Manson AK Flex Fiberglass Pipe & Tank Insulation

  • Pipe and tank insulation
  • 48’’ wide semi-rigid glass mineral wool blanket
  • Roll form
  • Available plain or with a factory applied ASJ or FSK vapor retarder jacket

Glass Mineral Wool Equipment, Pipe & Tank Insulation

AK FLEX™ pipe and tank insulation is a 48″ wide semi-rigid fiberglass blanket, 2.5 pcf density, in roll form. It is available plain or faced with a factory-applied ASJ or FSK vapor retarder jacket. The fiber orientation provides excellent compressive strength while maintaining flexibility for ease of installation.


MANSON AK Flex™ pipe and tank insulation is typically used on tanks, vessels and large-diameter (greater than 10″) pipes. It can be used for any curved or irregular surfaces that require finished characteristics of rigid glass mineral wool insulation.

Product Description


  • Greenguard Certification
    Over 50% post-consumer recycled glass
    This product is tested and certified to
    meet EUCEB requirements.
  • Water Vapor Transmission (ASTM E 96, Procedure A)
    FSK & ASJ vapor retarders have maximum vapor transmission rate of
    .02 perms
  • Water Vapor Sorption (ASTM C 1104)
    Less than 5% by weight when exposed to air at 120°F (49°C)
    and 95% humidity for 96 hours
  • Shrinkage (ASTM C 356)
    Less than 0.3% linear shrinkage
  • Microbial growth (ASTM C 1338)
    Does not promote or support the growth of mold, fungi or bacteria
  • CGSM 51-GP-10M
    Canadian specification for mineral fiber board insulation
  • Fire hazard classification
    – (UL 723, CAN/ULC-S102-M-88, ASTM E84, NFP90A & 90B)
    – Flame spread index not exceeding 25 and smoke developed
    index not exceeding 50
  • Corrosiveness (ASTM C 665)
    Will not accelerate corrosion of aluminum, steel or copper

Manson AK Flex Fiberglass Pipe & Tank Insulation Technical Data Sheet

Manson AK Flex Fiberglass Pipe & Tank Insulation Safety Data Sheet