XtraStop550 - Smoke & Draft Sealant

XtraStop 550 is designed for filling areas around wires, vents, pipes, ducts and other wall penetrations & construction voids. It is a commercial quality, intumescent, non combustible fire, smoke and draft stopping sealant. XtraStop™ 550 is a water based sealant and can be used wherever ASTM E-814 Specification is needed. The Fire Stop Caulk can withstand 3000 degrees for up to 8 hours and can be safely removed with soap and water prior to curing.


  • Masonry Applications
  • High Heat Applications
  • HVAC
  • Light Commercial Applications
  • Chimneys
  • Plumbing & Electrical


  • Non Combustible
  • Water Resistant
  • Bonds to most Materials
  • Non-Sag
  • Withstand 3000 Degrees
  • Non Toxic
  • ASTM E-814 - 8 hours


ASTM E-814, ASTM E-119, ASTM-E136, ASTM-E84, ANSI A2.1, AFPA 25.1, UBC43-.1

Technical Specs

Curing Rate 72 Hours @ 77 deg F/ 50% RH
Shrinkage +/- 5%
Application Temp. 40 degrees
Viscosity Spreadable Paste
UV Rating No discoloration or change in appearance



XtraStop™ 550 has been factory tested at 3000° F for 8 hours and has been classified by UL as a non-combustible product in compliance with zero flame and zero smoke.



This product is available in the following colors:

  • Brick Red


The XP550 is available for the following industries


This product is available in the following configurations:

  • 10.1 fl oz plastic fixed nozzle cartridges; 1, 3, 5 & 55 gallon available upon request

Limited Lifetime Warranty

This product is guaranteed to give satisfactory performance if applied in accordance with the label directions. Liability to Premier Industrial Supply, Inc. (Premier) is limited to a full refund of the purchase price or product replacement if product is proven defective. Premier shall not be liable for loss or damage, whether direct, consequential or incidental. There are no other warranties expressed or implied including the implied warranty of merchantability or fitness for a particular purpose.