Manson Alley-K Fiberglass Pipe Insulation

ALLEY-K is a preformed fiberglass pipe insulation composed of high quality glass fibers, bonded together with a thermosetting resin. The 36” pipe sections are available with or without the all service jacket (ASJ). Our all service vapor retarder jacket (ASJ) reinforced with glass fibers comes with a factory applied pressure sensitive self-sealing lap closure system (SSL). Butt strips are also supplied.

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Product Description


Manson Insulation fiberglass pipe insulation is intended as a thermal insulation for hot and cold service piping. Typical uses include domestic hot and cold water, hot water heating, high temperature, dual temperature, steam, condensate and refrigerated lines. As a component of a suitable insulation system, plain ALLEY-K Pipe Insulation may be used for light industrial applications, while ALLEY-K with ASJ jacket may be used for commercial and institutional usage.


Manson Insulation products with ECOSE Technology are made using our patented, bio-based binder – a smarter alternative to the phenol/formaldehyde (PF) binder traditionally used in fiberglass products. The bio-based binder holds our product together and gives the product its unique appearance.

All of our products are formaldehyde-free and made from sustainable resources , such as recycled glass and sand. And we’re proud to be putting glass bottles back to work rather than into landfills. Our products are made with a minimum of 50% recycled glass—totaling an average of 26 million bottles each month.


  • UL Environment
  • GREENGUARD Certified
  • GREENGUARD Gold Certified
  • Validated to be Formaldehyde-Free
  • Does not contain polybrominated diphenyl ethers (PBDE) such as Penta-BDE, Octa-BDE, or Deca-BDE
  • IgCC Section 806.6 Compliant
  • EUCEB certified 


  • ASTM C547; Type I, Type IV
  • ASTM C585
  • MIL-DTL-32585; Type I, Form 4, Facing A and D
  • UL/ULC Classified
  • USCG 164.109/A4/0
  • ASTM C795
  • MIL-I-24244
  • NRC Reg. Guide 1.36
    (Certification needs to be specified at the time of the order)


  • L 723/ASTM E84
  • CGSB 51-GP-52M
  • ASTM C1136; Type I, II
  • NFPA 90A and 90B


  • Greenguard Certification
    – Greenguard GOLD certified for superior indoor air
    quality performance
    – Over 50% post-consumer recycled glass
    This product is tested and certified to meet EUCEB requirements.


Property                                                                  Test                                                                   Performance
Corrosiveness                                                        ASTM C665                                                      Does not accelerate corrosion of steel
Corrosion                                                                ASTM C1617                                                    Pass
Linear Shrinkage                                                    ASTM C356                                                      Less than 0.3%
Maximum Service Temperature                            C411                                                                1000° F (538° C)
Water Vapor Sorption (by weight)                        ASTM C1104                                                    Less than 5%
Water Vapor Permeance                                       ASTM E96                                                        0.02 perms
Puncture Resistance                                            TAPPI T803, Beach Units                                 Min. rating of 50
Microbial Growth                                                  ASTM C1338                                                     Pass
Surface Burning Characteristics                         ASTM E84, UL 723, CAN/ULC S102                UL/ULC Classified FHC 25/50 
(flame spread/smoke developed)

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General Insulation Company is a B2B distributor – supplier with over 50 locations across the U.S. that stocks and fabricates a wide variety of mechanical fiberglass pipe insulation products for commercial, industrial, and residential construction markets.

Manson Alley-K Pipe Insulation Technical Data Sheet

Manson Alley-K Pipe Insulation Safety Data Sheet

Alley K Environmental Transparency Report

Alley K Recycled Content Validation Summary