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Aluminum Foil Tape
425 •427
Product Description 3M™ Aluminum Foil Tapes 425 and 427 are 5 mil nominal dead soft aluminum foil
backing combined with a transparent acrylic adhesive. 3M aluminum foil tape 427
offers an easy-release liner.
Typical Physical
Properties
Features • Flame resistant. Meets U.L. 746C (File E 122798) and 723, Class “L” low
flammability rating (File R 7311).
•3M aluminum foil tape 425 can be certified to meet SAE-AMS-T-23397 and L-T-80B.
• Meets requirements of F.A.R. 25.853(a).
• The very low moisture vapor transmission rate makes these tapes a good sealant.
• The acrylic adhesive, combined with the durable aluminum backing, offers ideal
properties for long serviceable life in and outdoors.
• Good candidate as a maskant in electroplating of aluminum because it will not
contaminate the bath.
• Aluminum backing provides excellent reflection of both heat and light.
• Best results obtained when applied to a clean, dry surface above 32°F (0°C).
Technical Data April, 2008
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
ASTM Test Method
Adhesion to Steel: D-3330
3M aluminum foil tape 425 47 oz./in. width (51 N/100 mm)
3M aluminum foil tape 427 50 oz./in. width (55 N/100 mm)
Tensile Strength: 30 lbs./in. width (525 N/100 mm) D-3759
Backing Thickness: 2.8 mils (0.07 mm) D-3652
Total Tape Thickness: 4.6 mils (0.12 mm) D-3652
Liner Thickness: D-3652
3M aluminum foil tape 427 3.1 mils (0.08 mm)
Elongation at Break: 8% D-3759
Temperature Use Range: -65° to 300°F (-54° to 149°C)
Water Vapor 0.1g H2O/100 sq. in./24 hrs. D-3833
Transmission Rate: (1.55 g/m2/24 hrs.)
Approximate Weight: 0.013 lbs./yd./in. width (4.77 gms/m/24 mm)
Product Construction
Backing Adhesive Color Liner Standard Roll Length
Dead soft Acrylic Shiny silver Easy-release paper 60 yds. (55 m)
aluminum (3M aluminum foil tape 427)
IMPORTANT: These tapes are not intended for medical usage. Neither 3M nor the Food and Drug
Administration have evaluated or reviewed this tape for medical application. 3M does not recommend
or endorse the usage of the aluminum tape for medical application. User assumes all risk and liability
whatsoever in connection with usage of product in a medical application.
Application Ideas • Aircraft paint stripping maskant.
• Moisture barrier in “white goods” appliances.
• General purpose heat reflector and heat dissipator.
• Mechanically hold wires and cooling coils in “white goods” appliances.
• Repair tears on truck trailers and aircraft.
• Splicing of thin gauge foils.
• General purpose holding, patching, sealing applications – indoors and out.
3M™Aluminum Foil Tape
425 • 427
Storage Store under normal conditions of 60° to 80°F (16° to 27°C) and 40 to 60% R.H. in
the original carton.
Shelf Life To obtain best performance, use this product within 24 months from date of
manufacture.
The technical information, recommendations and other statements contained in this document are
based upon tests or experience that 3M believes are reliable, but the accuracy or completeness of such
information is not guaranteed.
Technical Information
Many factors beyond 3M’s control and uniquely with user’s knowledge and control can affect the use
and performance of a 3M product in a particular application. User is solely responsible for evaluating the
3M product and determining whether it is fit for a particular purpose and suitable for user’s method of
application. Unless an additional warranty is specifically stated on the applicable 3M product packaging
or product literature, 3M warrants that each 3M product meets the applicable 3M product specification at
the time 3M ships the product. 3M MAKES NO OTHER WARRANTIES OR CONDITIONS, EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OR CONDITION OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY
OR CONDITION ARISING OUT OF A COURSE OF DEALING, CUSTOM OR USAGE OF TRADE. If the
3M product does not conform to this warranty, then the sole and exclusive remedy is, at 3M’s option,
replacement of the 3M product or refund of the purchase price.
Warranty,
Limited Remedy,
and Disclaimer
Except where prohibited by law, 3M 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.
Limitation of Liability
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2000 standards.
ISO 9001:2000
3M is a trademark of 3M company.
Printed in U.S.A.
©3M 2008 70-0707-7622-7 (4/08)
Recycled Paper
40% pre-consumer
10% post-consumer
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Industrial Adhesives and Tapes Division
3M Center, Building 21-1W-10, 900 Bush Avenue
St. Paul, MN 55144-1000
800-362-3550 • 877-369-2923 (fax)
www.3M.com/industrial
