3
Hot Melt Adhesive
3747 • 3779 • 3789 • 3797
Technical Data
Product Description
July, 2016
3M™ Hot Melt Adhesives are heat applied, 100% solids adhesives. 3M™ Hot Melt
3747, 3779, 3789 and 3797 are thermoplastic adhesives to bond to wide variety of
substrates such as wood, plastic, vinyl, metal and glass.
3M™ Hot Melt Adhesive 3747
General purpose adhesive for bonding dissimilar
substrates such as wood to plastic, fabric to metal.
3M™ Hot Melt Adhesive 3779
High strength bonding with excellent
environmental stability including very high heat
resistance. Fast set time.
3M™ Hot Melt Adhesive 3789
High performance for plastic with good fuel, oil
and plasticizer resistance. Long open time.
3M™ Hot Melt Adhesive 3797
Low viscosity for fast flow rates, good high
temperature resistance, and fast set. Good for
electrical potting.
100% solids, no VOCs
Easy to use
Long open times allow for easy use on large assemblies and large surfaces
Adhesive sets and obtains strength in seconds
Creates high performance bonds
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.
Features
Typical Physical
Properties
Color (solid)
Density (g/cm
3
)
Flashpoint (°F)
1
Directions for
Use
3747
Tan
0.97
509
3M™ Hot Melt Adhesive
3779
3789
Amber
Brown
0.99
0.95
550
>392
3797
Off-White
0.92
570
(1) Determined by Cleveland Open Cup ASTM D 92-72.
1. Surface Preparation:
Surfaces must be clean, dry and dust free. Wipe with a solvent
such as isopropyl alcohol for plastic, metal and glass substrates to remove 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. Adhesives yield approximately 430 linear feet per pound of adhesive when
extruded as a 1/8” diameter semi-circular bead. Extruded bead sizes can be customized
using 3M™ applicator tips.
3M™ Hot Melt Adhesive
3747 • 3779 • 3789 • 3797
Directions for
Use (continued)
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.
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
Typical
Application
Properties
3747
Application
Temperature
1
Viscosity (CPS)
2
Open Time
(seconds)
3
Delivery Time
(seconds)
4
Available
sizes/forms
350-385°F/
177-196°C
4,100 @
375°F
45
45
5/8”x8” Q
5/8”x2” TC
1”x3” PG
1/2”x12” AE
3M™ Hot Melt Adhesive
3779
3789
350-385°F/
177-196°C
7,000 @
375°F
25
75
5/8”x8” Q
5/8”x2” TC
1”x3” PG
1/8” Bulk
3797
350-385°F/
177-196°C
2,650 @
375°F
30
55
5/8”x2” TC
1”x3” PG
350-385°F/
177-196°C
5,200 @
375°F
50
70
5/8”x8” Q
1”x3” PG
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 maximu m 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.
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.
3747
Heat Resistance
1
Ball & Ring Melt
Point
2
Shear Strength
3
Peel Strength
4
UL94 Listing
FDA Indirect
Food Contact
5
145°F/ 63°C
220°F/ 104°C
430 psi
20 piw
n/a
21 CFR
175.105
3M™ Hot Melt Adhesive
3779
3789
300°F/ 149°C
325°F/ 163°C
700 psi
18 piw
V0
21 CFR
175.105
220°F/ 104°C
270°F/ 132°C
570 psi
16 piw
V2
21 CFR
175.105
3797
170°F/ 77°C
304°F/ 151°C
350 psi
10 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).
3M™ Hot Melt Adhesive
3747 • 3779 • 3789 • 3797
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. How ever, many factors beyond 3M’s control can affect
the use and performance of a 3M product in a particular application, including the conditions under
w hich the product is used and the time and environmental conditions in w hich the product is expected to
perform. Since these factors are uniquely within the user’s know ledge and control, it is essential that the
user evaluate the 3M product to determine w hether 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 w arrants 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 P
ARTICULAR 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
w arranty period, your exclusive remedy and 3M’s and seller’s sole obligation w ill be, at 3M’s option, to
replace the product or refund the purchase price.
Limitation of Liability
Except w here prohibited by law, 3M and seller w ill not be liable for any loss or damage arising from the
3M product, w hether direct, indirect, special, incidental or consequential, regardless of the legal theory
asserted, including w arranty, 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.
3
Industrial Adhesives and Tapes Division
3M Center, Building 225-3S-06
St. Paul, M N 55144-1000
800-362-3550 • 877-369-2923 (Fax)
www.3M .com/Adhesives
3M is a trademark of 3M. Printed in U.S.A.
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