Name: Metacaulk 835+ Caulk Grade Silicone Firestop Sealant, 5 Gallon Pail – UL Listed Elastomeric Fire Caulk for Penetrations, Expansion Joints, Smoke & Sound Sealing
Brand: Metacaulk
SKU: MET 66019
Price: 620.79 USD
Availability: InStock

Description

Metacaulk 835+ Elastomeric Silicone Firestop Sealant is a professional-grade, one-component fire-rated sealant designed to help prevent the spread of flames, smoke, hot gases, and water through penetrations and construction joints in fire-rated assemblies. Its silicone-based elastomeric formulation remains flexible after curing, making it ideal for areas where vibration, expansion, contraction, or dynamic movement may occur.

This neutral cure, moisture-curing firestop sealant offers excellent weather, moisture, and chemical resistance for both interior and exterior applications. The non-slump formula is suitable for vertical and horizontal installations and can be applied using standard caulking equipment or troweled directly from the pail for larger commercial jobs. Metacaulk 835+ is commonly used in wall and floor penetrations involving electrical, plumbing, telecom, and mechanical systems in gypsum, concrete, and masonry assemblies.

Features & Benefits

Fire-Rated Protection: Designed to help stop the spread of flames, smoke, gases, and water through fire-rated penetrations and joint systems.
Flexible Elastomeric Silicone Formula: Cures to a durable, flexible seal capable of handling dynamic movement, vibration, expansion, and contraction.
Interior & Exterior Use: Weather- and chemical-resistant formulation suitable for both indoor and outdoor applications.
Non-Slump Application: Caulk-grade formula stays in place during vertical and overhead applications for cleaner installation.
Excellent Moisture Resistance: Silicone-based chemistry provides strong resistance to moisture exposure and wet conditions.
One-Component System: Ready-to-use formulation requires no mixing or additives, helping reduce installation time on the jobsite.
Mold Resistant Protection: Protected against mold growth in both wet and cured stages with incorporated biocides.
Compatible with Multiple Penetration Types: Ideal for electrical, plumbing, communication, and mechanical penetrations in gypsum, concrete, and masonry assemblies.
Sound Reduction Performance: Tested to STC 55 for acoustical smoke and sound sealing applications.
UL & ASTM Tested: Tested to ASTM E814 (UL 1479), ASTM E1966 (UL 2079), ASTM E84, ASTM E1399, and ASTM C920 standards.

Technical Data

Product Type	Elastomeric Silicone Firestop Sealant
Container Size	5 Gallon Pail
Color	Gray
Formula Type	One-Component, Neutral Cure Silicone
Cure Type	Moisture Cure
Application Method	Caulking Gun, Bulk Pump, or Trowel
Application Temperature	-20°F to 120°F
Cure Time	Approximately 21 Days
Working Time	10–40 Minutes
VOC Content	~25 g/L
Specific Gravity	1.33
Elongation at Break	600%
Dielectric Strength	479 V/mil
Volume Coverage	Approx. 1155 cu. in. per 5 Gallon Pail
Shelf Life	2 Years
STC Rating	55
ASTM Compliance	ASTM C920 Type S Grade NS Class 25
UL Standards	UL 1479, UL 2079
Flame Spread	3
Smoke Developed Index	22

Recommended Applications

Through-penetration firestop systems
Fire-rated wall and floor assemblies
Electrical conduit penetrations
Plumbing penetrations
Telecom and data cable penetrations
Expansion and control joints
Curtain wall joints
Gypsum wallboard partitions
Concrete and masonry penetrations
Commercial, industrial, institutional, and multifamily construction projects

Application Details

Cut or prepare the penetration or joint opening according to the tested firestop system requirements.

Ensure surfaces are clean and free from loose debris, dust, oil, wax, and contaminants.

Install backing material or wire mesh if required by the UL system design.

Apply Metacaulk® 835+ using a standard caulking gun, pumping equipment, or trowel.

Fill the joint or penetration opening to the required depth and tool flush for a professional finish.

Allow sealant to cure fully before exposure to service conditions.

Always follow the applicable UL system design and manufacturer installation instructions for proper firestop performance.

Metacaulk

Metacaulk 835+ Caulk Grade Silicone Firestop Sealant, 5 Gallon Pail – UL Listed Elastomeric Fire Caulk for Penetrations, Expansion Joints, Smoke & Sound Sealing

Metacaulk 835+ Caulk Grade Silicone Firestop Sealant, 5 Gallon Pail – UL Listed Elastomeric Fire Caulk for Penetrations, Expansion Joints, Smoke & Sound Sealing

FREE SHIPPING ON ALL ORDERS

Metacaulk 1200 Firestop Sealant Metacaulk 1200 Firestop Sealant, 5 Gallon Pail – Elastomeric Fire Rated Construction Joint & Gap Sealant for Expansion Joints, Curtain Walls, Smoke Sealing & Acoustical Applications

Metacaulk 835+ Spray Firestop Sealant, 5 Gallon Pail – Elastomeric Silicone Spray Applied Joint Sealant for Wall & Floor Control Joints, Flexible Fire Rated Smoke & Water Resistant Firestopping

Metacaulk 150+ Firestop Sealant – Red 5 Gallon Pail, Water-Based Elastomeric Fire-Rated Sealant for Joints & Penetrations

Metacaulk 350i Highly Intumescent Firestop Sealant, 5 Gallon Pail – Flexible Fire Rated Smoke & Acoustical Sealant for Construction Joints, Through Penetrations, Gypsum, Concrete & Cable Openings

Metacaulk 150+ Firestop Sealant – Red 10.3 oz Cartridge, Full Case of 12, Water-Based Elastomeric Fire-Rated Caulk for Construction Joints & Penetrations

Recently Viewed

Metacaulk 835+ Caulk Grade Silicone Firestop Sealant, 5 Gallon Pail – UL Listed Elastomeric Fire Caulk for Penetrations, Expansion Joints, Smoke & Sound Sealing

Metacaulk 835+ Caulk Grade Silicone Firestop Sealant, 5 Gallon Pail – UL Listed Elastomeric Fire Caulk for Penetrations, Expansion Joints, Smoke & Sound Sealing

FREE SHIPPING ON ALL ORDERS

Related Products

Recently Viewed