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

268.44 DT

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Description

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

READY TO STAND OUT - Self-standing conical design offers stability and easy handling in any lab or workspace.
BULK PACK ADVANTAGE - 50-pack supply keeps your workflow uninterrupted and your samples organized.
LEAK PROOF CONFIDENCE - Snap-on blue HDPE screw caps provide a secure, spill-resistant seal for worry-free storage.
PRECISION AT A GLANCE - Graduated markings in fine 2.5ml increments ensure exact sample measurement every time.
BUILT FOR THE LONG HAUL - Durable polypropylene construction resists cracking and endures long-term freezing.

The CertBuy 50 Pack 50ml Plastic Centrifuge Tubes combine durable polypropylene construction with precise graduated markings and secure screw caps. Designed for reliable sample storage and handling, these self-standing conical tubes resist low temperatures and leaks, making them ideal for professional labs and scientific workflows.

Specifications

ASIN	B07RS8VL7R
Best Sellers Rank	#19,804 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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268.44 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

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TrustScore 4.5 | 7,300+ reviews

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