Name: Test Tubes
Brand: RichTech

Specifications

Test Tubes · Specifications

Standard sizes below. Custom dimensions and special specifications available upon request.

Request custom specs

1. Plain Rim Test Tubes

O.D. × Length (mm)	Wall Thickness (mm)	Volume (mL)	Rim Type
10 × 75	1.0	4	Plain
10 × 100	1.0	6	Plain
12 × 75	1.0	6	Plain
12 × 100	1.0	9	Plain
13 × 100	1.2	10	Plain
15 × 100	1.2	14	Plain
15 × 150	1.2	22	Plain
16 × 100	1.2	16	Plain
16 × 150	1.2	25	Plain
18 × 150	1.5	30	Plain
18 × 180	1.5	36	Plain
20 × 150	1.5	38	Plain
20 × 200	1.5	50	Plain
25 × 150	1.8	55	Plain
25 × 200	1.8	75	Plain
30 × 200	2.0	110	Plain

2. Flared Rim Test Tubes (Rimmed)

O.D. × Length (mm)	Wall Thickness (mm)	Volume (mL)	Rim Type
10 × 75	1.0	4	Flared
10 × 100	1.0	6	Flared
12 × 75	1.0	6	Flared
12 × 100	1.0	9	Flared
13 × 100	1.2	10	Flared
15 × 100	1.2	14	Flared
15 × 150	1.2	22	Flared
16 × 100	1.2	16	Flared
16 × 150	1.2	25	Flared
18 × 150	1.5	30	Flared
18 × 180	1.5	36	Flared
20 × 150	1.5	38	Flared
20 × 200	1.5	50	Flared
25 × 150	1.8	55	Flared
25 × 200	1.8	75	Flared
30 × 200	2.0	110	Flared

3. Stoppered Test Tubes (Rubber/Cork Stoppers)

O.D. × Length (mm)	Wall Thickness (mm)	Volume (mL)	Stopper Size	Rim Type
13 × 100	1.0	8	00	Plain
15 × 150	1.2	18	0	Plain
16 × 120	1.2	16	00	Plain
16 × 150	1.2	20	0	Plain
18 × 150	1.5	25	1	Plain
18 × 180	1.5	30	1	Plain
20 × 150	1.5	35	2	Plain
20 × 200	1.5	45	2	Plain
25 × 150	1.8	55	4	Plain
25 × 200	1.8	75	4	Plain

4. Ground Glass Stopper Test Tubes

Capacity (mL)	O.D. × Length (mm)	Joint Size	Features
10	17 × 160	10/19	Interchangeable glass stopper
15	19 × 150	14/23	Standard ground joint
20	19 × 160	14/23	Standard ground joint
30	25 × 155	19/26	Standard ground joint
50	25 × 200	19/26	Standard ground joint
100	34 × 210	24/29	Standard ground joint

5. Stopper Size Guide

Rubber and cork stopper sizes with corresponding test tube O.D.:

Size	Top Dia. (mm)	Bottom Dia. (mm)	Height (mm)	Tube O.D. (mm)
00	22	16	22	13-14
0	25	19	25	15-16
1	28	22	28	18-19
2	32	25	30	20-21
3	36	28	33	22-23
4	40	32	36	24-25

* Cork stopper sizes generally correspond to rubber stopper sizes. Ground glass stoppers use standard taper sizes (e.g., 10/19, 14/23, 19/26).
* For specific stopper matching, please specify when ordering — we provide complete matching solutions.

* Custom dimensions and special specifications available. Contact us for details.
* Flared rim (rimmed) tubes are easier to hang and dry after washing.
* Stoppered tubes can be fitted with rubber, cork, or ground glass stoppers for different sealing needs.

Product Description

Test tubes are among the most basic and widely used glassware items in laboratories, suitable for small-scale reactions, heating, mixing, and temporary storage. Their simple and practical design makes them essential equipment in chemistry, biology, and medical teaching laboratories.

Three Series · Flexible Selection

RichTech offers test tubes in plain rim, flared rim (rimmed), and stoppered series:

1. Plain Rim Test Tubes

Features a smooth, flat rim suitable for sealing with rubber or cork stoppers.
Ideal for experiments requiring sealed storage or contamination prevention.

2. Flared Rim Test Tubes (Rimmed)

Features an outwardly flared rim that facilitates hanging storage and drip-drying.
Provides better grip for test tube clamps, reducing the risk of slipping.
Particularly useful for drying after washing.

