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 |