Datasheet

ManualsBrands3M ManualsAdhesive TapesSelf-Fusing Tape, 25mm x 9m, Grey

70 Self-Fusing Silicone Rubber

Electrical Tape

Data Sheet

1.0 Product Description

Scotch™ Brand 70 Silicone Rubber

Electrical Tape is a high-temperature arc-

and track-resistant tape composed of self-

fusing, inorganic silicone rubber and easy-

tear and easy-strip liner.

Tape features:

• Excellent track resistance.

• Excellent arc resistance.

• Excellent ozone resistance.

• High dielectric strength.

• Class “H” material (180°C continuous

operation).

• Workable at extremely low temperatures.

• Excellent conformability.

• Excellent instantaneous fusion; does not

need to be held down.

• Matches Sky Blue Gray Munsell

5BG7.0/0.4.

• Excellent weathering characteristics.

• AA-59163 Class-I Type-I.

2.0 Applications

• As an overwrap for protection of

terminating high-voltage cables against

arcing and tracking. High-voltage cables

with these insulations should be

overwrapped:

Butyl rubber

Oil-base rubber

Ethylene propylene rubber

P.V.C.

Low and high-density polyethylene

cross-linked

78-8126-0479-7-A

• As primary insulation where Class “H”

(180°C/356°F) temperatures are

encountered i.e., silicone rubber cables.

• As splice overwrap on spacer cable

operating at 15 kV and above.

3.0 Data

Scotch 70 Tape has a thickness of 12 mils

and is available in roll size 1 in. wide x 30

ft. long. The core is 1 in. I.D.

4.0 Specifications

Product

The insulating tape must be composed of

self-fusing, inorganic silicone rubber with an

easy-tearing and easy-stripping polyester

liner. The product must be Sky Blue Gray

and conform to Munsell Color No.

5BG7.0/0.4. The tape must be capable of

operating continuously at Class H

temperatures (180°C/356°F). The tape must

be compatible with all synthetic cable

insulations as well as cable splicing

compounds.

Engineering/Architectural Specifications

All tape or tape-like terminations which will

be operated either outdoors or in areas

subjected to contamination or moisture shall

be overwrapped with at least one layer of

Scotch 70 Silicone Rubber Electrical Tape.

The exposed cable insulation on the lug side

of assembled stress cone kits, which will be

Summary of content (4 pages)

PAGE 1
70 Self-Fusing Silicone Rubber Electrical Tape Data Sheet 1.0 Product Description • Scotch™ Brand 70 Silicone Rubber Electrical Tape is a high-temperature arcand track-resistant tape composed of selffusing, inorganic silicone rubber and easytear and easy-strip liner. • Tape features: • Excellent track resistance. • Excellent arc resistance. • Excellent ozone resistance. • High dielectric strength. • Class “H” material (180°C continuous operation). • Workable at extremely low temperatures.
PAGE 2
operated either outdoors or in areas subjected to contamination or moisture, shall be overwrapped with at least one layer of Scotch 70 Silicone Rubber Electrical Tape. Dielectric Constant Table 2 shows the dielectric constant versus temperature of 70 Tape. This test was run according to ASTM-D-150-68 at a stress of 50 V/mil and a frequency of 60 cycles per second. All splices on spacer cable operating at 15 kV and above shall be overwrapped with Scotch 70 Silicone Rubber Electrical Tape.
PAGE 3
Figure 1 4. Allow the termination to air-dry in the upright position before applying the voltage. This method, when tested on various surfaces including silicone rubber and glazed porcelain, has repeatedly produced a coating thickness of from 0.12 to 01.15 grams per square inch of surface. The terminations are then tested in a contamination building. All terminations are mounted vertically. The uniform fog rate called out in ASTM-D-2132 is obtained by the use of special atomizing, wide-angle nozzles.
PAGE 4
7.0 Installation Techniques NOTE REGARDING LINER REMOVAL: Scotch 70 Silicone Rubber Electrical Tape should be applied in half-lap layers using moderate tension. To separate the liner from the tape when starting a new roll, simply stretch the liner and tape until the silicone tape breaks. The liner will then separate at this point. 70 Tape should be applied on all tape-like terminations which will be operated either outdoors or in areas subjected to contamination or moisture.