Sikaflex®-215
Brushable seam sealant for low bake paint cycle conditions
Sikaflex®-215 is a brushable 1-component polyurethane sealant. It has been designed for seam sealing applications on e-coated surfaces. Sikaflex®-215 can be painted and withstand common industrial paint oven conditions.
- Can be painted
- Withstands paint oven condition even up to 120 °C
- Can be pumped over long distances
- Very good application properties
- Easy to brush
- Low odor and free of solvents
Overview
PRODUCT BENEFITS
- Can be painted
- Withstands paint oven condition even up to 120 °C
- Can be pumped over long distances
- Very good application properties
- Easy to brush
- Low odor and free of solvents
Areas of Application
Sikaflex®-215 has been designed for seam sealing applications on e-coated chassis and body structures in the transportation and collision repair industry. It withstands paint oven temperatures even up to 120 °C for max. 2 hours. Sikaflex®-215 is applied in bead form and can be easily brushed or smoothed to get the desired finish. It must be painted if used on exterior joints. Seek manufacturer’s advice and perform tests on original substrates before using Sikaflex®-215 on materials prone to stress cracking. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.Product Details
| Chemical base | 1-component polyurethane | |
| Color (CQP001-1) | White, grey | |
| Cure mechanism | Moisture-curing | |
| Density (uncured) | depending on color | 1.40 kg/l |
| Application temperature | ambient | 5 ─ 40 °C |
| Skin time (CQP019-1) | 20 minutes A | |
| Curing speed (CQP049-1) | (see diagram) | |
| Shrinkage (CQP014-1) | 1.5 % | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 55 | |
| Tensile strength (CQP036-1 / ISO 527) | 1.4 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 170 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 6 N/mm | |
| Service temperature (CQP513-1) | -50 ─ 90 °C | |
| Shelf life | drum cartridge | 9 months B 12 months B |
CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) storage below 25 °C |
CURE MECHANISM
Sikaflex®-215 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).
Diagram 1: Curing speed Sikaflex®-215
CHEMICAL RESISTANCE
Sikaflex®-215 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
Surface preparation
Surfaces must be clean, dry and free from grease, oil, dust and contaminants.
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®-215 can be processed between 5 °C and 40 °C (climate and product) but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and process material is between 15 °C and 25 °C.
Sikaflex®-215 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 product. Do not use any tooling agent, since it might impair a good painting process.
Removal
Uncured Sikaflex®-215 may 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.
Do not use solvents on skin.
Overpainting
Sikaflex®-215 can be painted in fresh or cured state. Recommended thickness of Sikaflex®-215 is up to 3 mm. Baking temperature must not exceed 120 °C.
Due to the wide variety of paints preliminary trials under manufacturing conditions are required.
The elasticity of paints is usually lower than that of sealants. This could lead to cracking of the paint in the joint area.