A. Inhibition of Cure
Certain materials, chemicals, curing agents and plasticizers can inhibit the cure of 3M Fire Barrier Silicone RTV Foam, including:
- Organotin and other organometallic compounds
- Silicone rubber containing organotin catalyst
- Sulfur, polysulfides, polysulfones and other sulfur-containing materials
- Amines, urethanes and amine-containing materials
- Unsaturated hydrocarbon plasticizers
B. Preparatory Work
The penetration opening and all related surfaces must be clean of dirt, dust and loose impediments. Surfaces must also be free of water, oil or other free liquids.
C. Painting or Coating
Most coatings/paints do not adhere to this product.
D. Damming the Penetration
Damming is required to prevent the liquid foam mixture from running out before it foams. Damming materials may also contribute to the fire resistant properties of particular system configurations. Check system design to make sure that proper damming materials and technique are used.
E. Mixing the Components
Prior to use, Part A and Part B components must be thoroughly stirred in their original containers to uniformly redisperse any fillers or pigments that may have settled. When mixing Part A and Part B, use clean containers and mixing equipment. If stirred containers stand for more than four hours, re-stir.
At time of installation, material temperature should be between 65°F (18°C) and 80°F (27°C). This can be done by bringing the containers into a room between 65°F (18°C) and 80°F (27°C) and allowing them to sit for 12 hours. Please check material temperature prior to use if there is a possibility it is outside this range.
To properly catalyze 3M Fire Barrier 2001 Silicone RTV Foam, an equal quantity of Part A is added to an equal quantity of Part B by either weight or volume. For batch mixing by hand or power mix, vigorous and thorough mixing should be maintained for 30 to 60 seconds. The mixed product begins to foam shortly after mixing; therefore, it should be dispensed in the penetration as soon as
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mixing is completed. For large-volume applications, the use of suitable automatic mixing, metering and dispensing equipment is recommended. A list of equipment manufacturers is available from 3M upon request.
The type and degree of mixing can significantly affect the cell structure and density of the final foam product. Hand mixing will typically result in higher densities than power mixing by automatic mixing, metering and dispensing equipment. Typical expansion is 2:1 to 4:1 depending on the type and degree of mixing.
F. Working Time
When properly mixed, 3M Fire Barrier 2001 Silicone RTV Foam has a snap time (or working time) of one to two minutes at 77°F (25°C). Snap time is dependent upon the temperature of the A and B components just before and after they are mixed.
G. Installation
CAUTION: When using 3M Fire Barrier 2001 Silicone RTV Foam to seal large penetration openings, care should be exercised to avoid gas entrapment. Adequate ventilation should be provided to prevent build-up of hydrogen gas. Forced air ventilation is necessary if the work area has less than two cubic feet of free air space for each pound of liquid mixing being foamed. Adequate ventilation must be provided to prevent build-up of hydrogen gas at explosive levels.
Waste materials must be considered with regard to these precautionary measures during disposal and storage. Waste materials should not be sealed in such things as plastic bags and similar containers that could trap hydrogen gas.
3M Fire Barrier 2001 Silicone RTV Foam should not be dispensed in liquid layers thicker than 1 inch (2.54 cm) at any given spot. Allow at least 15 minutes between application of each foam layer. If the opening is not filled to the desirable level when the cured foam has completed its expansion, repeat the injection and cure procedure until the desired fill rate is attained.
To permit a clear view when filling a wall cavity, damming materials are built up gradually. The top of the opening is dammed for the final shot of foam. After the foam is installed, damming materials are left in place for 24 hours to allow the penetration seal to cure fully.
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After 24 hours, the penetration seal must be completely inspected by removing the damming materials. Curing foam should completely fill the penetration, providing a tight, compressive fit. Any remaining gaps are filled with freshly mixed foam or 3M Fire Barrier 2000 Silicone Sealant. The seal should then be reinspected after an additional 24 hours. Damming materials that are part of a specific system design must be replaced to their proper positions.
H. Quality Control
| Snap Time, minutes1
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1-2
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| Free Foam Density1,
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14-10
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| lb/ft (gm/cm)
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(0.22-0.32)
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| Color Chart Comparision
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| (3M Form #98-0400-2359-4)
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Pass
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| Cell structure Chart Comparison
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| (3M Form #98-0400-2359-4)
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Pass
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1Standard procedures for measuring snap time and free foam density are available from 3M upon request. Totally unconfined, density values as low as 14 lb/ft3 (.22 gm/cm) may be obtained.
I. Clean Up
Excess foam around the penetration seal can be removed with a sharp knife or blade. Spills of Part A and Part B liquid components can be removed with high flash-point mineral spirit solvent. Follow manufacturers precautions when handling solvents.
Installation Notes:
Shown are examples of UL classified applications of 2001 Silicone RTV Foam. Additional drawings and details are available through your Authorized 3M Fire Protection Products Distributors.
1. Metal pipe/conduit/insulated cables (See Figure 1)
- All cases require a minimum 7-inch depth of 2001 Silicone RTV Foam.
- All cases 1 inch thick Fiberfrax® Duraboard™ LD at the bottom surface of floor openings.
- Maximum 2.7 percent cable fill allowed based on cross-sectional area.
2. Cable tray through concrete wall (See Figure 2)
- All cases require a minimum 7-inch depth of 2001 Silicone RTV Foam.
- All cases 1 inch thick Fiberfrax® Duraboard™ LD required at both wall surfaces.
- Maximum two steel open ladder-back cable trays 18" wide x 3" deep.
- Maximum cable fill in trays is 39 percent based on cross-sectional area.
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