are these tubes leak proof when filled with liquids?

They're screw cap and pretty leak proof. I used them to collect 50 water samples locally, kept them in ziplocs with their respective collection survey, and nothing spilled.

How accurate is the graduation of these tubes?

Maybe the supplier has specs, but I suspect the precision is one of several more appropriate questions. It's not advertised as measuring liquids for quantitative analysis, just "solid, powder, seeds, pills, granular objects" but the volume is given to 1/10th of a milliliter. Being precise about the volume of a seed seems like an oxymoron, whereas powders are not. It will be interesting what answers you get!

Is the tube and cap pp5? I'm wondering if both can withstand an autoclave.

The description states the blue cap is HDPE and not PP. HDPE will not withstand the heat in an autoclave.

Is there a tube rack on amazon available for these tubes?

No specific idea, sorry, but rack is mentioned a lot on the product page. They do stand upright on their own.

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50ml Plastic Centrifuge Tubes with Screw Cap, CertBuy 50 Pack Self-Standing Plastic 50ml Test Tube Polypropylene Conical Tubes with Cap, Graduated Marks

Product ID: 130735273

📏Graduated marks every 2.5ml

🧊Low-temp freeze safe

🧪50ml precision capacity

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Description

🧪 Elevate your lab game with precision and reliability in every tube!

BULK PACK EFFICIENCY - 50-pack supply keeps your lab stocked and ready, eliminating downtime and last-minute orders.
LEAK PROOF SCREW CAP - Secure blue HDPE screw caps prevent spills and contamination, keeping your samples pristine.
SELF STANDING DESIGN - Freestanding conical tubes provide stability and easy access during busy lab workflows.
PRECISION VOLUME CONTROL - Graduated markings in 2.5ml increments ensure exact measurements for flawless sample handling.
DURABLE POLYPROPYLENE BUILD - Robust PP material withstands low temperatures and long-term freezing without cracking.

The CertBuy 50-pack of 50ml polypropylene centrifuge tubes features self-standing conical design with clear graduated markings every 2.5ml, secure blue HDPE screw caps for leak-proof sealing, and durability for low-temperature freezing. Ideal for precise sample storage and handling in professional lab environments.

Specifications

ASIN	B07RS8VL7R
Best Sellers Rank	#33,455 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in High-Speed Centrifuge Lab Tubes
Date First Available	May 9, 2019
Item Weight	1.68 pounds
Manufacturer	CBTONE
Package Dimensions	10.98 x 8.11 x 5.79 inches

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72453CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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