Can these be washed in the dishwasher, top rack?

From what I can observe, the should be ok in a dishwasher but I'd try to avoid the heated drying cycle. This just my opinion/experience. I use them in the field and at the end of the day just swish them in some soapy water and then rinse and let dry

How heat tolerant is the item?

They did fine outside during summer for my monarch caterpillars - But not sure what type of heat you are referring to

Are they autoclaveable?

It is supposed to be, but they warp when autoclaved

can these hold soda bottle preforms?

No, they hold 50 mL test tubes.

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🧪 Elevate your lab game with the ultimate 3-tier test tube rack!

MODULAR PORTABLE - Three detachable levels let you customize and store effortlessly.
COMPACT YET SPACIOUS - Fits perfectly on any lab bench without compromising capacity.
DURABLE LIGHTWEIGHT - Solid plastic construction ensures long-lasting use without the bulk.
MAXIMIZE YOUR LAB EFFICIENCY - Organize up to 60 test tubes with a sleek, space-saving design.
EFFORTLESS SETUP MAINTENANCE - Quick assembly and easy cleaning keep your workflow smooth.

The POCOMOCO 3 Pack Plastic Test Tube Rack features 60 holes designed for 16mm tubes, arranged in three detachable, lightweight tiers. Made from durable solid plastic, it offers easy assembly, portability, and hassle-free cleaning—perfect for professionals seeking organized, efficient lab storage.

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