Scotch
Varnished Cambric Tapes
2510 and 2520
®
Data Sheet
Product
Description
June 2016
Scotch
®
Varnished Cambric Tapes are made from straight-cut woven cotton cambric fabric. The
fabric is oil primed and coated with a high-grade yellow electrical insulating varnish. Varnished
cambric tapes are flexible, electrically insulating and moisture resistant with a smooth finish.
Scotch
®
Varnished Cambric Tape 2510 is yellow, non-adhesive coated and 7 mils thick. Scotch
®
Varnished Cambric Tape 2520 is yellow with a pressure-sensitive adhesive and 8 mils thick.
They are designed to perform continuously in temperatures up to 105°C (220°F) with excellent
resistance to abrasion, puncture and cut-through. The adhesive on Scotch
®
Varnished Cambric
Tape 2520 holds the tape in position after application.
•
Excellent dielectric strength.
•
Electrical properties are stable up to 105°C.
•
High puncture and cut-through resistance.
•
Varnished cambric tapes are rated for Class A (105°C).
•
Non-corrosive adhesive on Scotch
®
Varnished Cambric Tape 2520. Adhesive holds film in
position until the jacket is applied.
Applications
For insulating joints requiring rapid and clean re-entry such as motor lead and service drop
connections, heavy split- bolts in raceways and bus bar insulating. Use in areas where mechanical
protection and puncture resistance is critical.
Note: Scotch Varnished Cambric Tapes 2510 and 2520 should not be used as primary insulation
for splicing and terminating PILC Cable
Contact your 3M Electrical Markets Division Representative for product
recommendation for splicing and terminating PILC Cable
Specifications
Scotch Varnished Cambric Tapes shall be based on straight- cut woven cotton cambric fabric. It shall
be coated to a specified thickness, with high grade yellow electrical insulating varnish producing a
visibly smooth surface.
The surface shall be free from peeling, blisters, contamination and other imperfections. Finished
product thickness shall be controlled to plus or minus 1 mil. Tapes must unwind freely (except
adhesive – backed) with no binding between tape layers.
Yellow, dry-finish varnished cambric tape shall be wax- dipped to preserve electrical properties.
Installation
Techniques
Apply Scotch Varnished Cambric Tape 2510 and 2520 in half-lapped layers with sufficient tension to
conform to the connection surface. Apply a minimum of two half-lapped layers for mechanical
protection.
Jacket all varnished cambric applications with Scotch Rubber and Vinyl Splicing Tapes to provide a
contamination and moisture seal.
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Scotch
®
Varnished Cambric Tapes 2510 and 2520
Typical
Physical
and Electrical
Properties
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
Physical Properties (Test Method)
Color
Surface Finish
Thickness
(ASTM D 374)
Tensile Strength
(ASTM D 295)
Adhesion to Steel
(ASTM D 1000)
Adhesion to Backing
(ASTM D 1000)
Thermal Stability
Solvent Resistance
Oil Resistance
Electrical Properties (Test Method)
Dielectric strength
(ASTM D 295)
2510
Yellow
Dry
7 mils
50 ils./in.
-
-
Class A
Excellent
Excellent
2510
800 V/mil
2520
Yellow
Dry with Adhesive
8 mils
50 ils./in.
13 oz./in.
8 oz./in.
Class A
Excellent
Excellent
2510
800 V/mil
Shelf Life &
Storage
Scotch
®
Varnished Cambric Tapes 2510 and 2520 have a 5-year shelf life (from date of
manufacture) when stored under the following recommended storage conditions. Store behind
present stock in a clean dry place at a temperature of 70°F and 40% to 50% relative humidity.
Proper stock rotation is recommended.
Availability
Scotch
®
Varnished Cambric Tapes 2510 and 2520 are available from your local 3M authorized
distributor.
Available from 3M.com/electrical [Where to Buy] or call 1.800.245.3573.
3M
and Scotch are trademarks of
3M Company.
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.
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 direct, indirect, special, incidental or consequential loss or damage
arising from this 3M product, regardless of the legal theory asserted.
Warranty;
Limited Remedy;
Limited Liability
Electrical Markets Division
6801 River Place Blvd.
Austin, TX 78726-9000
800.245.3573
FAX: 800.245.0329
www.3M.com/electrical
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