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

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 & 5ml for precise measurement

🧊Polypropylene material withstands low-temp freezing

🧪50ml capacity for versatile sample sizes

¥12684

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Description

🧪 Elevate your lab game with precision, durability, and style!

BUILT TO ENDURE - Durable polypropylene construction resists cracking and withstands long-term freezing conditions.
STAND OUT IN THE LAB - Self-standing conical design offers stability and easy handling, perfect for multitasking pros.
BULK READY FOR ACTION - 50-pack supply keeps your workflow uninterrupted and your lab fully stocked.
LEAK PROOF CONFIDENCE - Snap-on blue HDPE screw caps provide a secure, spill-resistant seal for worry-free storage.
PRECISION AT YOUR FINGERTIPS - Graduated markings in 2.5ml & 5ml increments ensure exact sample measurement every time.

The CertBuy 50 Pack 50ml polypropylene centrifuge tubes feature a self-standing conical design with clear graduated markings every 2.5ml and 5ml. Equipped with leak-resistant blue HDPE screw caps, these tubes are ideal for precise sample handling and long-term low-temperature storage. Perfect for professionals seeking reliable, bulk-ready lab supplies.

Specifications

ASIN	B07RS8VL7R
Best Sellers Rank	#20,796 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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¥12684

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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