Sika Flex-221 SF

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Description for Sika Flex-221 SF

A solvent-free, 1-component, fast curing, polyurethane-based, elastomeric sealant. A moisture-cured, non-sag system. Remains permanently elastic, and is suitable for sealing materials with dissimilar coefficients of expansion.

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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

Best Practices for Sika Flex-221 SF

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Technical Data for Sika Flex-221 SF

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Overview

Chemical Resistance
- 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
Application Type
- Adhesive - Bond
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Paste
Substrate
- Glass
- Dissimilar Substrates - Sealing materials with dissimilar coefficients of expansion
- Metal - Pre-painted metals
- Galvanized - Galvanized steel
- Plastic - Plastics
- Epoxy
- ABS
- Wood
- Anodized Aluminum
- Composites - FRP
- Galvanized Steel
- Other - Galvalume, RIM, SMC
Industry
- Transportation
- Other Transportation - Auto trim, Cab construction including panels, Underbody components, Body seams
- Automotive - Vehicle bodies
- Construction - Roofing
- Packaging
Chemistry
- Solvent-Free
- Polyurethane - Urethane paint systems
Application Method
- Caulking gun - Power operated caulking gun
- Brush - Hand
Cure Method
- Moisture / Condensation Cure - Humidity
Color
- Gray : Aluminum - Aluminum Gray
Key Specifications
- 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.

Specifications

Cure Specs

Application Temperature (°F)	41 to 104
Cure Time (min)	Fast
Viscosity (cPs)	Non-sag

Bond Strength

General Bond Strength (psi)	excellent
Tear Strength (piw)	Tear propagation resistance
Tensile Strength (psi)	260	Test Method

Material Resistance

Environmental Resistance	Environmental resistance
High Temperature Resistance (°C)	140, 120, 90
Low Temperature Resistance (°C)	-40
Vibration Resistance/Shock Resistance	Shock

Hardness

Cut Resistance	Excellent cut resistance
Shore A Hardness	40	Test Method
Elongation (%)	500	Test Method
Flexibility	Permanently elastic, Elastomeric

Other Properties

Glass Transition Temp (Tg) (°C)	-45
% Solids (%)	100
Density (g/cm³)	10.8 (lb/gal)

Business Information

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

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1. Surface Preparation
  
  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.
2. Application
  
  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.
3. Curing
  
  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.
4. Clean-Up
  
  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.
5. Removal
  
  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!
Comparable Materials for Sika Flex-221 SF

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Spec Engine^® Results
- GPS1(Bostik)
  A one-component, moisture curing urethane sealant.
- Flex-511(Sika)
  A multi-purpose non-sag, elastic one-part sealant based on silane-terminated polymer technology, which cures on exposure to atmospheric moisture to form a durable elastomer. Resistant to UV radiation. Very low VOC/solvent free, silicone and PVC-free, Isocyanate-free.
- Everbuild Tecnic Hybriflex FR(Sika)
  A one part, chemically curing solvent free sealant and adhesive combining the best qualities of silicone and polyurethene techno-logies. Can be applied on damp/wet surfaces.
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