Dow 982 NSG Silicone Insulating Glass Sealant
Application Type Seal, Bond 1 Part or 2 Part 2 Part Material Form Liquid (Curing Agent), Paste (Base) Substrate Glass Manufacturer Dow Chemistry Silicone Cure Method Base/Curing Agent Cure Temperature (°C) 25 Cure Time (min) 10,080 Viscosity (cPs) Non-slump, Pourable
Technical Data for Dow 982 NSG Silicone Insulating Glass Sealant
Cure Temperature (°C) 25 Test Method Cure Time (min) 10,080 Test Method Viscosity (cPs) Non-slump, Pourable Work / Pot Time (min) 20 to 40 Test Method Mix Ratio 9:1 (by volume), 10:1 (by weight)
Tensile Strength (psi) 228 Test Method
Environmental Resistance Environmental resistance
Shore A Hardness 43 Test Method Elongation (%) 2 Test Method Flexibility Flexible Modulus (psi) High
Specific Gravity 1.380, 1.220 Test Method Flash Point (°F) 109.4
Shelf Life Details When stored in cool, dry conditions below 32°C (90°F) in the original unopened containers, Dow Corning 982 Silicone Insulating Glass Sealant – Base and Dow Corning 982 NSG Curing Agent have a usable life of 12 months from date of manufacture. Refer to product packaging for “Use By” date. Shelf Life Type From date of manufacture Shelf Life (mon) 12
Not Good For
Don't Use For green or partially vulcanized rubber gaskets, tapes Don't Use With bleed olils, plasticizers, wood, oil-based caulks
Best Practices for Dow 982 NSG Silicone Insulating Glass Sealant
Before using this product, clean all surfaces, removing all foreign matter and contaminants, such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings. Clean all metal, glass and plastic surfaces by mechanical or solvent procedures. Always wipe solvents on and off with clean, oil- and lint-free cloths.
Follow solvent manufacturer’s recommended safe handling instructions and applicable federal, state and local laws.
To obtain ultimate physical properties, Dow Corning 982 Silicone Insulating Glass Sealant – Base and Dow Corning 982 NSG Curing Agent should be thoroughly mixed using an airless mixing system. As a custom feature for the customer, the cure rate may be adjusted by changing the base-to-curing agent mix ratio from 9:1 to 10.5:1 by volume (10:1 to 12:1 by weight). Sealant physical properties are not significantly changed over this range. Changes in the temperature and humidity of the environment, however, will affect snap time. Dow Corning 982 NSG Silicone Insulating Glass Sealant is compatible with existing commercial two-part silicone dispensing equipment. Neither hand-mixing nor mechanical mixing is satisfactory due to incorporation of air resulting in altered physical properties. Because of its reactivity with atmospheric moisture, Dow Corning 982 NSG Curing Agent should not be exposed to air for prolonged periods. During shutdown of mixing equipment, dispensing and mixing lines should be purged with uncatalyzed base to minimize sealant build-up. Lot matching of Dow Corning 982 Silicone Insulating Glass Sealant – Base and Dow Corning 982 NSG Curing Agent is NOT required.
Dow Corning recommends several in-house quality control tests to ensure optimum sealant performance. These tests include: Butterfly test to ensure proper mix.
Snap time or cure test to ensure expected sealant cure rate at proper mix ratio.
Tab adhesion to ensure proper sealant adhesion to production surfaces These tests should be performed every time lots of base or curing agent are changed, or every time the production line is started. Specific procedures for these recommended tests can be supplied by Dow Corning.
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Cure Temperature Test Methods
|Cure Temperature||Cure Time Test Method|
|25°C||50 percent RH|
Cure Time Test Methods
|Cure Time||Test Method|
|10,080 min||50 percent RH|
Work / Pot Time Test Methods
|Work / Pot Time||Test Method|
|20 to 40 min||CTM 0092|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Cure Temperature||Cure Humidity||Test Method|
|228 psi||10,080 min||25°C||50 (%) RH||ASTM D 412, 7 Days at 50 percent RH and 25°C (77°F)|
Elongation Test Methods
|2 %||ASTM D 412|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method||Hardness Temperature|
|43||ASTM C 66 l, 7 Days at 50 percent RH and 25°C (77°F)||25°C|
Specific Gravity Test Methods
|Specific Gravity||Test Method|