This table is a side-by-side comparison of fiberglass pipe insulation products was updated 10/1/19. Scroll to bottom or click here for copies of the data sheets.

Test/StandardProperty/DescriptionKnauf Insulation Earthwool® 1000Manson Insulation Alley-K®Owens Corning® SSL-II® w/ASJ Max Fiberglas®Johns Manville Micro-Lok®Johns Manville Micro-Lok HPJohns Manville Micro-Lok HP Ultra
ASTM C411Service Temperature0°F - 1000°F0°F - 1000°F0°F - 1000°F0°F - 850°F0°F - 850°F0°F - 850°F
ASTM C1104Moisture Sorption< 5% by weight< 5% by weight< 5% by weight< 5% by weight< 5% by weight< 5% by weight
ASTM C665Effect on CorrosionNo AccelerationNo AccelerationNo AccelerationNo AccelerationNo AccelerationNo Acceleration
ASTM C1617Effect on CorrosionPassPass
ASTM C1136Jacket Temp. Limits-20°F - 150°F-20°F - 150°F-20°F - 150°F-20°F - 150°F-20°F - 150°F-20°F - 150°F
ASTM E96Water Vapor Permeance.01 perm.02 perm.01 perm.02 perm.02 perm.01 perm
ASTM C1338Microbial GrowthPassPassPassPassPassPass
ASTM D774/D774MBurst Strength100 PSI55 PSI55 PSI100 PSI
TAPPI T803 (Beach Units)Burst StrengthMin. Rating of 50
UL723, ASTM E84 or CAN/ULC-S201Flame Spread/Smoke Developed25/50 Pass25/50 Pass25/50 Pass25/50 Pass25/50 Pass25/50 Pass
GREENGUARD®Low Chemical Emissions UL 2818CertifiedCertifiedCertifiedCertifiedCertifiedCertified
GREENGUARD® GOLDLow Chemical Emissions UL 2818CertifiedCertifiedCertifiedCertifiedCertifiedCertified
UL EnvironmentValidated Formaldehyde FreeCertifiedCertified
UL EnvironmentCertified Environmental Product DeclarationCertifiedCertified
SGC Global ServicesMinimum Average Recycled Content53%41%41%
SGC Global ServicesMinimum Pre-Consumer Recycled31%
SGC Global ServicesMinimum Post-Consumer Recycled45%45%22%32%33%
ASTM C547 Type I Grade AMineral Fiber Pipe InsulationCompliesCompliesCompliesCompliesCompliesComplies
ASTM C547 Type IV Grade BMineral Fiber Pipe InsulationCompliesCompliesComplies
ASTM C585Dimensions for Nominal Size Pipe and TubingCompliesCompliesCompliesCompliesCompliesComplies
ASTM C795Use on Austenitic SSCompliesCompliesCompliesCompliesCompliesComplies
ASTM C1136 Type ILow Retardance V/B for Thermal InsulationCompliesCompliesCompliesCompliesCompliesComplies
ASTM C1136 Type IILow Retardance V/B for Thermal InsulationCompliesCompliesCompliesCompliesComplies
ASTM C1136 Type IIILow Retardance V/B for Thermal InsulationCompliesCompliesCompliesComplies
ASTM C1136 Type IVLow Retardance V/B for Thermal InsulationCompliesCompliesComplies
ASTM C1136 Type VLow Retardance V/B for Thermal InsulationComplies
ASTM C1136 Type VIILow Retardance V/B for Thermal InsulationComplies
ASTM C1136 Type VIIILow Retardance V/B for Thermal InsulationComplies
ASTM C1136 Type XLow Retardance V/B for Thermal InsulationComplies
NRC 1.36Nonmetallic Thermal Insulation for Austenitic SSCompliesCompliesCompliesCompliesCompliesComplies
MIL-I-24244(Ships) Insulation Material with Special Corrosion,
Chloride, and Fluoride Requirements
CompliesComplies
MIL-I-24244C (supercedes MIL-I-24244)(Ships) Insulation Material with Special Corrosion,
Chloride, and Fluoride Requirements
CompliesCompliesCompliesCompliesComplies
MIL-DTL-24244D (supercedes MIL-I-24244C)(Ships) Insulation Material with Special Corrosion,
Chloride, and Fluoride Requirements
CompliesCompliesCompliesComplies
MIL-I-22344DInsulation, Pipe Thermal Fibrous GlassCompliesCompliesComplies
MIL-PRF-22344E (supercedes MIL-I-22344D)Insulation, Pipe Thermal Fibrous GlassCompliesCompliesCompliesComplies
MIL-DTL-32585No Types DefinedCompliesCompliesComplies
MIL-DTL-32585Type I, Form 1 Facing ACompliesCompliesComplies
MIL-DTL-32585Type I, Form 4 Facing DCompliesComplies
NFPA 90ACombustibilityCompliesCompliesCompliesCompliesComplies
NFPA 90BCombustibilityCompliesCompliesCompliesCompliesComplies
NFPA 258CombustibilityComplies
NFPA 259CombustibilityComplies

Alley-K®

SSL-II® w/ASJ Max Fiberglas®

Micro-Lok®

Micro-Lok® HP

Micro-Lok® HP Ultra