The 995 is a structural sealant designed for structural glazing and high impact installations bonding glass to metal frames. The 999A is not suitable for structural glazing. This is designed for conventional weather sealing, shear joints and non structural glass/metal and plastic assembly sealing.
Dow Corning 999A Silicone Glazing Sealant — Clear, 10.3 Oz., Model# DCS-999A-1

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- Resistant to sunlight, rain, sleet, snow, ultraviolet radiation, ozone, and temperature extremes
- Retains design properties even after years of exposure – seals remain watertight and weatherproof
- Wide service temperature range from -60 to 177°C (-76 to 350°F) with intermittent temperatures up to 200°C (392°F)
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