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.

Certbuy 50ml Plastic Centrifuge Tubes With Screw Cap Cbtone 50

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

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409.11 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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Description

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

LEAK PROOF SCREW CAP - Blue HDPE snap caps provide a secure, no-spill seal—perfect for on-the-go professionals.
BULK PACK CONVENIENCE - 50-pack supply meets high-demand lab or fieldwork needs, ensuring you never run out mid-project.
SELF STANDING STABILITY - Conical base design keeps tubes upright, optimizing workspace efficiency and reducing contamination risk.
PRECISION VOLUME CONTROL - Graduated markings in 2.5ml & 5ml increments ensure exact measurements for flawless sample handling.
DURABLE POLYPROPYLENE BUILD - Robust PP material withstands low temperatures and long-term freezing without cracking or warping.

The CertBuy 50ml Plastic Centrifuge Tubes come in a 50-pack of durable polypropylene conical tubes featuring graduated volume marks every 2.5ml and 5ml. Designed with a self-standing base and leak-proof blue screw caps, these tubes support low-temperature freezing and secure sample storage, making them ideal for professional lab, industrial, or field applications.

Specifications

ASIN	B07RS8VL7R
ASIN	B07RS8VL7R
Batteries Included?	No
Batteries Required?	No
Customer Reviews	4.6 4.6 out of 5 stars (158)
Customer reviews	4.6 4.6 out of 5 stars (158)
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

Reviews

B**T

Wastewater Sampling Good

Perfect for wastewater sampling ! No leak, stay up, fit on rack. 10/10

5.09.2025

A**O

Todo bien

Fueron lo que pidió mi hermano y todo bien para viales de citología

28.06.2023

C**.

Well built

Outstanding little bottle. We use them for small machine screws and things like that. They hold up well.

13.10.2025

C**N

Works at work

We use these weekly for collecting samples and testing. Work well and hold up for what we need them for. We plan to purchase again when time to reorder.

13.03.2026

A**R

Great way to store coffee beans

Great cost effective way to store coffee beans. I have used the for a few months now without any negative issues. Stores between 15-18g of beans depending on the bean. I have airtight canister and fill it with pre measured doses so I can just grind and make without lots of measuring.

4.09.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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409.11 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.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews

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

Description

Specifications

Reviews

Common Questions