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Foster® Fibrous Adhesive 81-27™

1 of 184 products in this brand
Foster® Fibrous Adhesive 81-27™ is an incombustible adhesive formulated with sodium silicate. It is primarily designed for bonding calcium silicate and expanded perlite thermal insulation to both itself and non-porous surfaces. This adhesive provides exceptional adhesion, and ideal working characteristics, and ultimately forms a hard, incombustible film with a brittle texture.

Product Type: Adhesive, Cement Adhesive, Waterborne Adhesive

Application Method: Brush, Trowel

Features: Good Adhesion, Water-based

Technical Data SheetSafety Data Sheet

Enhanced TDS

Identification & Functionality

Product Type

Adhesive,

Cement Adhesive,

Waterborne Adhesive

Technologies

Adhesives & Sealants

Product Families

Adhesives & Sealants — Bonding & Sealing Chemistry

Cementitious Adhesive & Sealants

Adhesives & Sealants — Bonding Technology

Water-Based Adhesives

Features & Benefits

Labeling Claims

Asbestos-free,

Lead-free,

Mercury-Free

Ready-to-Use Product Features

Good Adhesion,

Water-based

Product Highlights
  • Fibrous Adhesive can also be used for lagging high temperature alkali resistant cloth on high temperature insulation.
  • Nuclear Grade Fibrous Adhesive 81-27Q can be supplied to meet the stress corrosion and chemical analysis requirements of MIL-I-24244C or Nuclear Regulatory Guide 1.36 on special order.
  • Fibrous Adhesive contains no asbestos, lead, mercury, or mercury compounds.
  • Fibrous Adhesive meets requirements for LEED IEQ 4.1 Low-Emitting Materials, Adhesives and Sealants.

Applications & Uses

Application Method

Brush,

Trowel

Limitations
  • Apply between 40°F and 100°F, protect from freezing until dry.
  • Since the dry adhesive film is soluble in water, it should not be used where moisture will be encountered.
  • Because of its sodium silicate base, this product is not recommended for use with glass fiber or other alkali sensitive insulations.
  • Primed or painted metal surfaces should be tested for compatibility.
  • If used between impermeable surfaces, drying time will be extended.
Preparation and Application Information

Material Preparation

  • Do Not Thin.
  • Stir well, but do not use sticks or boards which would splinter or otherwise contaminate the product.
  • Apply only to clean, dry, oil-free surfaces. Keep container closed when not in use.

Application 

  • Remove any dust from the surfaces to be bonded.
  • To both surfaces of insulation apply a coat of Foster® Fibrous Adhesive by brush or trowel at a coverage of 25 to 40 sq. ft./gal. (.61 - .98 m2 /l).
  • Allow an open time of 0 to 5 minutes to develop full tack.
  • Place the adhered surfaces together, applying pressure to assure complete and uniform contact.

Brush 

  • Use a clean paintbrush and apply evenly at recommended coverage. Bond immediately with firm pressure.

Trowel 

  • Use steel trowel. Apply evenly at recommended coverage. Bond immediately with firm pressure.

Clean Up 

  • Clean brushes and equipment with water.

Properties

Color

Beige

Physical Form

Liquid

Typical Properties
ValueUnitsTest Method / Conditions
Average Weight / U.S. Gallon13.7lbs.ASTM D1475
Average Non-Volatile (by Volume)41.0% ASTM D2369
Average Non-Volatile (by Weight)63.0% ASTM D2369
Coverage Range (Brush)40 - 50sq. ft./gal.FSTM 72
Coverage Range (Trowel)25 - 30sq. ft./gal.FSTM 72
Bonding Time Range0 - 5MinutesFSTM 66
Wet Flammability100.0°CASTM D93
Application Properties
ValueUnitsTest Method / Conditions
Service Temperature Limits (at coated surface)50 -100°F

Regulatory & Compliance

Chemical Inventories

DSL (Canada),

ENCS (Japan),

IECSC (China),

KECI (Korea),

PICCS (Phillipines),

TCSI (Taiwan),

TSCA (USA)

Storage & Handling

Shelf Life
6 months
Storage Condition

Store between 40°F and 100°F, protect from freezing until dry.