BOSS® 822 Expansion Joint Sealant is a self-leveling, one-component sealant designed for smooth, durable joint filling.

BOSS® 822 is a free-flowing, self-leveling sealant that easily fills joints and cracks to create a smooth, long-lasting seal. Supplied ready-to-use, it cures at room temperature into a tough, rubbery solid. This high-performance sealant adheres well to a wide range of construction materials including concrete, wood, vinyl, glass, and most plastics.

It is engineered to resist weathering, moisture, vibration, ozone, thermal expansion, and extreme temperatures while maintaining flexibility.

• One-component, ready-to-use formula
• Free-flowing and self-leveling for easy application
• Accommodates ±50% joint movement
• Strong adhesion to a wide variety of substrates
• VOC compliant
• Suitable for use on concrete, brick, masonry, wood, glass, vinyl, and most plastics
• Remains flexible from -85°F to 400°F (-65°C to 204°C)

Colors

Cartridge:

• 142931 – White
• 142930 – Tan
• 142929 – Grey

Custom colors available upon request.

Specifications

Uncured Properties
Chemistry	Oxime
Viscosity	110,000 cps
Specific Gravity	1.17
Tack-Free Time	30 minutes
Application Temperature	-35°F to 140°F
Cured Properties
Hardness (Shore A)	23
Tensile Strength	150 psi
Elongation	300%
Service Temperature	-40°F to 325°F

Adhesion-in-Peel

• Poplar: 20
• Oak: 20
• Pine: 20
• Concrete: 15

*Values may vary depending on environmental conditions such as temperature, humidity, and substrate type.