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Application Profile

Market: Construction

Application Description: Splicing together fiberglass web in the manufacture of asphalt shingles and roofing materials.

Application Method


Manual operation where the mat materials are cut and a 4” – 6” wide piece of

3MThermosetable Glass Cloth

365 or 3650 is applied. Heat is applied either by hand or may be automated.

Tape 365 and 3650


Key Application Requirements

Splicing material that has equal or greater tensile than the fiberglass mat. Low profile. Must be able to make splice quickly (~ 30 - 90 seconds) Strength of bond must equal or exceed tensile of fiberglass mat. Reliable splice at temperatures up to 400ºF. Splice material is attached over entire surface of glass mat so entire surface is coated. Material must be coatable with asphalt mixture. For high slope shingles where rotary cutting is employed, it is best if carbide blades are used on the tool vs. tooled steel, particularly in operations with high through-put.

Benefits/Advantages To Customer

Superior reliability: Splices made with 3MThermosetable Glass Cloth Tapes 365 and 3650 have superior reliability compared to hot melt glue splices, particularly in “bath” coating operations.

Lower Profile: 3M™ Thermosetable Glass Cloth Tape provides a thinner splice than an overlapping glue splice, resulting in less change to finished shingle profile.

Resists moisture: Butt splices made with 3M tape provide complete adhesive coverage for the spliced web leaving no overlapping uncoated mat to absorb moisture.

Helps reduce maintenance: Use of tape eliminates the use of hot melt glue guns, eliminating the time needed to clear plugged nozzles and routine maintenance time for glue gun heads.

Tensile strength: Tensile strength of the 3M tape and the finished spliced

produced is greater than that of the fiberglass web.

3M Industrial Business

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