Product
Sika Sikaflex-521 UV
300ml cartridge
One-part Silane Terminated Polymer (STP/MS-hybrid) adhesive-sealant. Manufacturer TDS explicitly lists ABS as a bonded substrate and rates the cured joint as ageing- and weathering-resistant.
This is ms polymer, so everything true of that chemistry applies here too.
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Specification
- Form
- Cartridge
- Working time
- 30 minutes
- Service temperature
- -50C to 90C
- Water resistance
- Water resistant
- Maximum service temperature
- 90.0000 C (continuous; tolerates 140C for 4h and 150C for 1h) Manufacturer verified
- Minimum service temperature
- -50.0000 C Manufacturer verified
- Manufacturer substrate wording
- bonds well to a wide variety of bonding surfaces such as metals, ABS, PC, FRP and wood Manufacturer verified
- UV resistance wording
- Ageing and weathering-resistant. Weathering-resistant 1-component Silane Terminated Polymer (STP) adhesive/sealant. Manufacturer verified
- Water resistance wording
- Generally resistant to fresh water, seawater, diluted acids and diluted caustic solutions. Manufacturer verified
- Working time
- 30.0000 minutes (Skin time at 23°C and 50% relative humidity, not full cure) Manufacturer verified
What it bonds
Where the manufacturer names a material, we quote them. Where we have assessed it ourselves, we say so and grade it lower. The two are never merged.
| Material | Basis | Manufacturer wording |
|---|---|---|
| ABS | Listed by the manufacturer A | “bonds well to a wide variety of bonding surfaces such as metals, ABS, PC, FRP and wood” |
| GRP / fibreglass | Listed by the manufacturer A | “bonds well to a wide variety of bonding surfaces such as metals, ABS, PC, FRP and wood” |
| Polycarbonate | Listed by the manufacturer A | “bonds well to a wide variety of bonding surfaces such as metals, ABS, PC, FRP and wood” |
| ASA | Our assessment: suitable C | ASA is not named in the TDS; the sheet's 'plastics' category is too vague to broaden into ASA per source policy. Assessed suitable from ASA sharing ABS's styrene-acrylonitrile matrix and similar medium surface energy. |
Preparation
Surfaces must be clean, dry and free from grease, oil and dust. Use the current Sika pre-treatment chart for the exact substrate and validate on original parts.
Limitations
Professional-use product. Stress-crack-prone materials and actual coatings require testing. General fresh/seawater resistance is not an immersion certification.