Sikaflex 521UV, the all-rounder for workshop and camper construction, bonding and sealing

Weather-resistant STP adhesive and sealant with a broad adhesion spectrum

Sikaflex®-521 UV is a weather-resistant, one-component STP adhesive and sealant with good adhesion to a wide range of substrates such as metals, ABS, PC, FRP and wood where no special pre-treatment is usually required. This universal product is suitable for interior and exterior sealing.

• Resistant to ageing and weathering
• Good adhesion to a wide range of substrates without special pre-treatment
• Free from isocyanate and solvents

PRODUCT ADVANTAGES

• Resistant to ageing and weathering
• Good adhesion to a wide range of substrates without special pre-treatment
• Free from isocyanate and solvents
• Can be painted over
• Sandable
• Low odor

Application

• Surface pre-treatment

The bonding surfaces must be clean, dry and free of grease, oil and dust. The surface pre-treatment depends on the specific nature of the substrate and is crucial for a durable bond. Instructions for substrate pre-treatment can be found in the current Sika® pre-treatment table. The information contained therein is based on experience and must always be verified by preliminary tests with original materials.

We recommend pre-treatment with SikaPrimer 207 Link for all surfaces except wood.

• Application

Sikaflex®-521 UV can be processed between 5 °C and 40 °C. Changes in reactivity and application properties must be taken into account. The optimum temperature for substrate and sealant is between 15 °C and 25 °C.

Apply Sikaflex®-521 UV with a suitable cartridge/bag gun or pump system. Information on selecting and setting up a suitable pump system can be obtained from System Engineering at Sika Industry.

• Smoothing

Smoothing must be carried out before the sealant forms a skin. For smoothing we recommend Sika® Smoothing Agent N Link. Other smoothing agents must be tested for their suitability.

• Removal

Uncured Sikaflex®-521 UV can be removed from tools and equipment with Sika® Remover-208 Link or other suitable solvents. Cured material can only be removed mechanically.

Hands/skin must be washed immediately with suitable cleaning cloths (e.g. Sika® Cleaner-350H) or industrial hand cleaners and water. No solvents on the skin!

Shipping costs:

Normal package: 9.
PRIO Normal package: 15.
Bulky goods package: 29.
Prio bulky goods package: 39.00
3x or more bulky goods parcels: 49.00
Prio 3x or more bulky goods parcels: 69.00
Piece goods: 99.
Collection: Free of charge

We deliver throughout Switzerland and to Liechtenstein. 

The costs are displayed in the checkout BEFORE payment. 

Bulky goods packages Parts with one side longer than 1 meter, e.g. Armaflex, solar, felt, aluminum profiles... 

General cargo: These are some batteries or large items that have to be shipped by freight forwarder. (Air conditioners...)

PRIO (selectable in the checkout at an additional cost) means that we pack these parcels first and hand over orders to the post office by 16:00 on the same day. These parcels are handed over to the post office with PRIO stickers and should arrive the next day. 

A pick-up in Winterthur can be selected at check-out. Please leave your email so that our system can let you know when it is ready for collection. (Usually happens within 24 hours)