Have any of these that can handle up to 300F?

Heat is bad for magnets I wouldn't try it....

Would these hold tin cans of food to the top of a wire pantry shelf?

I tested this, and yes it will hold a regular can 14 oz. But NOT a larger can 20oz. Green beans and cranberries in my regular cans. Chilli in a big can was too heavy. Hope that helps.

I need to mount a power strip to a metal desk, would these be strong enough to hold the weight of the strip and the cords?

There are many power strips on the market that have built in magnets for mounting to the side of a tool box or other metal surface, and a very strong majority of them come from the same country. There is no reason why you wouldn't be able to use these magnets for that same purpose. As mentioned in another answer, you're probably going to need a stronger double sided tape to mount the magnet to your power strip. 3M makes a VERY strong double sided tape, I believe they call it VHB, that tape would be perfect for your application.

Can these be used to hold cabinet doors closed in an earthquake? If they are applied to both the door and the shelf? But adhesive not come off? Wood?

I don't use the adhesive strips so not sure how well they attach to wood but you could always find a stronger adhesive. The magnets themselves would absolutely hold the doors closed. They would almost be too strong. Possibly having the magnet on one side and a metal strip on the other would be better.

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25 Pack Neodymium Bar Magnets, Powerful Rare Earth Magnets - Industrial Strength NdFeB Magnet Set for Fridge DIY Crafts - 60 x 10 x 3 mm

Product ID: 173152988

Details

Brand
DIYMAG
Color
Silver
Material
Neodymium
Product Dimensions
2.36"L x x
Shape
Rectangular

✨Ni+Cu+Ni triple-layer coating - rust resistant shine

📏60x10x3 mm - precision bar size

🧲18 lb pull force - industrial strength

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Description

🧲 Elevate your DIY game with industrial-strength magnets that stick with you!

MULTIPURPOSE MAGNET SET - Ideal for fridge art, classroom science, shower doors, and industrial applications—your creative toolkit essential.
FRAGILITY MEETS STRENGTH - Handle with care to avoid chipping, but enjoy the rare earth magnet’s unmatched holding power.
UNMATCHED MAGNETIC POWER - Each magnet delivers a robust 18 lb pull force, ensuring your projects stay firmly in place.
PREMIUM TRIPLE LAYER COATING - Ni+Cu+Ni finish offers superior rust resistance and a sleek, polished look that lasts.
PERFECTLY SIZED FOR VERSATILITY - Compact 60x10x3 mm bars fit seamlessly into DIY crafts, office setups, and scientific experiments.

DIYMAG’s 25-pack of neodymium bar magnets combines industrial-grade 18 lb pull force with a durable Ni+Cu+Ni triple-layer coating, delivering rust-resistant, precision-sized (60x10x3 mm) magnets perfect for crafts, scientific projects, and everyday magnetic needs.

Specifications

ASIN	B081TZ6CYT
Best Sellers Rank	#2,347 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #36 in Rare Earth Magnets
Brand Name	DIYMAG
Color	Silver
Customer Reviews	4.3 4.3 out of 5 stars (12,954)
Included Components	Material Handling; Pulling & Lifting Equipment; industrial-rare-earth-magnets
Item Dimensions L x W x Thickness	2.36"L x 0.39"W x 0.12"Th
Item Thickness	0.12 inches
Manufacturer	DIYMAG
Material Type	Neodymium
Model Number	60x10x3_40x10x5
Number of Items	25
Number of Pieces	25
Part Number	F60103-25Pack
Pull Force	18 pounds
Shape	Rectangular
UPC	616833188107 850077560644
Unit Count	25 Count

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$48.48

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In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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