Best Fire Barrier Caulk in 2026

BUILDING CODE COMPLIANCE – seals openings through fire barriers where mechanical services pass through

HELPS PREVENT FIRE SPREAD - capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C)

ONE PRODUCT, MANY USES – listed in hundreds of UL Firestop systems with up to 4-hour ratings

BUILDING CODE COMPLIANCE – seals openings through fire barriers where mechanical services pass through

HELPS PREVENT FIRE SPREAD - capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C)

ONE PRODUCT, MANY USES – listed in hundreds of UL Firestop systems with up to 4-hour ratings

𝗔𝗰𝗿𝘆𝗹𝗶𝗰 𝗦𝗲𝗮𝗹𝗮𝗻𝘁 Kraken Bond Fire Block Caulk is a single-component, water-based, fire rated acrylic sealant that can be used to seal seams and joints in materials like concrete, stone, and cement.

𝗘𝗮𝘀𝘆 𝘁𝗼 𝗔𝗽𝗽𝗹𝘆 Our high temperature sealer can be applied with a STANDARD CAULKING GUN, a Putty Knife, or a Trowel.

𝗦𝗺𝗼𝗸𝗲 𝗮𝗻𝗱 𝗙𝗶𝗿𝗲𝗥𝗲𝘀𝗶𝘀𝘁𝗮𝗻𝘁 Fire resistant for more than 4 hours without the use of any backfilling material.

TESTED AND LISTED: For through-penetrations up to 3-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115. Provides L-Rating (smoke seal)

TESTED AND LISTED: For construction joints up to 4-hours in accordance with ASTM E1966 (UL 2079) and CAN/ULC S115

ACRYLIC LATEX-BASED SEALANT: Offers an economical alternative to firestopping metal pipes or cables through concrete or gypsum, and in dynamic head-of-wall systems

Firestop tested up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115

Fire resistive joint system tested up to 4 hours in accordance with ASTM E 1966 (UL 2079)

Continuous seal remains pliable and allows for typical pipe movement

BUILDING CODE COMPLIANCE – seals openings through fire barriers where mechanical services pass through

HELPS PREVENT FIRE SPREAD - capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C)

ONE PRODUCT, MANY USES – listed in hundreds of UL Firestop systems with up to 4-hour ratings

BUILDING CODE COMPLIANCE – seals openings through fire barriers where mechanical services pass through

HELPS PREVENT FIRE SPREAD - capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C)

ONE PRODUCT, MANY USES – listed in hundreds of UL Firestop systems with up to 4-hour ratings

TESTED FIRESTOP PERFORMANCE: Tested and listed up to 3-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115

SELF-CONTAINED FIRESTOP: Self-contained, graphite free highly-intumescent products designed to firestop a wide variety of through-penetrations including cable trays, conduit and blank openings

ACHIEVABLE SMOKE SEAL: L-Rating (smoke seal) achievable when used in conjunction with 3M Fire Barrier Moldable Putty

BUILDING CODE COMPLIANCE – seals openings through fire barriers where mechanical services pass through

HELPS PREVENT FIRE SPREAD - capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C)

ONE PRODUCT, MANY USES – listed in hundreds of UL Firestop systems with up to 4-hour ratings

Firestop tested up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115

Fire resistive joint system tested up to 4 hours in accordance with ASTM E 1966 (UL 2079)

Continuous seal remains pliable and allows for typical pipe movement

TESTED AND LISTED: For through-penetrations up to 3-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115. Provides L-Rating (smoke seal)

TESTED AND LISTED: For construction joints up to 4-hours in accordance with ASTM E1966 (UL 2079) and CAN/ULC S115

ACRYLIC LATEX-BASED SEALANT: Offers an economical alternative to firestopping metal pipes or cables through concrete or gypsum, and in dynamic head-of-wall systems

FIRESTOP TESTED: Tested and listed up to 2-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115

STC RATED: Has an STC rating of 57 when tested in a STC 57-rated wall assembly

VOLUME EXPANDING PROPERTIES: Two-part urethane, smoke, sound and firestopping foam designed to expand up to 5 times in volume after dispensing

[𝗙𝗶𝗿𝗲 𝗮𝗻𝗱 𝗦𝗺𝗼𝗸𝗲 𝗥𝗲𝘀𝗶𝘀𝘁𝗮𝗻𝘁] More than 4 hours of fire resistance without using any backfilling material.

[𝗘𝗮𝘀𝘆 𝘁𝗼 𝗔𝗽𝗽𝗹𝘆]STANDARD CAULKING GUN, a Putty Knife or Trowel can be used to apply our fire block caulk.

[𝗪𝗮𝘁𝗲𝗿 𝗕𝗮𝘀𝗲𝗱 𝗔𝗰𝗿𝘆𝗹𝗶𝗰]Akfix AC607 is a single component water-based fire-rated acrylic sealant ideal for sealing joints and seams such as concrete, stone, and cement and can be applied.

Adheres to Most Common Construction & Penetrant Materials

Contains No Solvents; Safe For Use With Most Plastics

Expands Up to 10x Original Size. No Shrinkage in Most Applications

TESTED FIRESTOP PERFORMANCE: Tested and listed up to 3-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115

SELF-CONTAINED FIRESTOP: Self-contained, graphite free highly-intumescent products designed to firestop a wide variety of through-penetrations including cable trays, conduit and blank openings

ACHIEVABLE SMOKE SEAL: L-Rating (smoke seal) achievable when used in conjunction with 3M Fire Barrier Moldable Putty