Earthwool® Pipe and Tank Insulation

Earthwool® Pipe and Tank Insulation

Knauf Insulation Earthwool® Pipe and Tank Insulation with ECOSE® Technology is a semi-rigid glass mineral wool board in roll form faced with a factory applied FSK or ASJ vapor retarder or a glass mat facing. The glass fibers are adhered perpendicular to the jacketing, for flexibility and easy installation.

ECOSE® Technology

ECOSE Technology is a revolutionary binder chemistry that enhances the sustainability of our products. The “binder” is the bond that holds our glass mineral wool product together and gives the product its shape and brown color. ECOSE Technology is a plant-based, sustainable chemistry that replaces the phenol/formaldehyde (PF) binder traditionally used in glass mineral wool products. Products using ECOSE technology are formaldehyde-free and have reduced global warming potential when compared to our products of the past.


Knauf Pipe and Tank Insulation with ECOSE Technology is typically used on tanks, vessels and large-diameter pipes. It can be used for any curved or irregular surfaces that require finished characteristics of rigid glass mineral wool insulation.

Features and Benefits

Excellent Thermal Properties

  • Temperature ratings to 850°F (454°C).

Low-Cost Installation

  • Flexible.
  • Easy to handle and fabricate.

Inventory Savings

  • No need to stock multiple sizes.
  • Various thicknesses available to meet all your pipe and tank insulation needs.

Resists Damage

  • Tough and durable.
  • Resists damage in shipment, during and after installation.

Resists Microbial Growth

  • Does not promote the growth of fungi or bacteria.
  • Will not rot.
  • Will not sustain vermin.

Corrosiveness (ASTM C 665)

Does not accelerate corrosion on steel, copper or aluminum.

Corrosion (ASTM C 1617)

  • The corrosion rate in mils/yr will not exceed that of the 1 ppm chloride solution.

Specification Compliance

  • ASTM C 1136
    • Type I, II, III, IV (ASJ)
    • Type II, IV (FSK)
  • HH-B-100B (jackets)
    • Type I and II (ASJ)
    • Type II (FSK)
  • HH-I-558C; Form A, Class 3

Technical Data

Temperature Range (ASTM C 411)

  • Operating temperature to 850°F (454°C).

Compressive Strength (ASTM C 165)

  • Not less than 150 PSF (7.18 kPa) at 10% deformation for 2" (51 mm) thickness.
  • Not less than 275 PSF (13.2 kPa) at 10% deformation for 3" (76 mm).

Water Vapor Transmission (ASTM E 96, Procedure A)

  • Both FSK and ASJ vapor retarders have a maximum vapor transmission rate of .02 perms.

Puncture Resistance (TAPPI Test T803) (Beach Units)

  • FSK Facing: 25
  • ASJ facing: 50

Surface Burning Characteristics

  • Does not exceed 25 Flame Spread, 50 Smoke Developed when tested in accordance with ASTM E 84, NFPA 255 and UL723.

Linear Shrinkage (ASTM C 356)

  • Negligible.

Application & Specification Guidelines


  • ASJ and FSK jackets should not be used if outer-surface temperature exceeds150°F (66°C).
  • During initial heat-up to operating temperatures above 350°F (177°C), a slight odor and some smoke may be given off as a portion of the bonding material used in the insultion begins to undergo a controlled decomposition.
  • If natural convection is not adequate in confined areas, forced ventilation should be provided in order to protect against any harmful fumes and vapors that might be generated.
  • Care must also be taken when using sealants, solvents or flammable adhesive during installation.


  • Protect stored insulation from water damage or other abuse.
  • Protect from welding sparks and open flame.
  • Cartons are not designed for outside storage.


  • Apply Knauf Pipe and Tank Insulation on clean, dry surfaces.


  • For easy installation of Knauf Pipe and Tank Insulation simply follow these guidelines.
  • Refer to the Stretch-out Chart (right) to find the appropriate length to cut for the specific pipe size. Be sure to add an additional 2" (51 mm) to 4" (102 mm) for your staple flap.
  • Cut your stretchout length and wrap the material around the iron pipe to ensure the proper fit.
  • Staple the lap on 3" (76 mm) centers with outward clinching staples.
  • Butt edges shall be firmly secured, and butt strips matching the jacket shall be applied at each joint.


Glass mineral wool may cause temporary skin irritation. Wear long-sleeved, loose-fitting clothing, head covering, gloves and eye protection when handling and applying material. Wash with soap and warm water after handling. Wash work clothes separately and rinse washer. A disposable mask designed for nuisance type dusts should be used where sensitivity to dust and airborne particles may cause irritation to the nose or throat.

Glass Mineral Wool and Mold

Glass mineral wool insulation will not sustain mold growth. However, mold can grow on almost any material when it becomes wet and contaminated. Carefully inspect any insulation that has been exposed to water. If it shows any sign of mold it must be discarded. If the material is wet but shows no evidence of mold, it should be dried rapidly and thoroughly. If it shows signs of facing degradation from wetting, it should be replaced.


The chemical and physical properties of Knauf Pipe and Tank Insulation with ECOSE Technology represent typical average values determined in accordance with accepted test methods. The data is subject to normal manufacturing variations. The data is supplied as a technical service and is subject to change without notice. References to numerical flame spread ratings are not intended to reflect hazards presented by these or any other materials under actual fire conditions. Check with your Knauf Insulation sales representative to assure information is current.