STI SpecSeal® SSP Putty STI-SP100

Firestopping That's Easy to Apply & Versatile for Small Cable Penetrations and Electrical Wall Boxes


What's special about this sealant?

  • Convenient fire protection that's designed to close construction gaps, blank openings and pass-throughs in walls and electrical boxes.
  • Thanks to its non-hardening properties, this putty has excellent adhesion and stays put once set.
  • This easiest, versatile sealant has proven itself as a leader in fire protection and sound proofing.
  • Click for More Features
  • UL Classified

An excellent product for retrofit jobs and cabling that call for a firestopping sealant. It is easy to apply and meets the highest quality standards. This 36 cubic inch bar is all you need for metallic conduits, telephone, data or electrical power cable penetrations as well as a variety of sleeved and non-sleeved applications. Often you will have high traffic areas of cabling where people are constantly moving things around; in situations like these, you need the kind of flexibility provided by this putty.

Part # Description Weight Price
STI-SSP100 STI SpecSeal SSP Putty 36 cu in 0.6 lb
Manufacturer Direct

No cure time required. Thanks to its quick dry application, you can just apply and go. To make it even easier, this bar is re-sealable, and no tools are needed for application.

  • Endothermic fillers absorb heat and release water for safety and proper functioning.
  • This sealant is unaffected by humidity, condensation, and water to assure protection when you need it.
  • Superior protection against the spread of fire, smoke and toxic gases thanks to the putty's ability to expand to eight times its original size when exposed to high temperatures or fire.
  • Two stage intumescence gives you an aggressive expansion which fills completely for 100% protection
  • Tool-less installation makes it the smart choice for your tool kit.
  • Aggressive adhesive quality makes it ideal for use with all common construction materials, as well as cable jacketing and pipes.
  • Meets ASTM E814 (UL1479) requirements as well as sound attenuation properties per ASTM C919 and E90 and fully tested to the requirements of the time/temperature requirements of ASTM E119, with ratings up to 3 hours.



A regular maintenance program should be in place to ensure there is no damage to your sealant.

Make sure to remove excess material from all surfaces anyone may come into contact with immediately, and wash your hands or skin after using with a waterless hand cleaner.


Color Red
Density 1.45
Expansion Begins 230° F (110° C)
Odor none
Shelf Life No limit
Ratings UL Listed and classified and FM approved to ASTM E814 (UL1479); UL C-AJ-1090, C-AJ-3154, C-AJ-8055, W-J-3046, W-L-3135, W-L-3024
Division 7 07840 Through-penetration firestopping
Division 13 13900 Special construction fire suppression and supervisory systems
Division 15 15250 Mechanical insulation-fire protection
Division 16 16050 Basic electrical materials and methods
Solids 100%
STC Rating 51
VOC Content 0 lbs/gallon (0.0 g/L)
Temperature In-service: 130° F (54° C)
Volume Expansion  >500% (free expansion)
Size 36 cubic inches
Weight 0.6 lb (0.3 kg)
Warranty 1 year
Material Safety Data Sheet
Hazards Information
Eye Contact May cause irritation and redness
Skin Contact May cause irritation and redness
Ingestion Relatively non-toxic
Inhalation Irritation of the nose, throat, and lungs may result from over-exposure to vapors or mist from heated material
Chronic (Cancer) Information Not classified as carcinogenic
Long Term Toxic Effects Non known
First Aid Measures
Inhalation Remove to fresh air
Skin Contact Wash thoroughly
Eye Contact Irrigate eyes with running water for at least 15 minutes. Get medical attention if irritation develops
Ingestion None applicable
Fire Fighting Measures
Flash Point  >163° C based on most volatile component
Extinguishing Media Dry Chemical; Carbon Dioxide; Foam; Water spray for large fires
Special Fire Fighting Procedures As for surrounding fire
Accidental Release Measures
Safeguards (Personnel)
NOTE: Review FIRE FIGHTING MEASURES and HANDLING (PERSONNEL) sections before proceeding with clean-up. Use appropriate PERSONAL PROTECTIVE EQUIPMENT during clean-up.
Handling and Storage
Store under ambient conditions. No special handling required
Exposure Controls / Personal Protection
Eye Protection Requirements Safety Glasses/Goggles
Skin Protection Requirements Gloves
Respirator Requirements None
Ventilation Requirements Non
Exposure Guidelines None
Physical and Chemical Properties
Physical Form Red solid with minimal odor
Specific Gravity 1.49
Percent Volatiles none
Solubility in Water Very Slight
Stability and Reactivity
Stability This is a stable material
Conditions to Avoid Storage > 55° C
Hazardous Polymerization Will not occur
Incompatibilities None special
Toxicological Information
Mixture not tested but based on components:
May be irritating to skin and eyes and may aggravate existing skin and eye conditions. Irritation to the nose, throat, and lungs may result from over-exposure to vapors or mist from heated material.
None of the components are listed as carcinogens.
Ecological Information
No data. Not anticipated to be environmental hazard.
Disposal Considerations
Waste Disposal:
Treatment, storage, transportation, and disposal must be in accordance with applicable Federal, State/Provincial, and Local regulations.
Transportation Information
DOT - not regulated
Regulatory Information

US Federal Regulation

TSCA Inventory Status: Article

Section 313 Supplier Notifications.
This product contains no toxic chemicals subject to the reporting requirements of Section 313 of the Emergency Planning and Community Right-To-Know Act of 1986 and 40 CFR 372.

Other Information

  Health:            1
  Flammability: 0
  Reactivity:       0
Personal Protection rating to be supplied by user depending on use conditions.


State Right-To-Know Laws

No substances on the state hazardous substances list, for the states indicated below, are used in the manufacture of products on this Material Safety Data Sheet, with the exceptions indicated. While we don not specifically analyze these products, or the raw materials used in their manufacture, for substances on various state hazardous substances lists, to the best of our knowledge the products on this Material Safety Data Sheet contain no such substances except for those specifically listed below:


WARNING: SUBSTANCES KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER: Possible traces or formaldehyde and acrylonitrile.




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