3. Stoppered Test Tubes

Equipped with rubber stoppers, cork stoppers, or ground glass stoppers to prevent evaporation and contamination.
Rubber Stoppers: Flexible, strong sealing, drillable — suitable for inserting glass tubes, thermometers, or sensors.
Cork Stoppers: Natural material, economical — suitable for routine sealing, plant culture, and sample storage.
Ground Glass Stoppers: Precision fit, chemically resistant — suitable for volatile reagents, organic solvents, and high-demand sealing.
Secure shaking and mixing without leakage.

Material Advantage

Manufactured from Borosilicate Glass 3.3 in accordance with ISO 3585 standards. The ultra-low coefficient of thermal expansion (3.3×10⁻⁶/K) ensures resistance to thermal shock up to 280°C.

Design Features

Uniform wall thickness and rounded bottoms facilitate liquid pouring and cleaning. The rim is finely finished with smooth edges for safe handling. Stoppered tubes come with corresponding stoppers for excellent sealing performance.

Note: Always use a test tube clamp when heating — never hold test tubes directly by hand. Remove stoppers before heating stoppered test tubes to prevent pressure buildup. When heating liquids, point the tube opening away from yourself and others to prevent injury from splashing.

Applications

Common Configurations

Alcohol Burner + Test Tube Direct heating of small volumes
Test Tube Clamp + Test Tube Safe handling during heating
Test Tube Rack + Test Tube Organized storage and drying
Rubber/Cork Stopper + Plain Tube Sealed storage and reactions
Ground Glass Stopper + Stoppered Tube Volatile organic solvent storage, precision analysis
Rubber Stopper + Tube + Tubing Gas collection experiments

Specific Applications

Chemical Heating Reactions

Small-scale decomposition, synthesis, and reactions

Volatile Substance Testing

Stoppered tubes prevent evaporation for accurate results

Sealed Sample Storage

Protection from air contamination and oxidation

Shaking and Mixing

Secure mixing without leakage

Gas Collection

With tubing for collecting reaction gases

Anaerobic Experiments

Sealing to prevent oxygen interference

Biological Culture

Microbial and cell culture

Teaching Labs

Basic chemistry experiments in schools and universities

Clinical Testing

Preliminary testing of biological samples

Pharmaceutical QC

Quality testing of small batch samples

Tip: Flared rim (rimmed) tubes are easier to dry after washing and are ideal for repeated use. Stoppered tubes are better suited for long-term sealed storage. Choose the right stopper type based on your needs — rubber for flexibility and drilling, cork for economy, and ground glass for maximum sealing.

Test Tube Procedure

03

Heating

Use a test tube clamp to hold the tube approximately 1/3 from the top.
Preheat the tube before concentrating heat on the liquid portion.
When heating liquids, tilt the tube approximately 45° away from yourself and others.
Gently shake the tube during heating for even heat distribution.
When heating solids, tilt the tube slightly downward to prevent condensate from flowing back.
Remove stoppers before heating stoppered test tubes to prevent pressure buildup.

04

Sealing & Storage

Inspect tubes and stoppers for cracks or damage before use.
Apply a small amount of vacuum grease to rubber stoppers for enhanced sealing.
Clean ground glass stoppers promptly after use to prevent sticking.
Avoid keeping stoppers tightly inserted for extended periods to prevent adhesion.
Do not fill beyond 1/3 (for heating) or 1/2 (for storage) of the tube capacity.

05

Cleaning & Maintenance

Clean promptly after use to prevent residue from drying.
Use dilute acid or specialized cleaning agents for stubborn residues.
Rinse with distilled water and air-dry upside down on filter paper.
Store carefully to avoid chipping.

Tip: Flared rim (rimmed) tubes can be hung upside down on test tube racks after washing. Stoppered tubes requiring long-term storage should use ground glass stoppers with regular seal checks.

Care & Notes

Show care & notes

Safety Notes

When heating solids, tilt the tube slightly downward to prevent condensate backflow.
Remove stoppers before heating stoppered test tubes to prevent pressure buildup.
Inspect for cracks or scratches before use — damaged tubes may break when heated.

Do not

Always use a test tube clamp when heating — never hold by hand.
When heating liquids, do not point the tube opening toward yourself or others.
Do not place hot test tubes directly into cold water — thermal shock may cause breakage.