Fiberglass Insulation

Fiberglas™ Thermal Insulating Wool (TIW)


Fiberglas™ Thermal Insulating Wool (TIW) Types I-HP and II-HP Insulations are off-white non-combustible wool with resilient, inorganic glass fibers bonded with a thermosetting resin. TIW Type I-HP Insulation is available in rolls and TIW Type II-HP Insulation comes in batts.

Pipe and Mechanical Insulation Brochure PDF | 10.4 MB

Specifications and Literature

Technical Information

Physical Properties

Property Test Method Value
Equipment Operating Temperature Range 2 ASTM C411 Up to 1,000°F (538°C)
Nominal Density ASTM C167 1.0 pcf (16 kg/m3)
Water Vapor Sorption ASTM C1104 < 2.0% by weight at 120°F (49°C), 95% R.H.
Composite Surface Burning Characteristics
Flame Spread
Smoke Developed
UL 723, ASTM E84 or CAN/ULC-S102

Standards Codes Compliance

  • ASTM C553, Mineral Fiber Blanket Thermal Insulation, Types I, II, V – TIW Type I-HP; all types – TIW Type II-HP when specifi cation Type VII is limited to 1,000°F maximum use temperature.
  • ASTM C612, Mineral Fiber Block & Board Thermal Insulation, Types IA, II, III – TIW Type II-HP
  • ASTM C795, Thermal Insulation for Use Over Austenitic Stainless Steel 4
  • ASTM C1139, Fibrous Glass Thermal Insulation and Sound Absorbing Blanket and Board for Military Applications, Type 1, Grade 2 – TIW Type I-HP; Type 2, Grade 2 – TIW Type II-HP
  • Mil. Spec. MIL-I-22023D (Ships), Insulation Felt, Thermal and Sound Absorbing Felt, Fibrous Glass, Flexible, Types 1 & 2, Class 3 – TIW Type I-HP
  • Nuclear Regulatory Commission Guide 1.36, Non-Metallic Thermal Insulation 4
  • U.S. Coast Guard Approval No. 164.109, Noncombustible Materials
  • CAN/CGSB-51.11 – Type 1, Class 4 – Fiberglas™ TIW Types I-HP & II-HP Insulation

1. All values are approximate.

2. Maximum allowable thickness at 1,000°F (538°C): Type I-HP - 8.5" (216mm); Type II-HP - 6"(152mm).

3. The surface burning characteristics of these products have been determined in accordance with UL 723, ASTM E84 or CAN/ULC-S102. These should be used to measure and describe the properties of materials, products or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. Values are reported to the nearest 5 rating.

4. Preproduction qualification testing complete and on file. Chemical analysis of each production lot testing required for total conformance.


Mechanical Solutions

eBooks and Guides

Division 22/23 eBook

The Division 22/23 Mechanical Manufacturer’s Guide eBook is an easy-to-use tool that can be accessed anytime, anywhere to view duct, pipe and HVAC equipment insulation solutions, product data sheets, CSI MasterFormat® three-part system specifications and green building program guides.

3E Plus®

Owens Corning is proud to partner with 3E Plus® to deliver answers about using our insulation products in your business applications.

You can also download the 3E Plus® User Guide for any questions.

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