24PK Test Tubes 50ml Borosilicate Glass - Durable Lab Tubes

In this review the focus is on the 24PK Test Tubes 50ml from EISCO, a set aimed at labs, classrooms and serious hobbyists who need reliable, heat-resistant glassware. The bottom line: these tubes stand out for their use of Borosilicate 3.3 glass and a uniform 1.2mm wall that together deliver genuine thermal shock resistance and chemical durability, making them a practical choice when repeated heating, autoclaving or direct flame exposure is expected. If dependable, stackable test tubes for organized storage or routine lab use are required, these are worth considering.

Key Features

• Borosilicate 3.3 glass: Provides superior chemical resistance for handling common reagents without leaching or rapid degradation.
• 1.2mm uniform wall: The thin but consistent wall thickness reduces thermal gradients for better resistance to cracking during rapid temperature changes.
• Beaded rim: Fire polished, chip- and crack-resistant rims improve durability and make handling or inserting stoppers smoother.
• Autoclavable construction: The material tolerates sterilization cycles so the tubes can be repeatedly sanitized for lab or classroom reuse.
• 50ml capacity, compact size: At roughly 5.9 in tall and 1 in diameter, these tubes fit standard racks and are convenient for storage, spice jars or craft supplies.
• Industrial quality pack: A 24-pack supplies multiple workstations or classroom groups without frequent reordering.

Who It's For

The set is best for professional laboratories, teaching labs and advanced hobbyists who require heat-tolerant, chemically resistant glassware for repeated use. The consistent wall thickness and beaded rims make them particularly suited to experiments involving heating, cooling, and autoclaving, as well as organized sample storage.

Those who need single-use plastic tubes, very large-volume containers, or tubes with preprinted graduations and caps may want to look elsewhere; this pack prioritizes durable glass construction and basic geometry over disposable convenience or specialized markings.

Pros & Cons

Pros

• Durable Borosilicate 3.3 construction gives reliable chemical and heat resistance for repeated lab use.
• Uniform 1.2mm walls and low temperature gradient reduce the risk of thermal shock and cracking during heating.
• Beaded, fire polished rims are chip resistant and improve longevity through repeated handling.
• A 24-piece pack is practical for classrooms, labs, or bulk storage needs.

Cons

• Glass test tubes require careful handling and are heavier than disposable plastic alternatives.
• No graduations or caps included, so measurement precision and sealing require separate accessories.

Specifications

Capacity	50ml (1.7oz)
Material	Borosilicate 3.3 glass
Wall thickness	1.2mm uniform
Rim	Fire polished beaded rim
Dimensions	5.9 in tall, 1 in diameter
Pack quantity	24 test tubes

Our Verdict

These 24PK 50ml test tubes deliver solid value for labs and classrooms that need reusable, heat- and chemical-resistant glassware. Their Borosilicate 3.3 construction, uniform 1.2mm walls and beaded rims make them dependable for heating and sterilization, and the 24-count format reduces refill frequency. They are a sensible purchase when durability and thermal performance matter more than disposable convenience or included caps.

Frequently Asked Questions

Are these tubes safe for direct flame?
Yes. The Borosilicate 3.3 glass and low temperature gradient make them resistant to direct flame and high temperatures used in typical lab procedures.

Can these be autoclaved?
Yes. The material and construction are autoclavable for routine sterilization.

Do the tubes include caps or graduations?
No. The pack contains bare test tubes without caps or printed volume graduations, so seals and measuring tools must be purchased separately.