Everkem Rubber Guard NS Butyl Rubber Sealant - Image 1

Everkem Rubber Guard NS Butyl Rubber Sealant

Everkem

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$92.00

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The Rubber Guard NS Non-Skinning Butyl Rubber Sealant from Everkem Diversified Products comes in a 10.1 oz cartridge and delivers a durable, waterproof bond that stays permanently flexible. This grey butyl sealant meets ASTM-C919 standards and maintains low VOC content at 100 g/L, making it suitable for interior and exterior sealing applications.

The non-skinning formula adheres to most building materials without forming a surface skin, which makes it ideal for applications where you need ongoing flexibility. You can use this sealant in STC-rated assemblies as an acoustical sealant, helping with sound dampening in wall and ceiling systems. The EcoSeal formulation keeps environmental impact low while delivering the performance you need on the jobsite.

This butyl sealant works well for sealing gaps in concrete, masonry, metal, and wood surfaces where movement is expected. The permanently flexible nature means it won't crack or lose adhesion when building materials expand and contract with temperature changes. Made in the USA, it's ready to use straight from the cartridge with standard caulk guns.

Technical Details

Key Specs

Chemistry	Synthetic butyl rubber
Cure	Non-skinning, non-curing, permanently flexible
Service temperature	-40°F to 250°F (-40°C to 121°C)
ASTM standards	Meets ASTM-C919, ASTM-C1311
VOC content	100 g/L
Color	Gray

Full Specifications

Typical Physical Properties

Chemistry	Synthetic rubber (butyl)
Application temperature	40°F to 95°F (4.4°C to 35°C)
Tooling time	Non-skinning, permanently tacky
Cure time	Non-curing
Shelf life	2 years
Service temperature	-40°F to 250°F (-40°C to 121°C)
ASTM-C919	Meets ASTM-C919 — Standard Practice for Use of Sealants in Acoustical Applications
ASTM-C1311	Meets ASTM-C1311 — Solvent Release Sealants in Building Construction; max joint movement ±7.5%
Shrinkage	20% maximum
Weathering	No adhesion loss; no cracking; slight color change
Water resistance	No adhesion loss; no shrinkage; no chalking
VOC content	100 g/L

Available colors: Gray

Applications

Under roof drains
Roof panel rib sealant
Behind termination bars
Vapor barrier sealant
Waterproofing sealant in unexposed applications
Acoustical sealant to reduce sound transmission in STC-rated assemblies

Advantages

Non-skinning, non-curing, permanently flexible
Adheres to most common building substrates
Durable, long-lasting bond across a wide service-temperature range
Meets ASTM-C919 (acoustical sealant practice) and ASTM-C1311 (solvent-release sealants)

Limitations

Not recommended for contact with insulated glass sealants or glazing applications
Not intended for use in applications exposed to direct UV light
Not for use in exposed applications where the product may pick up dirt or dust

Compliance & Standards

CSI specified divisions

07 92 00 — Joint Sealants
07 92 19 — Acoustical Joint Sealants
22 00 00 — Plumbing
23 00 00 — Heating, Ventilating, and Air Conditioning (HVAC)

Applicable standards

ASTM-C919 — Standard Practice for Use of Sealants in Acoustical Applications
ASTM-C1311 — Solvent Release Sealants in Building Construction (max joint movement ±7.5%)

EcoSeal (low-VOC) compliance

V.O.C. Content: 100 g/L

Sizes & Part Numbers

Part #	Description	Packaging	Color
RGNS-10G	Rubber Guard-NS — 10.1 fl. oz. (298.7 mL) cartridge	Each	Gray

Equivalent Products from Other Brands

Switching brands? This Everkem product is a functional equivalent to the competitor SKUs listed below per Everkem’s published Product Cross Reference. Formulations, cure times, and exact specs vary by manufacturer — confirm your project’s spec requirements before substituting.

Brand	Part Number	Product Name
DAP	18185	Dap Butyl-Flex Sealant
Red Devil	0697GI	Red Devil Pro Butyl Rubber Sealant