Foster® 85-70™ Spark-Fas® WB Adhesive | GLT Products

Foster 85-70 Spark-Fas WB Adhesive

Foster® 85-70™ Spark-Fas® WB Adhesive is a high tack, rapid setting water-based adhesive used to adhere fibrous glass or mineral wool insulations (up to 6 lbs. density) to painted or unpainted steel, galvanized or aluminum air-conditioning or hot air ducts. A synthetic elastomer emulsion, it is non-flammable when wet and extremely fire resistant when dry. Its consistency resists dripping and spattering.

SPARK-FAS WB Adhesive meets ASTM C 916, Type 1 (ASC-A-7001, Type 1) requirements. It meets MIL-A-3316C, Class 2, grade A requirements, and is listed on the QPL. Also, SPARK-FAS WB Adhesive meets NFPA 90A and 90B 25/50 requirements.


  • Ideal for bonding fibrous glass and rigid plastic foam insulations to wood, concrete or other materials of construction.
  • No asbestos, lead, mercury, or mercury compounds. 

 Suggested Use:

  • Attachment: Best
  • Duct Liner: Good

Insulation Type:

  • Fiberglass and Mineral Wool: Best
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