Sika Flex-221 SF
Chemical Resistance Caustic solutions, Chemical Resistance: Diluted acids, Chemical Resistance: Fluid Resistance: Fresh water resistance, Fuels, Chemical Resistance: Fluid Resistance: Limewater resistance, Mineral oils, Chemical Resistance: Fluid Resistance: Sea water resistance, Road salt, Sewage effluent, Vegetable and animal fats and oils Application Type Bond, Seal 1 Part or 2 Part 1-Part Material Form Paste Substrate Composites, FRP, Glass, Pre-painted metals, Plastics, Wood, Sealing materials with dissimilar coefficients of expansion, Galvanized steel, Anodized aluminum, Epoxy, Galvanized steel, ABS Industry Vehicle bodies, Transportation Manufacturer Sika Chemistry Solvent-free, Polyurethane, Urethane paint systems Cure Method Humidity Application Temperature (°F) 41 to 104 Cure Time (min) Fast Viscosity (cPs) Non-sag Color Gray: Aluminum Gray High Temperature Resistance (°C) 140, 120, 90 Low Temperature Resistance (°C) -40 Cut Resistance Excellent cut resistance Density (g/cm³) 10.8 (lb/gal) Key Specifications Meets ASTM C920 Type S, Grade NS, class 12.5, USDA (U.S. Department of Agriculture): USDA Approved for use on surfaces with the possibility of incidental food contact, TT (U.S. Federal Specification): S-00230C: Meets Federal specification TT-S-00230C, Type II, Class A., NSF Approved for use on surfaces with the possibility of incidental food contact
Technical Data for Sika Flex-221 SF
- Chemical Resistance : Fluid Resistance : Water Resistance - Fresh water resistance, Limewater resistance, Sea water resistance
- Chemical Resistance - Caustic solutions, Fuels, Mineral oils, Road salt, Sewage effluent, Vegetable and animal fats and oils
- Chemical Resistance : Acid Resistance - Diluted acids
1 Part or 2 Part
- Caulking gun - Power operated caulking gun
- Brush - Hand
- Moisture / Condensation Cure - Humidity
- Gray : Aluminum - Aluminum Gray
- ASTM (American Standard Test Method) - Meets ASTM C920 Type S, Grade NS, class 12.5
- National Sanitation Foundation - NSF Approved for use on surfaces with the possibility of incidental food contact
- USDA (U.S. Department of Agriculture) : Approved - USDA Approved for use on surfaces with the possibility of incidental food contact
- TT (U.S. Federal Specification) : S-00230C : Class A - Meets Federal specification TT-S-00230C, Type II, Class A.
Application Temperature (°F) 41 to 104 Cure Time (min) Fast Viscosity (cPs) Non-sag
General Bond Strength (psi) excellent Tear Strength (piw) Tear propagation resistance Tensile Strength (psi) 260 Test Method
Environmental Resistance Environmental resistance High Temperature Resistance (°C) 140, 120, 90 Low Temperature Resistance (°C) -40 Vibration Resistance/Shock Resistance Shock
Cut Resistance Excellent cut resistance Shore A Hardness 40 Test Method Elongation (%) 500 Test Method Flexibility Permanently elastic, Elastomeric
Glass Transition Temp (Tg) (°C) -45 % Solids (%) 100 Density (g/cm³) 10.8 (lb/gal)
Shelf Life Details Shelf life (storage below 80°F (25°C)) 3 months;Sikaflex®-221 SF must not be stored above 77°F. Shelf Life Temperature (°F) <77 Shelf Life (mon) 3
Best Practices for Sika Flex-221 SF
Clean, dry, free of water, oil, grease or rust, and of sound quality. Remove residue, splashes, etc. Clean surface with a strong jet of compressed air, sandblast, solvent. Pretest substrates for adhesion. Cleaners and/or primers may be required to achieve optimal adhesion. Please refer to the Surface Preparation Guidelines for specific application information. Advice on specific applications is available from the Technical Service Department of Sika Industry.
Recommended application temperatures: 40oF to 110oF. For cold-weather application, store units at approximately 70oF
remove just prior to using. Make sure joint is frost- free. Cut tip of plastic nozzle to joint size. Puncture air tight seal. Install with hand- or power-operated caulking gun. For best performance, Sikaflex®-221 SF should be gunned into joint when joint slot is midpoint of its designed expansion and contraction. To facilitate tooling, wet pointing tool or finger with soap solution. For advice on selecting and setting up a suitable pump system, as well as on the techniques of pump operated application, please contact the System Engineering Department of Sika Industry.
Sikaflex®-221 SF cures by reaction with atmospheric moisture. At low temperatures the water content of the air is generally lower and the curing reaction proceeds somewhat slower.
In case of spills or leaks, wear suitable protective equipment, contain spill, collect with absorbent material, and transfer to suitable container. Ventilate area. Avoid contact. Dispose of in accordance with current, applicable local, state, and federal regulations.
Uncured Sikaflex®-221 SF may be removed from tools and equipment with Sika® Remover-208 or an-other suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin should be washed immediately using a suitable industrial hand cleanser and water. Do not use solvents!
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Tack Free Time Test Methods
|Tack Free Time||Tack Free Temperature||Test Method|
Work / Pot Time Test Methods
|Work / Pot Time||Test Method||Temperature|
Tensile Strength Test Methods
|Tensile Strength||Test Method|
|260 psi||ASTM D 412|
Elongation Test Methods
|500 %||ASTM D 412, at Break|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method|
|40||ASTM D 2240|