Everkem Firestop 814+ vs. 3M Fire Barrier CP 25WB+
An honest, spec-by-spec comparison of two red intumescent firestop sealants — so you can pick the right one for your penetration and your budget.
Side-by-Side Comparison
| Specification | Everkem Firestop 814+ | 3M™ Fire Barrier CP 25WB+ |
|---|---|---|
| Sealant type | Intumescent, elastomeric, water-based | Intumescent, latex-based, water-based |
| Color | Red | Red |
| Through-penetration standard | ASTM E814 (UL 1479) | ASTM E814 (UL 1479) |
| Joint-system standard | ASTM E1966 (UL 2079) | ASTM E1966 (UL 2079) |
| Max fire rating | Up to 4 hours | Up to 4 hours |
| Application | Standard caulking gun | Standard caulking gun |
| Paintable | Yes | Yes |
| CPVC compatibility | Yes — BlazeMaster®, Corzan®, FlowGuard Gold® named compatible | Verify per listed system |
| LEED v4 / low-VOC (CDPH 01350) | Yes — under 10 g/L VOC | Refer to 3M documentation |
| Freeze/thaw stable | Yes | Refer to 3M documentation |
| Sound (STC) rating | Refer to product data | STC 54 (in tested assembly) |
| Sizes | 10.1 oz, 20 oz, 28 oz, 5 gal | 10.1 oz, 20 oz, 5 gal |
| Price (10.1 oz) | $11.95 | Typically higher |
Where Each One Wins
Choose the Everkem 814+ when…
- Cost per tube matters — same test standard, lower price
- You're firestopping CPVC (BlazeMaster, Corzan, FlowGuard Gold) and want named compatibility
- You need low-VOC / LEED v4 documentation (CDPH 01350)
- Material may see cold storage or transport — it's freeze/thaw stable
- You want larger 28 oz tubes as an option
Choose the 3M CP 25WB+ when…
- Your spec or submittal names 3M specifically
- The assembly needs a documented STC-54 sound rating
- The required UL system lists CP 25WB+ as the tested product
What They Have in Common
Both are red so inspectors can identify them on sight, both go down with a standard caulking gun, both are water-based and paintable after cure, and both expand under heat to reseal pipe, conduit, and cable penetrations. Critically, both are tested to ASTM E814 (UL 1479) for through-penetrations and ASTM E1966 (UL 2079) for joints, with fire ratings up to 4 hours. For the large majority of common commercial penetrations, they are functionally interchangeable product classes — with the caveat below.
Firestop sealants are only code-compliant within their specific tested UL system, and different manufacturers' products are not interchangeable within the same listed system. Before swapping one product for another, confirm there is a UL system (F-A, C-AJ, W-L, or HW-D series) that lists the product you intend to use for your exact penetration, and install per that listing. When in doubt, check with the manufacturer or your AHJ.
Frequently Asked Questions
Is the Everkem 814+ a direct replacement for 3M CP 25WB+?
They are the same product class with matching test standards, but firestop products are only valid within their specific tested UL system. Use the 814+ where there is a UL system that lists it for your penetration — don't drop it into a system that names a different product.
Is the 814+ UL classified?
Yes. It is tested to ASTM E814 (UL 1479) for through-penetrations and ASTM E1966 (UL 2079) for joint systems, for assemblies rated up to 4 hours.
Is it compatible with CPVC fire-sprinkler pipe?
Yes — it is named compatible with BlazeMaster®, Corzan®, and FlowGuard Gold®, as well as PVC, ABS, and PEX. This matters because incompatible sealants can cause environmental stress cracking in CPVC.
Why is it cheaper than 3M?
It's a commercial-grade product from a smaller manufacturer without the brand premium. The performance standards it's tested to are the same.
What sizes does it come in?
10.1 oz cartridge, 20 oz sausage, 28 oz cartridge, and 5-gallon pail — with case and bulk pricing for larger jobs.
3M™, Fire Barrier™, and CP 25WB+ are trademarks of 3M Company. BlazeMaster®, Corzan®, and FlowGuard Gold® are trademarks of The Lubrizol Corporation. This comparison is provided for product identification and evaluation purposes only; PVF Pro and Everkem are not affiliated with, authorized by, or endorsed by 3M. Specifications and pricing are subject to change — always refer to the current manufacturer technical data sheet and UL listings before specifying or installing.