Cut Sheet

SERIES SIL SILICONE FIRESTOP SEALANT
SpecSeal® Series SIL Silicone Firestop Sealant is used to seal
both through-penetration firestop systems and joint systems.
Representative systems have been tested involving primarily
non-combustible penetrants, electrical, data, or telephone
cables, construction gaps, expansion joints, curtain wall safing
applications, and top-of-wall joints.
SpecSeal® Series SIL Silicone Firestop Sealant is a one-part,neutral-curing silicone sealant exhibiting superior
performance in applications where sealing openings in walls and floors are needed to control the spread of fire, smoke,
toxic gasses, and water during fire conditions.
SpecSeal® Series SIL Silicone Firestop Sealant reacts with atmospheric moisture to form a high-strength, durable
seal that will adhere to most building substrates without the use of primers. SpecSeal® products do not contain
asbestos or PCBs.
BASIC USES:
SpecSeal® Series SIL Silicone Firestop Sealant is designed for use in firestop systems for through penetrations and
joints. This product excels in applications where greater water resistance is required. Systems have been tested for
Class 1 W Ratings per UL1479.
SpecSeal® Series SIL Silicone Firestop Sealant is available in non-sag (SIL300) and self-leveling (SIL300SL) grades
and may also be used to seal vertical and horizontal joints between metals, masonry, concrete and other common
construction materials. SpecSeal® Series SIL Silicone Firestop Sealant is specially designed for use in static or
dynamic joints. The low modulus characteristic minimizes strain on the substrate surface and the elastomeric quality
allows excellent recovery from extension and compression cycling.
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SpecSeal® Series SIL Silicone Firestop Sealants are the basis for systems that meet the exacting criteria of ASTM
E814, (UL 1479), ASTM E1966 (UL 2079), ASTM E1399, as well as the time-temperature requirements of ASTM E119
(UL 263). Firestop systems for both joint systems and through penetration firestops have been tested with ratings up
to 4 hours. See UL Systems for more specific information.
Additionally, SpecSeal® Series SIL Silicone Firestop Sealant meets ASTM C920, “Standard Specification for
Elastomeric Joint Sealants”. For SIL300, the product is listed as Type S, Grade NS, Class 50, Use A, G, M, O. For
SIL300SL, the product is listed as Type S, Grade P, Class 25, Use A, G, M, O.
Finally, SIL300 (non-sag) has been evaluated by NSF Laboratories for inclusion in Lubrizol's FGG/BM/CZ CPVC
System Compatible program.
PRODUCT DESCRIPTION
PERFORMANCE
PHYSICAL PROPERTIES
APPLICATIONS
SPECIFICATIONS
• Low Modulus allows dynamic movement in
joints.
• Auto Bonding allows fresh sealant to
adhere to cured sealant.
• Excellent Water Resistance for water-tight
sealing; including Class 1 W Ratings (UL1479).
• Ozone and UV Resistant for excellent
weathering ability and long service life.
• Excellent Chemical Resistance protects in
polluted or corrosive atmospheres.
• Excellent Adhesion to most building
substrates.
• Excellent Smoke Seal
• Neutral Cure
FEATURES
PRODUCT DATA SHEET
The silicone firestop sealant shall be a one-part, neutral-
cure meeting the requirements of ASTM C920. The
firestop sealant shall be UL Classified and tested to ASTM
E814 (UL1479), ASTM E1966 (UL2079), and CAN/ULC-
S115. Class 1 W Ratings per UL1479 shall be available
for a variety of different firestop systems.
SPECIFIED DIVISIONS
STI Product Data Sheet •SpecSeal® Series SIL Silicone Firestop Sealant • FOD-5112 1586
Typical Properties – As Supplied
Property SIL300 (Non-Sag) SIL300SL (Self-Leveling)
Consistency Trowelable Pourable
Percent Solids 100% 85%
VOC, ASTM D2369 27 g/L < 47 g/L
Tooling Time 25-30 minutes 25-30 minutes
Tack Free, ASTM C679 (77ºF, 50%RH) 3-4 hours 50-60 minutes
Sag/Slump, ASTM D2202 0.1” max N.A.
Storage Temperature <80F (27C) <80F (27C)
Installation Temperature -35ºF to 140ºF (-37ºC to 60ºC) -35ºF to 140ºF (-37ºC to 60ºC)
Shelf Life 18 mos 18 mos
Storage Warranty Period* 12 mos 12 mos
Weight Per Gallon 11.6 lbs/gal 11.5 lbs/gal
Viscosity 1,200,000 cps 25,000 cps
Table A: Typical Properties – Cured
Property SIL300 (Non-Sag) SIL300SL (Self-Leveling)
Color Concrete (limestone)
Hardness, Durometer (Type A Indentor),
ASTM D2240
24 26
Ultimate Tensile Strength, ASTM D412 341 psi (2.35 MPa) 110 psi (0.76 MPa)
Ultimate Elongation, ASTM D412 715% 600%
Tensile at 100% Elongation, ASTM D412 73.2 psi (0.50 MPa) 60 psi (0.41 MPa)
Peel Strength (21 day cure @ 77ºF/50 RH),
ASTM C794
56.6 pli 12 pli
Movement Capability
ASTM C719 ± 50% ± 50%
ASTM E1399 ± 35% ± 15%
In Service Temperature -35ºF (-37ºC) to 350ºF (177ºC) -35ºF (-37ºC) to 300ºF (149ºC)
Weathering & U.V. Resistance Excellent Excellent
Flame Spread Index, ASTM E84 or UL723 5
Smoke Developed Index, ASTM E84 or UL723 45
STC Rating 61 (Relates to specific construction) (ASTM E 90-04/ASTM C919)
*From date of shipment if stored in original unopened container at 80°F (27°C).
DIV. 7 07 84 00 Firestopping
DIV. 7 07 92 00 Joint Sealants
DIV. 22 22 00 00 Plumbing
DIV. 23 23 00 00 HVAC
DIV. 26 26 00 00 Electrical