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Sikaflex®-252

Elastic adhesive for vehicle assembly bonding

Sikaflex®-252 is an elastic 1-component polyurethane adhesive especially designed for bonding large components in vehicle assembly. It is suitable for bonding coated metal, GRP, ceramic materials and plastics.

  • Bonds well to a wide variety of substrates
  • Capable of withstanding high dynamic stresses
  • 好gap-filling properties
  • Can be painted
  • Vibration-damping
  • Electrically non-conductive
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PRODUCT BENEFITS

  • Bonds well to a wide variety of substrates
  • Capable of withstanding high dynamic stresses
  • 好gap-filling properties
  • Can be painted
  • Vibration-damping
  • Electrically non-conductive

Areas of Application

Sikaflex®-252 is suitable for assemblies that are subject to dynamic stresses. Suitable substrate materials are timber, metals, particularly aluminum (including anodized components), sheet steel (including phosphated, chromated and galvanized components), metal primers and paint coatings (2-component systems), ceramic materials and plastics. Seek manufacturer’s advice before using on plastics that are prone to stress cracking. This product is suitable for professional experienced users only. Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.

Packaging

车tridge

300 ml
Unipack 400 ml
600 ml
Pail 23 l
Drum 195 l

Product Details

Typical Product Data
Chemical base

1-component polyurethane
Color (CQP001-1)

Black, white, grey
Cure mechanism

Moisture-curing
Density (uncured)

depending on color

1.2 kg/l
Non-sag properties

好
Application temperature

ambient

10─35°C
Skin time (CQP019-1)

40 minutesA
Open time (CQP526-1)

35 minutesA
Curing speed (CQP049-1)

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

50
Tensile strength (CQP036-1 / ISO 527)

3 MPa
Elongation at break (CQP036-1 / ISO 527)

400 %
Tear propagation resistance (CQP045-1 / ISO 34)

7 N/mm
Tensile lap-shear strength (CQP046-1 / ISO 4587)

2.5 MPa
Service temperature (CQP509-1 / CQP513-1)

4小时

1 hour

-40 ─ 90 °C

130 °C

150 °C
Shelf life

12 monthsB

CQP = Corporate Quality Procedure

A)23 °C / 50 % r. h.

B)storage below 25 °C
Technical Information

CURE MECHANISM

Sikaflex®-252 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_Sikaflex-250 PC-v19_07_Final

Diagram 1: curing speed Sikaflex®-252

CHEMICAL RESISTANCE

Sikaflex®-252 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, dust and contaminants.

The 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®-252 can be processed between 10 °C and 35 °C (climate and product) 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.

Consider that the viscosity will increase at low temperature. For easy application, condition the adhesive at ambient temperature prior to use. To ensure a uniform thickness of the bondline it is recommend to apply the adhesive in form of a triangular bead (see figure 1).

Grafik Klebstoffauftrag

Figure 1: Recommended bead configuration

Sikaflex®-252 can be processed with manual, pneumatic or electric driven piston guns as well as pump equipment. The open time is significantly shorter in hot and humid climate. The parts must always be installed within the open time. Never join bonding parts if the adhesive has built a skin.

Tooling and finishing

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

Removal

Uncured Sikaflex®-252 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 hand wipes such as Sika® Cleaner-350H or a suitable industrial hand cleaner and water.

不要使用所以lvents on skin.