Foster® 95-55 Sealant

1 of 92 products in this brand
Foster® 95-55 Sealant is a one-component, butyl-based sealant primarily employed as a vapor barrier sealant within the joints of cellular glass, polyisocyanurate (PIR), urethane, and phenolic foam board stock insulations. This sealant remains non-skinning and does not dry within the joint, which permits thermal cycling through a broad spectrum of temperatures without issue.

Product Type: 1K (1 component) Sealant

Application Area: Bedding Compound, Insulators, Metal Jacketing

Compatible Substrates & Surfaces: Glass, Phenolic Foam, Polyisocyanurate, Urethanes

Application Method: Putty Knife, Trowel

Features: Non Drying, Thermal Cycle Resistance, Vapor Barrier

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Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
Product Highlights
  • 95-55 Sealant is primarily used with low temperature insulation to prevent the migration of water and water vapor into the insulation system via butt joints.
  • 95-55 Sealant is also recommended as a bedding compound for the installation of cellular glass insulation. In this application, it protects insulation from abrasion as well as water vapor migration at the bore.
  • 95-55 Sealant may also be used to seal overlaps in metal jacketing in conjunction with mechanical fastening. The sealant shall be within, not over, the lap joint.

Applications & Uses

Application Area
Application Method
Compatible Substrates & Surfaces
Preparation and Application Information

Coverage Range

Trowel:

  • 12 to 25 sq. ft./gal. (0.29 to 0.61 m2/l)
  • 1/8 in. to 1/16 in. wet film thickness (3.2 mm to 1.6 mm)

Drying Time

  • Non-Skinning
Limitations
  • Store and apply between 40°F and 100°F.
  • Always test solvent plastic materials for compatibility when using a solvent base product.
  • Not suggested for use under solvent base mastics and coatings, if minor surface discoloration and/or dirt pick-up would be objectionable. Where Foster 60-95 / 60-96 Monolar coating is being used over sealed insulation joints select Foster 95-50, 30-45N or 95-44 sealants for best results.
  • Do not use this product where surface temperature will exceed 200°F.
  • Not suggested for use as an exposed flashing compound. Select Foster 95-44 sealant or 95-88 sealant for this purpose.
Preparation and Application Information

Material Preparation

  • Do not thin. Apply only to clean, dry, oil-free surfaces. Keep container closed when not in use. Ensure insulation is well fit before applying sealant. Joint width less than 1/8” (3 mm) for best results. Do not use sealant to fill large gaps.

Application

  • Apply by trowel, putty knife or power extrusion. When sealing insulation joints, apply sealant to the edges of abutting sections at 1/16 in. to 1/8 in. (1.6 to 3.2 mm) wet film thickness and press mating surfaces together firmly to squeeze out air bubbles and to obtain complete contact. Strike off excess sealant on surface with trowel.
  • Note: Pressurized piping made from copper and aluminum alloys may be susceptible to under insulation corrosion when in direct contact with many materials. When used as a joint sealant direct contact between pressurized pipes made from these metals and the sealant should be prevented.

Clean Up

  • Use solvent such as chlorinated solvent (non-flammable) or mineral spirits (flammable) for cleaning tools and equipment.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Average Weight / U.S. Gallon11.7lbs.ASTM D1475
Average Non-Volatile (by Volume)93.0% ASTM D2369
Average Non-Volatile (by Weight)94.5% ASTM D2369
Permeability0.0Perm-inASTM E 96, Procedure A
VOC Content (Less Water)80.0g/l-
Application Properties
ValueUnitsTest Method / Conditions
Service Temperature Range (PIR / Urethane Foam)-163 to 93°CFSTM 202
Service Temperature Range (Cellular Glass)-105 to 93°CFSTM 202

Regulatory & Compliance