Sika Flex-221

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Description for Sika Flex-221

A high-quality, multi purpose, non-sag, polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer. Bonds well to a wide variety of substrates

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Chemical Resistance	Caustic solutions, Chemical Resistance: Diluted acids, Chemical Resistance: Fluid Resistance: Resistant to Fresh water, Vegetable and animal fats and oils, Chemical Resistance: Fluid Resistance: Resistant to Limewater, Mineral oils, Chemical Resistance: Fluid Resistance: Resistant to Sea water, Fuels, Sewage effluent
Application Type	Bond, Seal
1 Part or 2 Part	1-Part
Material Form	Paste
Substrate	Ceramic, Metal primers, Plastics, Wood, Metals
Industry	Agriculture Machinery, Transportation Exterior
Manufacturer	Sika
Chemistry	1-C polyurethane
Cure Method	Humidity
Application Temperature (°F)	41 to 104
Viscosity (cPs)	Non-sag
Color	Black, Brown, Gray, Colonial white, Gray: Aluminum gray, White
Aging Resistance	Ageing
High Temperature Resistance (°C)	140, 120, 90
Low Temperature Resistance (°C)	-40
Durability	Durable elastomer
Density (g/cm³)	10.6 (lb/gal)
Key Specifications	ANSI (American National Standards Institute): ANSI/UL 723, For US: Meets approvals ASTM C920 types, International Organization for Standardization, TT (U.S. Federal Specification): Federal Specifications TT-S-00230C

Best Practices for Sika Flex-221

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Technical Data for Sika Flex-221

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Overview

Chemical Resistance
- Chemical Resistance : Fluid Resistance : Water Resistance - Resistant to Fresh water, Resistant to Limewater, Resistant to Sea water
- Chemical Resistance - Caustic solutions, Fuels, Mineral oils, 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
- Ceramic
- Metal - Metal primers, Metals
- Plastic - Plastics
- Wood
Industry
- Agriculture Machinery
- Transportation Exterior
Chemistry
- Polyurethane - 1-C polyurethane
Cure Method
- Moisture / Condensation Cure - Humidity
Color
- Black
- Brown
- Gray
- Gray : Aluminum - Aluminum gray
- White - Colonial white
Key Specifications
- ASTM (American Standard Test Method) - For US: Meets approvals ASTM C920 types
- International Organization for Standardization
- ANSI (American National Standards Institute) : ANSI/UL 723
- TT (U.S. Federal Specification) : S-00230C - Federal Specifications TT-S-00230C

Specifications

Cure Specs

Application Temperature (°F)	41 to 104
Viscosity (cPs)	Non-sag
Linear Shrinkage (%)	5.00	Test Method

Bond Strength

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

Material Resistance

Non-Corrosive	Non-Corrosive
Aging Resistance	Ageing
Environmental Resistance	Environmental resistance
High Temperature Resistance (°C)	140, 120, 90
Low Temperature Resistance (°C)	-40

Hardness

Durability	Durable elastomer
Shore A Hardness	40	Test Method
Elongation (%)	500	Test Method
Flexibility	Elastic

Other Properties

Glass Transition Temp (Tg) (°C)	-45	Test Method
Density (g/cm³)	10.6 (lb/gal)

Business Information

Shelf Life Details	12 months Cartridges and Unipacs, (CQP 016-1), 6 months Drums and Pails, (CQP 016-1)
Shelf Life Temperature (°F)	<77, <77
Shelf Life (mon)	12, 6

Best Practices for Sika Flex-221

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1. Surface Preparation
  
  Surfaces must be clean, dry and free from all traces of grease, oil and dust. The substrates must be prepared in accordance with the instructions given in the current Sika Primer Chart. Advice on specific applications is available from the Technical Service Department of Sika Industry.
2. Application
  
  Cartridges: Pierce cartridge membrane.
  
  Unipacs: Place unipac in the application gun and snip off the closure clip. Cut off the tip of the nozzle to suit joint width and apply the sealant into the joint with a suitable hand operated or compressed air gun, taking care to avoid air entrapment. Once opened, packs should be used up within a relatively short time. Do not apply at temperatures below 40°F (5°C) or above 105°F (40°C). The optimum temperature for substrate and sealant is between 60°F (15°C) and 77°F (25°C). For advice on selecting and setting up a suitable pump system, as well as on the techniques of pump operated application.
3. Curing
  
  Sikaflex®-221 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
  
  Use personal protective equipment (chemical resistant gloves/ goggles/clothing). Without direct contact, remove spilled or excess product and placed in suitable sealed container. Dispose of excess product and container in accordance with applicable environmental regulations.
5. Removal
  
  Uncured Sikaflex®-221 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Strictly follow solvent manufacturer's warnings and instruction for use. Once cured, the material can only be removed mechanically. Hands and exposed skin should be washed immediately using a suitable industrial hand cleaner and water. Do not use solvents on skin!
Comparable Materials for Sika Flex-221

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Spec Engine^® Results
- Flex-291(Sika)
  A One-component, marine grade polyurethane elastomeric adhesive and sealant. Fast cure/tack-free time, NSF approved for potable water (black and white only), USDA approved for incidental food contact.
- Sikaflex-15 LM(Sika)
  A low-modulus, high-performance, 1- component, polyurethane-based, non-sag elastomeric sealant.
- Flex-221 SF(Sika)
  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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