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All Categories > Chemical Resistant Caulking and Joint Sealants > CF-621 Chem Flex Flexible Epoxy Joint Filler > Item # - CF-621

Item # CF-621, CF-621 Chem Flex Flexible Epoxy Joint Filler

Chem-Flex CF-621 is a two component 100% Solids Flexible Epoxy Joint Filler designed to fill and protect saw cut/control joints in on-grade concrete slabs and to repair existing damaged control joints and cracks. CF-621 has excellent heavy load traffic bearing properties and bond strength. CF-621 has outstanding recovery when the joint material has been stretched.

Clean Up
Clean Up immediately with SA-17 Clean Up Thinner, or S-74 Reducer. These clean up solvents are flammable. Keep away from all sources of ignition.

Shelf Life
The shelf life of CF-621 is in excess of 12 months when stored at 50 ºF-90 ºF or below.

Features
1. Up to 100% Elongation.
2. Good resistance to steel wheel traffic.
3. Very resilient and tough.
4. Outstanding water tight bond to concrete
5. Helps to prevent erosion of control joint edges
6. Self leveling
7. Easy to work with, cold applied, no special equipment needed.
8. Excellent adhesion to concrete.
9. USDA Approved

Volume Solids100 percentage
ColorGray
Shore A Hardness70 - 80
Elongation (ASTM D638)80% to 100%
Tensile Strength (ASTM D638)600 psi
Tear Resistance (ASTM D624 73)30 lb/in
Artificial Weathering (ASTM G23-75 Type D)10 - 15% elastomeric property change after 1000 hours. (fed Spec TT-5-00227E)
Mixing Ratio1:1 by volume, mix 1 part A base with 1 part B hardener
Bond Cohesion After Water ImmersionNo Failure after 25% total movement
Cure TimeSet hard: 8 - 10 hours; full cure 5 - 7 days.
Application Temperature55 to 120 ºF
ApplicationPour, tool or caulking gun
Theoretical Coverage (2 gal. unit)1/4" x 1" = 154 linear feet
Min. Joint Width1"
Max. Joint Width3/4"
Pot Life20 minutes at 70 ºF
ThinningNone
Clean UpS-74 
SA-17
Packaging10 gal. units 
2 gal. units
Shelf Life>12 months when stored at 50 ºF - 90 ºF or below.
Uses
CF-621 is designed for saw cut/control joints and cracks in concrete slabs on grade. Ideal for most type services in chemical processing plants, pulp and paper mills, sewage and waste treatment facilities, warehouses, fertilizer plants, petroleum refineries, electric generating stations, coal handling operations, marine installations, etc.
Surface Preparation
New concrete must be cured at least a minimum of 28 days before applying CF-621. All laitance, efflorescence, sealers, curing compounds, chemical contaminants, grease, oil, and other foreign material must be removed. The prepared surface must be clean, dry and structurally sound. High pressure water clean, or dry abrasive blast may be necessary to clean existing joints.
Mixing Instructions & Application Procedure
Mixing Instructions
Best results are obtained if both Base and Hardener are stored at or above 75 ºF for 24 hours prior to mixing to insure normal viscosity.

CF-621 is prepared by mixing 1 part Base (Part A) to 1 part Hardener (Part B) by volume with a slow speed explosion proof drill with a Jiffy mixer for approximately 2-3 minutes.

Application Procedure
The minimum depth of the joint should be 1". The maximum width should be 3/4". Backer rod is not recommended. CF-621 is a full depth joint filler.

For joints wider than 3/4" make an Epoxy mortar out of the PC-1000. Apply and pack into en tire joint. Allow to cure for 24 hours then saw cut down the middle to create the new joint.

CF-621 may be applied by pouring, tooling or with a caulking gun. Two passes may be required as pourable materials have a tendency to dish out. The filled joint must be flush with the floor. CF-621 is designed for saw cut/control joints. Do not use on expansion joints.
Cautions
CF-621 Flexible Epoxy is not a fire hazard; the flash point is above 200 ºF. However, under conditions of fire it will burn and release potentially toxic fumes.

The Base portion is relatively inert physiologically. The Hardener portion contains amines and related materials. These can cause irritations and possibly chemical bums to the skin and eyes. This is also true for mixtures of Base and Hardener.

Wear safety glasses, gloves, and protective clothing when using CF-621 Flexible Epoxy.

In case of eye contact, flush with water for at least 15 minutes. For skin contact, wash with soap and warm water. Clean contaminated clothing before reuse.

This product is sold without warranty as to performance expressed or implied. Users are urged to make their own tests to determine the suitability for their particular conditions.

For Professional use only.
For Industrial use only.
Keep away from children.