Can these be autoclaved?

I would have to assume so. They’re scientific instruments. Generally, with a few exceptions, there designed to be regularly sterilized. I regularly send mine through a pressure cooker at 15 PSI in liquid cultures

Could these be used with a sensor for an alarm system (Simplisafe)? I have double hung windows so need a slim magnet to put opposite the sensor. Thx

Probably, but I suspect it would be much easier to use one of these that's the size you want: https://www.amazon.com/s?k=neodymium+disc+magnets&crid=3RBE9SKKGYW9W&sprefix=Neodyn%2Caps%2C235&ref=nb_sb_ss_ts-doa-p_5_6

is there any possibilities that these could degrade and leak into the water? any easy way to see it? thanks

There is nothing to leak. Inside is a solid magnet. It's possible that after using them a long time, friction could wear out the plastic coating, but that will probably take years and you'll see it slowly degrading. Just take a quick glance before you use them and if they look like they are in good condition, they are.

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Weewooday 36 Pieces PTFE Magnetic Stir Bar Lab Stirrer,35 Mm/ 1.38 Inch

Product ID: 332437659

Details

Brand
Weewooday
Color
white
Material
Magnetic Steel
Product Dimensions
6.5"L x 3.54"W
Shape
Cylindrical

🔥High temperature & corrosion resistant PTFE coating

🧲Strong magnetic force for stable stirring

⚙️Smooth cylindrical design reduces friction

Description

🧪 Stir Smarter, Not Harder — Elevate Your Lab Game with Weewooday!

VERSATILE COMPATIBILITY - Perfectly sized at 35mm to fit most beakers, jars, and stir plates for seamless integration.
EFFORTLESS SMOOTH MIXING - Cylindrical shape and ultra-low friction surface guarantee stable speed with zero deviation.
UNMATCHED MAGNETIC POWER - Engineered with premium magnetic steel to ensure consistent, vortex-inducing rotation every time.
DURABILITY MEETS PRECISION - PTFE coating resists abrasion, corrosion, and high heat—built to last through countless lab sessions.
BULK PACK FOR LAB EFFICIENCY - 36 pieces in one set to keep your workflow uninterrupted and your experiments on point.

The Weewooday 36-piece PTFE magnetic stirrer bar set features 35mm cylindrical bars crafted from magnetic steel with a high-grade PTFE coating. Designed for high-temperature resistance, corrosion protection, and smooth, stable rotation, these bars are ideal for scientific research, industrial labs, and academic settings. Compatible with most magnetic stirrers and heating plates, this bulk pack ensures reliable, efficient mixing for a variety of applications.

Specifications

ASIN	B093T6STDD
Best Sellers Rank	#16,011 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #34 in Lab Stirrers
Brand Name	Weewooday
Color	white
Customer Reviews	4.7 4.7 out of 5 stars (1,728)
Item Dimensions L x W x Thickness	6.5"L x 3.54"W x 0.79"Th
Item Highlight	Stainless Steel Laboratory Ptfe Stirrer Plate Bar, Pill-shaped Mixing Plate Magnetic Stick, Laboratory Use, White Color
Item Thickness	0.31 inches
Manufacturer	Weewooday
Material Type	Magnetic Steel
Model Number	Weewooday-PTFE Magnetic Stirrer-01
Number of Items	36
Number of Pieces	36
Part Number	Weewooday-PTFE Magnetic Stirrer-01
Shape	Cylindrical
Unit Count	36 Count

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