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High transparency feature infographic of mini borosilicate glass test tubes, six tubes placed on white stepped display platforms with blue, orange, red colored liquid, text "HIGH TRANSPARENCY" explaining easy observation of gas & reaction changes, light grey background

Group bulk display of eight identical mini borosilicate glass test tubes filled with uniform blue liquid, staggered layered vertical arrangement, transparent tube bodies with smooth rounded bottoms, isolated white background

Macro measurement shot of miniature glass test tube clamped by metal tweezers above a stainless steel metric ruler, clear millimeter scale markings showing tube outer diameter size, pure white background size verification image

Vertical macro close-up of mini borosilicate glass test tube upper thickened wall, blue translucent safety shield with white check mark icon, highlighting reinforced tube rim and uniform thick wall, plain white background

Feature marketing graphic for borosilicate glass test tubes, two tilted glass tubes filled with red and blue liquid, text "MADE OF BOROSILICATE GLASS" introducing high temp resistance & chemical stability, light grey water ripple background

Two transparent mini round-bottom borosilicate glass test tubes placed vertically side by side, left filled with light blue liquid, right filled with golden yellow liquid, smooth fire-polished rims, pure white isolated background

7mm outer diameter 50mm height wide bore micro glass test tube containing blue reagent liquid, annotated dimension marks Ø7mm and 50mm, green bottom banner "7*50mm / 200pcs", white background lab glassware product render

7mm diameter 50mm long wide bore small borosilicate glass test tube with blue liquid, vertical dimension annotations Ø7mm & 50mm, green footer text "7*50mm / 100pcs", isolated white background lab micro sample tube

7mm OD 30mm height wide bore micro glass test tube filled with blue aqueous liquid, annotated dimension marks Ø7mm and 30mm, green bottom label "7*30mm / 200pcs", pure white background lab glassware render

7mm diameter 30mm length wide miniature borosilicate glass test tube with blue liquid, dimension annotations Ø7mm and 30mm, green bottom text "7*30mm / 100pcs", isolated white background micro lab tube

6mm outer diameter 50mm height micro glass test tube containing blue reagent liquid, annotated dimension marks Ø6mm and 50mm, green bottom banner "6*50mm / 200pcs", white background lab glassware render

6mm diameter 50mm long small borosilicate glass test tube filled with blue liquid, vertical dimension annotations Ø6mm & 50mm, green footer text "6*50mm / 100pcs", isolated white background lab micro sample tube

6mm OD 30mm height micro glass test tube with blue test liquid, annotated dimension marks Ø6mm and 30mm, green bottom label "6*30mm / 200pcs", pure white background small lab glassware product render

6mm diameter × 30mm length mini borosilicate glass test tube filled with blue liquid, linear dimension markings Ø6mm & 30mm, green bottom banner text "6*30mm / 100pcs", isolated white background, micro lab sample glassware

Features & Details

🔬 6×30MM MICRO DIMENSION	Standard 6mm diameter × 30mm length inverted tubes fit inside culture test tubes cleanly.
🧪 BORO 3.3 GLASS	Autoclavable borosilicate glass resists clouding, chemical etching, and thermal autoclave sterilization.
🦠 GAS BUBBLE DETECTION	Inverted orientation captures micro gas bubbles produced during coliform bacterial fermentation assays.
📦 100/200 PCS BULK PACK	Supplied in convenient high-count laboratory boxes for high-throughput microbiology laboratories.

About this item

Product specification

Attribute

Product Specifications

Material & Properties

Raw Material

Premium High Borosilicate Glass

Optical Clarity

High Transmittance (No water streaks or bubbles)

Design Feature

Smooth Round Bottom (Optimized for trapping gas)

Autoclavable

Yes (Thermal shock resistant for 121°C/134°C sterilization)

Available Dimensions & Packaging

6mm Diameter Series

6mm × 30mm: Available in 100 PCS or 200 PCS packs

6mm × 50mm: Available in 100 PCS or 200 PCS packs

7mm Diameter Series

7mm × 30mm: Available in 100 PCS or 200 PCS packs

7mm × 50mm: Available in 100 PCS or 200 PCS packs

Laboratory Synthesis, Distillation & Volumetric Containment

Durham Tubes, Borosilicate Glass Fermentation Tubes for Microbiology Professional Series

Ensuring dependable accuracy during daily operations requires professional equipment engineered to withstand demanding laboratory and industrial environments. The Xin Tester Durham Tubes, Borosilicate Glass Fermentation Tubes for Microbiology (100/200 PCS) provides verified stability, user-friendly operation, and certified safety compliance across standard maintenance protocols. Discover our complete line of diagnostic and testing instruments in the Lab Glassware catalog.

Uniform Heavy-Wall Blown Glass

Engineered with consistent wall thickness to resist vacuum pressure gradients and mechanical bench knocks during daily agitation.

Permanent Ceramic Markings

Fired white/blue ceramic graduations and matte labeling spots resist aggressive wash detergents, acid baths, and ultrasonic cleaning.

💡

Glassware Insight: Borosilicate 3.3 Thermal Expansion

With a thermal expansion coefficient of 3.3×10⁻⁶/K, Class A borosilicate glassware prevents thermal strain fractures when transitioning between boiling baths and cold washes.

Ordering & Model Verification

Verify capacity, joint sizing, and closure type in the product options before completing your order in the right-side buy box.

Related technical collections:
Lab Glassware |
Lab Consumables

Related products:
MFC borosilicate glass bioreactor vessel

Use Cases

Autoclavable & Sterile Cell Culture & Biology Micro-Volume Analysis School Science Labs

FAQs

What is the main purpose of using Xin Tester Durham Tubes?

They are primarily used in microbiology for gas production tests and sugar fermentation tests. When placed inverted in a larger tube of culture medium, they capture any gas produced by microorganisms as they metabolize sugars, which is a key indicator for identifying specific bacterial strains like E. coli.

Can these tubes be sterilized in an autoclave?

Yes. Made from high borosilicate glass with a low thermal expansion coefficient, these tubes are highly resistant to heat and can be sterilized in an autoclave at standard temperatures (121°C or 134°C) to ensure sterile experimental conditions.

Why is high transparency so important for these specific tubes?

During sugar fermentation tests, the amount of gas produced can sometimes be very small. The high transparency of the Xin Tester glass allows researchers to clearly see even tiny bubbles trapped at the top of the tube, ensuring accurate data collection.

How should I handle and clean these micro-sized tubes?

Due to their small size and glass material, they should be handled carefully to avoid breakage. After use, they should be cleaned thoroughly with laboratory-grade detergent, rinsed with distilled water, and sterilized before the next use to maintain aseptic conditions.

Xin Tester Durham Tubes, Borosilicate Glass Fermentation Tubes for Microbiology (100/200 PCS)

Price range: $16.10 through $31.82

Extra 5% Off with code: welcome5

SIZE

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.