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 & 5ml for precise measurement

🧊Polypropylene material withstands low-temp freezing

🧪50ml capacity for versatile sample sizes

R1573

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧪 Elevate your lab game with precision, protection, and performance!

BULK PACK EFFICIENCY - 50-pack supply keeps your workflow uninterrupted, ideal for high-demand environments and large-scale projects.
LEAK PROOF CONFIDENCE - Snap-on blue HDPE screw caps provide a secure seal, eliminating spills and contamination risks during transport or storage.
STAND TALL WORK SMART - Self-standing conical design offers stability and easy handling, perfect for busy labs and on-the-go professionals.
FREEZE READY DURABILITY - Crafted from premium polypropylene, these tubes endure long-term freezing without cracking or warping.
PRECISION AT EVERY MARK - Graduated volume markings in 2.5ml & 5ml increments ensure flawless measurement accuracy for your critical samples.

The CertBuy 50 Pack 50ml Plastic Centrifuge Tubes feature durable polypropylene construction, graduated volume markings for precise measurement, and secure blue HDPE screw caps. Their self-standing conical design supports stable sample handling, while the tubes withstand low-temperature freezing, making them ideal for scientific, industrial, and laboratory applications.

Specifications

ASIN	B07RS8VL7R
Best Sellers Rank	#14,476 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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R1573

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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