Sikaflex 521UV
Sika Sika
  • Sikaflex 521UV

Sikaflex 521 UV

All purpose UV resistant Sealant. For use on ceramics, metals, plastics , fiberglass, and many types of paint. Very similar to 295 UV but with less adhesive strength. Sika 521 UV is a multi-purpose, UV resistant, non-sag, elastic, one-part silane-terminated polymer sealant, which cures on exposure to atmospheric moisture to form a durable elastomer. Sikaflex 521 UV is solvent and isocyanate free.
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Tech Spec Product Info User Generated Content

    Technical Specifications

  • Chemical Base : One-part polyurethane hybrid
  • Density : 11.9 lbs/gal approximately
  • Stability : Very Good
  • Cure Mechanism : Moisture Curing
  • Tack Free Time : 30 min approximately
  • Rate of Cure : 24 hours
  • Shore A hardness (ASTM D2240): 40 Approximately
  • Elongation at break (ASTM D412): >400%
  • Tensile Strength (ASTM D412): 40 Approximately
  • Application Temperature: 40 F to 110 F
  • Service Temperature: -40F to 190 F
  • Colors: Black, White
  • Shelf Life: 9 months
  • Sandable, paintable and is waterproof
Below Water Line (yes/no): Yes
BRAND: Sika
Material: Polyurethane
Rate Of Cure: Fast
Strength: Good
Type: Adhesive
Usage: Sealing
4.5 2

REVIEW SNAPSHOT®

by PowerReviews
Sikaflex 521 UV
 
4.5

(based on 2 reviews)

Ratings Distribution

  • 5 Stars

     

    (1)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

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    (0)

  • 1 Stars

     

    (0)

Reviewed by 2 customers

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4.0

512 UV Review

By Tool Hawk

from Alabama

About Me Advanced

Pros

  • Easy to Use
  • Protects Well
  • Visually Pleasing
  • Weather Proof

Cons

    Best Uses

    • Indoor
    • Outdoor

    Comments about Sikaflex 521 UV:

    I was expecting (hoping) this product to harden up, but it actually is much like regular white silicone caulk. I have no long term experience, but I hope it sticks better than silicone. The manufacturer does not identify a generic clean up solvent, but I think that mineral spirits would work based on what other manufacturers recommend.

    • Was this a gift?:
    • No
     
    5.0

    OUTSTANDING FOR RV'S

    By Teamccracing

    from Florida

    About Me Competitive

    Verified Reviewer

    Pros

    • Easy to Use
    • GREAT OVERALL PRODUCT FOR
    • NICE FINISHED LOOK
    • Protects Well
    • Visually Pleasing
    • Weather Proof

    Cons

      Best Uses

      • Outdoor

      Comments about Sikaflex 521 UV:

      I used this product because my rv repair shop had it in stock. I never tried it and it seemed a bit expensive. It is a great product worth the extra buck or two. I know it will cost me less in the long run after seeing the difference with it next to the cheap stuff I purchased at a home store!![...]

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