Foster® Flextra® Sealant 95-50

• 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.

• 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.

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.

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

Combustible. Flame spread and fuel contribution negligible when used as sealant in 1/8 in. wide joints of incombustible insulation.

Store and apply between 40°F and 100°F