°C
179°F/ 81°C
250 psi
13 piw
V2
21 CFR
175.105
(1) Highest temperature that the adhesive will support a 2 psi dead load.
(2) ASTM E28-67.
(3) Overlap shear measured on Douglas Fir to Douglas Fir.
(4) Measured in pounds per inch width (piw). Flexible canvas bonded to Douglas Fir.
(5) Permitted for indirect food contact subject to the limitations in applicable CFR section(s).
Storage
Store product below 120°F (49°C).
Shelf Life
When stored at the recommended conditions, this product has a shelf life of 2 years
after 3M ships the product to a customer or distributor.
Precautionary
Information
Product Use
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
All statements, technical information and recommendations contained in this document are based upon
tests or experience that 3M believes are reliable. However, many factors beyond 3M’s control can affect
the use and performance of a 3M product in a particular application, including the conditions under
which the product is used and the time and environmental conditions in which the product is expected to
perform. Since these factors are uniquely within the user’s knowledge and control, it is essential that the
user evaluate the 3M product to determine whether it is fit for a particular purpose and suitable for the
user’s method of application.
Warranty and
Limited Remedy
Unless stated otherwise in 3M’s product literature, packaging inserts or product packaging for individual
products, 3M warrants that each 3M product meets the applicable specifications at the time 3M ships the
product. Individual products may have additional or different warranties as stated on product literature,
package inserts or product packages. 3M MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY ARISING OUT OF A COURSE OF
DEALING, CUSTOM OR USAGE OF TRADE. User is responsible for determining whether the 3M product
is fit for a particular purpose and suitable for user’s application. If the 3M product is defective within the
warranty period, your exclusive remedy and 3M’s and seller’s sole obligation will be, at 3M’s option, to
replace the product or refund the purchase price.
3M™ Hot Melt Adhesive
3776LM • 3792LM • 3738 • 3792
Limitation of Liability
Except where prohibited by law, 3M and seller will not be liable for any loss or damage arising from the
3M product, whether direct, indirect, special, incidental or consequential, regardless of the legal theory
asserted, including warranty, contract, negligence or strict liability.
ISO 9001 2000
:
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2000 standards.
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Industrial Adhesives and Tapes Division
3M Center, Building 225-3S-06
St. Paul, MN 55144-1000
800-362-3550 • 877-369-2923 (Fax)
www.3M.com/Adhesives
3M is a trademark of 3M. Printed in U.S.A.
©3M 2016
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