Foster® 81-84NH Non-Halogenated Adhesive/Sealant

• 81-84NH Adhesive/Sealant can be used as both an attachment adhesive and joint sealant in low temperature installations using cellular glass, polystyrene, phenolic or PUR and PIR foam insulations.
• It contains no asphalt and can be top-coated with solvent based products without bleed-through.
• 81-84NH Adhesive/Sealant meets requirements for LEED 2009 IEQ 4.1 Low-Emitting Materials, Adhesives and Sealants.
• VOC 81-84NH Part A: 20 g/l, less water and exempt solvent.
• VOC 81-84 Part B: 0 g/l, less water and exempt solvents.
• 81-84NH Adhesive/Sealant contains no asbestos, lead, mercury, or mercury compounds.

Material Preparation

• Do Not Thin.
• Stirring should not be necessary, but if Part A has remained undisturbed for any extended period, stir well.
• Do not use sticks or paddles, which could splinter or otherwise contaminate the product.
• Containers must be kept closed and in dry storage when not in use.
• Blend only the amount of material, which can be applied in one hour.
• Mixing should be continued for three minutes maximum with a suitable air or electric mixer operating at low speed, until the 81- 84NH is smooth and completely homogeneous.
• Do not over mix. Do not heat Part A, Part B, or the mixed material.
• Exposure to vapors of heated product may be harmful.
• Heated vapors are potential respiratory and skin sensitizers, and possible eye irritants.
• Provide adequate ventilation in enclosed areas.
• The 3.4 gallon (12.8 liter) kit is packaged to allow for the full 48 oz (1.4 liter) jug of Part B to be mixed directly in the pail with 3 gallons (11.4 liters) of Part A.
• If Part A and Part B are ordered in separate packaging one 0.5 gallon (1.9 liter) jug of Part B is to be mixed with one 4 gallon (15.1 liter) pail of Part A.
• Alternately Part A and Part B may be portioned off and mixed in a separate container in quantities as needed for a one hour working period.
• When portioning off maintain the proper mix ratio:
• 8 Parts A: 1 Part B (By Volume)
• 9 Parts A: 1 Part B (By Weight)
• Replace the cap on unused Part B immediately after use to prevent moisture contamination.

Application 

• Apply only to clean dry surfaces.
• Adhesive/Sealant 81-84NH may be applied to either or both surfaces at the recommended coverage rate.
• Surfaces must be bonded within one hour after application of the adhesive.
• On rough surfaces, a thicker application of 81-84NH is required as necessary to assure complete contact between the insulation and the substrate.
• A notched trowel is suggested.

Suggested coverages:

• Cellular glass block - 20 to 30 sq. ft./gallon (0.49 to 0.74 m2/l).
• Polyurethane, polystyrene, and polyisocyanurate rigid board stock – 50-100 sq. ft/gallon (1.22 to 2.45 m2/liter).

Clean-up

• Before adhesive cures, clean tools and equipment with chlorinated solvent (non-flammable) or mineral spirits (flammable). Dried 81- 84NH Adhesive/Sealant is extremely difficult to remove.

• Store and apply between 40°F (4°C) and 100°F (38°C).
• Allow 48 hours curing time at 73° F (23° C) minimum before placing in service.
• Pot life will be longer at lower temperatures, shorter at higher temperatures.
• Part B is sensitive to moisture and humidity.
• Keep container tightly sealed when not in use.
• Do not heat Part A, Part B, or the mixed material.