Foster® Flextra® Sealant 95-50
1 of 34 products in this brandFoster® Flextra® Sealant 95-50 is a single-component sealant primarily composed of butyl rubber. It serves as a vapor barrier sealant, typically applied in the joints of various insulation materials, including cellular glass, polyisocyanurate (PIR), urethane, and phenolic foam board stock insulations. This sealant maintains its soft and flexible properties, safeguarding insulation from damage caused by thermal cycling across a wide temperature range.
RTU Product Type: 1K (1 component) Sealant
Compatible Substrates & Surfaces: Glass, Phenolics, Polyisocyanurate
Application Method: Trowel
Features: Flexible, Vapor Barrier
Enhanced TDS
Identification
- GBU
- RTU Product Type
- Categories
Applications
- Application Method
- Compatible Substrates & Surfaces
Applications & Uses
- Limitations
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- 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.
- Discoloration can be minimized by allowing 24 to 48 hours cure time before top coating.
- Do not use this product where surface temperature will exceed 200°F (93°C).
- Not suggested for use as a flashing compound.
- Preparation and Application Information
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Material Preparation
- Do Not Thin.
- Apply only to clean, dry, oil-free surfaces.
- Keep container closed when not in use.
Application
- Apply by trowel, putty knife or power extrusion.
- When sealing insulation joints, apply FLEXTRA® 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.
Power Extrusion
- Flextra® Sealant may be applied using a wide variety of power (pressure) extrusion equipment suitable for use with solvent base sealants.
- It has a soft and buttery consistency with a typical viscosity range of 225,000-325,000 cps (HBT, 5 rpm).
- 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.
Features
- Ready-to-Use Product Features
Features & Benefits
- Product Highlights
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- Flextra® Sealant is primarily used with low temperature insulation to prevent the migration of water and water vapor into the insulation system via butt joints.
- Flextra® Sealant is also recommended as a bedding compound for the installation of cellular glass insulation. In this application, it protects both the insulation from abrasion and metal surfaces from corrosion.
- Flextra® Sealant is supplied in a special “buttery” consistency, which facilitates application to insulation surfaces without stringing or excessive drag.
- It may be applied at temperatures as low as 50°F (10°C) without difficulty.
- Flextra® Sealant meets requirements for LEED IEQ 4.1 Low-Emitting Materials, Adhesives and Sealants.
- VOC: <420 g/l, less water and exempt solvents.
- Flextra® Sealant contains no asbestos, lead, mercury, or mercury compounds.
Packaging & Availability
- Regional Availability
Physical Properties
- Physical Form
Properties
- Shelf Life:
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6 months
- Combustibility
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Combustible. Flame spread and fuel contribution negligible when used as sealant in 1/8 in. wide joints of incombustible insulation.
- Water Vapor Transmission Rate
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The water vapor transmission through 1 in. of impermeable insulation in 12 x 18 in. blocks with 1/8 in. joints of 95-50 is too small to measure. Test method : ASTM E 96
- Application Properties
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Value Units Test Method / Conditions Service Temperature Range (PIR / urethane foam, at coated surface) -100 to 93 °C - Service Temperature Range (cellular glass, at coated surface) -163 to 93 °C - Viscosity (at 5 rpm) 225,000 - 325,000 cPs HBT - Typical Properties
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Value Units Test Method / Conditions Average Non-Volatile Content 73 Wt(%) ASTM D2369 Average Non-Volatile Content 82 Vol(%) - Average Non-Volatile Content 89 Wt(%) - Coverage (1/8 in. to 1/16 in. wet film thickness, trowel) 12 - 25 ft²/gal FSTM 71 Density 11.6 lbs/gal ASTM D1475 Drying Time (skins over, essentially non-drying) 2 - 3 hours - Flash Point (wet flammability) 63 °C ASTM D93 Storage Temperature 4 - 38 °C - Volatile Organic Compound Content max. 420 g/L -
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
Storage & Handling
- Storage Condition
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Store and apply between 40°F and 100°F
- Shelf Life
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6 months