Pipe Insulation

Pipe Insulation

Knauf Insulation Pipe Insulation is a molded, heavy-density, one-piece insulation made from inorganic glass strands bonded with ECOSE® Technology. It is produced in 1.2m lengths with or without a factory-applied jacket.

Knauf Insulation Pipe Insulation is a molded, heavy-density, one-piece insulation made from inorganic glass strands bonded with ECOSE® Technology. It is produced in 1.2m lengths with or without a factory-applied jacket.

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 Insulation Pipe Insulation is used to insulate iron and copper piping in industrial applications and in commercial and institutional buildings. Knauf Insulation Pipe Insulation is suitable for hot, cold, concealed and exposed piping systems operating at temperatures from -18°C to 232°C (0°F-450°F). Additional weather protection is needed outdoors.

Features and Benefits

Energy Conservation

  • Offers excellent resistance to heat loss or gain, which saves energy and lowers operating costs.
  • A low thermal conductivity of .33 at  24°C(75°F).

Low-Cost Installation

  • Fast, easy installation reduces labor costs.

Condensation Control

  • Installed properly, the foil vapor retarder and pressure-sensitive lap assure a positive vapor seal.

UL Classified

  • All Knauf Insulation Pipe Insulation, plain or jacketed, meets the fire and smoke safety requirements of most federal, state, and local building codes.

Indoor Air Quality

  • Certified by EUROFINS Indoor Air Quality - Gold Certificate as low emitting products and verified to be formaldehyde-free.


  • Carbon negative: meaning Knauf Insulation products used for thermal insulating purposes recover the energy that it took to make them in just hours or a few days, depending on the application. Once installed, the product continues to save energy and reduce carbon generation as long as it is in place.

Earthwool glass mineral wool insulation contains three primary ingredients:

  • Sand, one of the world’s most abundant resources
  • Minimum 50% post-consumer recycled bottle glass
  • ECOSE Technology which reduces binder embodied energy by up to 70%
  • It is anticipated to reduce its Global Warming Potential (GWP) by approximately 4%, a significant reduction in our carbon footprint.

Specification Compliance

  • ASTM C 547; Type I, Type IV
  • ASTM C 585
  • ASTM C 795
  • ASTM C 1136 (jackets); Type I, II, III, IV, VIII
  • HH-I-558C; Form D, Type III, Class 12; Class 13 (to 1000°F, 538°C)
  • EUROFINS Indoor Air Quality - Gold Certified
  • NFPA 90A and 90B

Technical Data

Surface Burning Characteristics

  • UL Classified.
  • Does not exceed 25 Flame Spread, 50 Smoke Developed when tested in accordance with ASTM E 84, NFPA 255, and UL 723

Temperature Range (ASTM C 411)

  • Pipe operating temperatures from -18°C to 232°C (0°F-450°F)

Water Vapor Permeance (ASTM E 96, Procedure A)

  • Jacket has a water vapor permeance of .02 perms or less.

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 1ppm chloride solution.

Microbial Growth (ASTM C 1338)

  • Does not promote microbial growth.

Water Vapor Sorption (ASTM C 1104)

  • Less than 0.2% by volume.

Linear Shrinkage (ASTM C 356)

  • Negligible.


  • Four convenient carton sizes for easy ordering, inventory tracking, and storage.
  • Reinforced carton handles for strength and easy lifting.
  • Bar-coded cartons for accurate shipments and tracking.
  • Full product range stocked at distributors for fast availability.


Hot Pipe

  • May be installed while the system is in operation, at all temperatures up to  538°C(1000°F).
  • Knauf Insulation recommends, for insulation thicknesses greater than 152 mm (6"), the temperature must be increased from  260°C (500°F) to maximum temperature at a rate not exceeding 56°C (100°F) per hour.
  • During initial heat-up to operating temperatures above 177°C (350°F), a slight odor and some smoke may be given off as a portion of the bonding material used in the insulation 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 adhesives during installation.
  • A maximum of  152 mm(6") wall thickness is recommended. 

Cold Pipe

  • Use a continuous vapor retarder on piping operating below ambient temperatures.
  • Seal all joints, surfaces, seams, and fittings to prevent condensation. Use of staples is not recommended.
  • On below freezing applications, and in high abuse areas, the facing jacket shall be protected with a PVC vapor retarding outer jacket. In addition, exposed ends of insulation shall be sealed with vapor barrier mastic installed per the mastic manufacturer's instructions. Vapor seals at butt joints shall be applied at every fourth pipe section joint and at each fitting to isolate any water incursion.
  • On chilled water systems operating in high humidity conditions, it is recommended that the same guidelines be followed as listed above for below freezing applications.
  • Exterior hanger supports are recommended.

Outside Application

  • Do not expose pipe insulation to weather. It must be covered with appropriate jacketing, mastic, or vapor retardant adhesives.
  • All exposed surfaces must be protected. PVC Jacketing is recommended. See Knauf Insulation Guide Specifications for recommended PVC jacketing application guidelines.
  • Apply jacketing, mastics or vapor retardant adhesives per manufacturer's instructions. For metallic jackets, factory-applied and condensate retarders are recommended.

Additional Precautions

  • 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.
  • Use a disposable mask/respirator designed for nuisance-type dusts where sensitivity to dust and airborne particles may cause irritation to the nose or throat.

Application Guidelines


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


  • Apply only on clean, dry surfaces.
  • Pipe or vessel should be tested and released before insulation is applied.

General Guidelines

  • All sections should be firmly butted.
  • Seal circumferential joint with a minimum 76 mm (3") wide butt-strip.
  • Jackets, coatings, and adhesives should have a comparable F.H.C. rating.
  • All piping should have continuous insulation.
  • Position longitudinal lap downward to avoid dirt and moisture infiltration.
  • Do not expose pipe insulation to excessive vibration or physical abuse.

Butt Strip Installation Instructions:

  1. To install Butt Strips, remove the kraft release liner by separating the butt strip from the kraft using the convenient, easy release kiss cut.
  2. Simply wrap the butt strip, centered around the joint, and apply firm pressure with a squeegee.

NOTE: After initial Butt Strip adhesive tack, it is critical that the closure is not re-opened and repositioned on the facing.  Doing so will weaken the adhesive and diminish bond strength.

Recommended Thicknesses (ASHRAE 90.1-2010)

The minimum thicknesses are based on ASHRAE 90.1-2010 standards and do not necessarily represent the Economic Thickness of Insulation or the thickness required for proper condensation control. Rather, they serve as minimum recommendations for commercial applications. For recommended Economic Thickness, install according to Knauf Insulation or NAIMA 3E Plus programs or as specified.

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 Insulation Pipe Insulation 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.