Sika
Sikaflex 221 One-Component Adhesive Sealant
Sikaflex 221 One-Component Adhesive Sealant
$13.00Limited StockSee Product Details
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SIK-221242 -- 10.3 oz Cartridge - Aluminum GraySIK-221243 -- 10.3 oz Cartridge - BlackSIK-221245 -- 10.3 oz Cartridge - Colonial WhiteSIK-221241 -- 10.3 oz Cartridge - WhiteSIK-221242-24 -- 10.3 oz Cartridge (24 Pack) - Aluminum GraySIK-221243-24 -- 10.3 oz Cartridge (24 Pack) - BlackSIK-221241-24 -- 10.3 oz Cartridge (24 Pack) - WhiteQuantity
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Product Details
Sikaflex 221 bonds well to a wide variety of substrates and is suitable for making permanent, high adhesive strength elastic seals. Use 221 on substrate materials wood, metals, metal primers and paint coatings (2c or 2 part systems), ceramic materials and plastics.
Tech Specs
| Sealant type: Polyurethane | Temperature: -40 to 195 F |
|---|---|
| Time until tack free: 60 min | Full cure time: 60 min to 10 days |
| Tensile Strength: 260 | Hardness: Shore A 40-45 |
| Specific Gravity: 1.27 | Elongation: 500% |
Info & Guides 1-Component Formulation (1C)
Elastic
Low Odor
Resistant to aging and weathering exposure
Non-corrosive
Can be painted over
Can be sanded
Bonds well to a wide variety of substrates
NSF-approved for incidental food contact and potable water.
Sikaflex-221 is a high-quality multi purpose non-sagging 1-component polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer.
Key Features
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Reviews
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11 to 15 of 16 Reviews
11 – 15 of 16 Reviews
Most Recent
Oxford, OH
5 out of 5 stars.
Great stuff to seal horse trailer roof.
12 years ago
Used it to seal the aluminum seals on the roof of a Sundowner Horse trailer. It worked great. Using a curved piece of metal to shape and grade the calk in places is a big help.
Helpful?
North Carolina
4 out of 5 stars.
Works as advertised
12 years ago
Used to reseal an aluminum horse trailer and it worked well. Product was easy to use and dried flexible but firm. Time will tell how the product stands up over time but it has already served the purpose
Helpful?
Tunnel Hill Ga
4 out of 5 stars.
Great Product
14 years ago
*This product was used to fix rear glass window on convertible. *Its Works!!! *Messy, but easily clean up with acetone solvent
Helpful?
Monroe, NC 28112
5 out of 5 stars.
excellent adhesive caulk; sticks to all
14 years ago
I use this product for a number of high end residential house construction projects. Bonding and waterproofing are its best qualities. It is a ureathane caulk so it is a little messy and any caulk that gets away needs to be cleaned/wiped up immediately to keep from getting onto everything. The product is better for cleanup and smoothing out then older formulas of Sikaflex caulk. Great product. I use a fair amount of it. Jim Zynsky Comfort Green Buildings Monroe, NC 28112
Helpful?
Sacramento, CA
5 out of 5 stars.
Stuff was good in 1987, still good now
15 years ago
The instruction video that came with my 1987 convertible BMW showed SikaFlex 221 being used. Looked around online and found JD's website. It's easy to apply, it's easy to mold, and it will stay on for over 20 years like the previous application did. Good stuff, and easy to get at JD's.
Helpful?
1 Ratings-Only Review
11 – 15 of 16 Reviews
Questions
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1 - 10 of 39 Questions
Q: Not really a quest but just wanted to add that my company has used sikaflex for years to seal military contract office and communications trailers and this stuff does the job! It passes military grade rain testing again and again, I would recommend this stuff to anyone! Best product out there in my opinion!
2 years ago1 Answer
A: Hey Jim, Thank you for sharing your feedback!
2 years agoHelpful?
Q: will this work to adhere a loose windshield cowl? How much do I need?
5 years ago1 Answer
A: Should work stays flexible - not sure on how much
5 years agoHelpful?
Q: Do you have to use a primer with Sikaflex 221? I am bonding plexiglass to an aluminum window frame in a travel trailer.
5 years ago1 Answer
A: Not sure did not need primer on fiberglass and two years strong with no problems!
5 years agoHelpful?
Q: Will this product stick to Hypalon to repair transom joints on an inflatable boat? Can it be applied over old contact cement residue and still adhere with a strong bond?
6 years ago2 Answers
A: We used it on an aluminum horse trailer roof. It did adhere to the old cement which was the same product only, many years old.
6 years agoHelpful?
Q: Can sicaflex 221 be used on frp
7 years ago1 Answer
A: YES
7 years agoHelpful?
Q: What is the adhesive strength? Is it like 5200 or 4200. IO want to use it on a hatch that at some future time may need to be disassembled. Thank you.
9 years ago3 Answers
A: I'm sorry I cannot answer this question. I used the product to seal the joints of an aluminum horse trailer. It worked beautifully.
9 years agoHelpful?
Q: Does this product work when it is applied underwater?
9 years ago1 Answer
A: No, surface must be clean and dry.
9 years agoHelpful?
Q: using on blackwater vent pipe where it connects to tank will this work?
9 years ago4 Answers
A: Depends on what you are using it for. If you are trying to repair a broken part it probably wont work for you as this stuff is pretty pliable when it cures. If you are sealing the threads then it may work, but there are cheaper alternatives. This is really good for sealing things like seams or moldings to prevent water intrusion. The adhesive properties of this stuff are great and it stands up to the sun really well. I have used it on plastic fiberglass, and aluminum and I have not found a sealer that works beter. Be advised though, only buy as much as you can use. The shelf life is not good and once it starts to set up it is useless.
9 years agoHelpful?
Q: need to seal stainless steel seams in a swimming pool, in Michigan, is the product resistant to chemicals and cold?
9 years ago4 Answers
A: Yes, should work great for that. We use it on waterslide seams and it's the best stuff we've found.
9 years agoHelpful?
Q: how much tube we need of sikaflex 221 if we have 3meter x 2cm x 2cm surface? one tube is how much surface it will take?
9 years ago1 Answer
A: One tube should cover your requirements plus some left over.
9 years agoHelpful?
1 - 10 of 39 Questions