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Product Information
INTRODUCTION
APPLICATIONS / PRODUCTS
SYSTEM DETAILS
ESTIMATING TABLES  /  TECH DATA
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Product description
•
Fire-resistant mortar suitable
for firestopping large openings
Product features
•
Quick-setting—forms can be removed in as little as 2 hours
•
Superior working properties
•
Can be used in horizontal or vertical applications
Areas of application
•
Sealing medium-sized to large openings with
non-combustible pipes or cable trays
•
Permanent fire seal for cables, cable trays and
non-combustible pipes
For use with
•
Concrete and masonry assemblies
•
Walls and floors rated up to 4-hours
Examples
•
Large openings containing multiple steel,
conduit and EMT pipes
•
Large openings with single or multiple
cable tray applications
CP 637
Technical Data
At 73°F (23°C) and 50% relative humidity
Application temperature (ideal)
40°F to 110°F (5°C  to 43°C)
Color
Light red
Form removal
(depending on consistency)
Approx. 2 hours
Density:
Approx. 40.6 pcf (dry)
Expansion on setting (approx.)
0.08%
Compressive strength
24 hrs.
After
after casting
full cure
• Pourable
360 psi
725 psi
(2.5 N/mm2)
(5.0 N/mm2)
• Plastic
610 psi
1200 psi
(4.2 N/mm2)
(8.3 N/mm2)
• Stiff
870 psi
1784 psi
(6.0 N/mm2)
(12.3 N/mm2)
Surface burning characteristics
(ASTM E84-01)
Flame spread: 5
Smoke development: 0
Yield (30 lb pail)
900–1000 cubic inches depending on mix
ratio
Tested in accordance with
• ASTM E 814
• UL 1479
• ASTM E 84
• CAN4-S115-95M
• ULC-S115-95M
Internationally tested and approved
CP 637
Firestop Mortar
Installation instructions for CP 637
1. Clean penetration.
Pre-moisten sides of
penetration.
2. Important! First add clean
water to separate container.
Then slowly add CP 637 to
water while stirring by hand
or power mixer to ensure
smooth, lump-free mix. See
table above for mix ratio.
3. Work prepared mortar into
opening by troweling, pour-
ing, or pumping with suitable
pump. Use forms for large
openings. Make sure applica-
tion has been sealed accord-
ing to the applicable UL/cUL
Fire Resistance Directory or
Hilti Firestop Manual.
4. Fasten identification plate
(if required).
FILL, VOID OR CAVITY MATERIAL
FOR USE IN THROUGH-PENETRATION
FIRESTOP SYSTEMS
SEE UL FIRE RESISTANCE DIRECTORY
66Y7
Mix ratio (recommended, mortar to water):
Trowelable 30 lb (14.6 kg)  :2 U.S. gal (8 L)
Pourable 30 lb (14.6 kg)  :2.5 U.S. gal (9.5 L)
System Advantage / Customer Benefits
•Saves time
•Versatile
•Simple mixing