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

Product ID: 519275485

📏Graduated marks every 2.5ml & 5ml

🧊Low-temp freeze safe polypropylene

🧪50ml precision capacity

¥14538

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧪 Elevate your lab game with precision and leak-proof confidence!

BULK PACK EFFICIENCY - 50-pack supply ideal for busy labs or professionals needing reliable, consistent sample containers.
LEAK PROOF SCREW CAP - Secure blue HDPE screw caps ensure zero spills, perfect for on-the-go sample handling.
SELF STANDING STABILITY - Innovative conical base design keeps tubes upright, minimizing workspace clutter.
PRECISION VOLUME CONTROL - Graduated markings in 2.5ml & 5ml increments for exact measurements every time.
DURABLE POLYPROPYLENE BUILD - Robust, low-temperature resistant PP material designed for long-term freezing and storage.

The CertBuy 50ml Plastic Centrifuge Tubes come in a 50-pack of durable, polypropylene conical tubes featuring graduated volume markings every 2.5ml and 5ml. Designed with self-standing bases and secure blue HDPE screw caps, these tubes offer leak-proof sample storage and are resistant to low temperatures, making them ideal for professional lab environments requiring reliable, precise, and efficient sample handling.

Specifications

ASIN	B07RS8VL7R
ASIN	B07RS8VL7R
Batteries Included?	No
Batteries Required?	No
Customer Reviews	4.6 4.6 out of 5 stars (175)
Customer reviews	4.6 4.6 out of 5 stars (175)
Date First Available	12 August 2019
Date First Available	12 August 2019
Item Weight	762 g
Manufacturer	CBTONE
Manufacturer	CBTONE
Manufacturer reference	CBUS-CentrifugeTube-50ML-50PCS-190510fa
Manufacturer reference	CBUS-CentrifugeTube-50ML-50PCS-190510fa
Material	Polypropylene (PP) Plastic
Package Dimensions	27.89 x 20.6 x 14.71 cm; 762 g
Package Dimensions	27.89 x 20.6 x 14.71 cm; 762 g
Part number	CBUS-CentrifugeTube-50ML-50PCS-190510fa

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¥14538

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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