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Sikaflex®-227

Sikaflex®-227

1-component fast skinning sealant

Sikaflex®-227 is a 1-component polyurethane sealant designed for car body sealing. It adheres well to a wide variaty of substrates and cures on exposure to atmospheric moisture.  

  • Excellent application properties, overhead work possible.
  • Fast skinning time
  • Can be painted, sanded
  • Bonds well to a wide variety of substrates
  • Resistant to ageing
  • Silicon free
  • Low odor
 
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PRODUCT BENEFITS

  • Excellent application properties, overhead work possible.
  • Fast skinning time
  • Can be painted, sanded
  • Bonds well to a wide variety of substrates
  • Resistant to ageing
  • Silicon free
  • Low odor
 

Areas of Application

Sikaflex®-227 is suitable for sealing, seam
sealing, simple bonding as well as for vibration reduction and sound dampening measures in collision repair and vehicle body construction. Suitable substrates are metal primers and paint coatings (2-c systems), metals, painted plastics and plastics.
Seek manufacturer’s advice and perform tests on original substrates before using Sikaflex®-227 on materials prone to stress cracking.
This product is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.  

Product Details

Typical Product Data
Chemical base

1-component polyurethane

Color (CQP001-1)

Black, grey, white

Cure mechanism

Moisture-curing

Density (uncured)

depending on color

1.3 kg/l

Non-sag properties

Good

Application temperature

ambient

5 ─ 35 °C

Skin time (CQP019-1)

40 minutes A

Curing speed (CQP049-1)

(see diagram)

Shrinkage (CQP014-1)

5 %

Shore A hardness (CQP023-1 / ISO 48-4)

40

Tensile strength (CQP036-1 / ISO 527)

1.7 MPa

Elongation at break (CQP036-1 / ISO 527)

600 %

Tear propagation resistance (CQP045-1 / ISO 34)

6 N/mm

Service temperature (CQP513-1)-50 ─ 90 °C
Shelf life

12 months B

CQP = Corporate Quality Procedure

A) 23 °C / 50 % r. h.

B) storage below 25 °C
Technical Information

CURE MECHANISM

Sikaflex®-227 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 (see diagram 1).

en_PNG_01-diagram-sikaflex-227

Diagram 1: Curing speed for Sikaflex®-227

CHEMICAL RESISTANCE

Sikaflex®-227 is generally resistant to fresh water, seawater, diluted acids and diluted caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, glycolic alcohol, concentrated mineral acids and caustic solutions or solvents.

Application

Application Information

Surface preparation

Surfaces must be clean, dry and free from grease, oil and dust.

Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. Suggestions for surface preparation may be found on the current edition of the appropriate Sika® Pre-Treatment Chart. Consider that these suggestions are based on experience and have in any case to be verified by tests on original substrates.

Application

Sikaflex®-227 can be processed between 5 °C and 35 °C but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and sealant is between 15 °C and 25 °C.

 

Sikaflex®-227 can be processed with manual, pneumatic or electric driven piston guns as well as pump equipment. For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

Tooling and finishing

Tooling and finishing must be carried out within the skin time of the sealant. It is recommended using Sika® Tooling Agent N. Other finishing agents must be tested for suitability and compatibility prior the use.

Removal

Uncured Sikaflex®-227 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin have to be washed immediately using Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water.

Do not use solvents on skin.

Overpainting

Sikaflex®-227 can be painted after formation of a skin. If the paint requires a baking process, best performance is achieved by allowing the sealant to fully cure first. 1C-PUR and 2C-acrylic based paints are usually suitable. All paints have to be tested by carrying preliminary trials under manufacturing conditions.
The elasticity of paints is usually lower than that of sealants. This could lead to cracking of the paint in the joint area.