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Solid Rubber Stopper
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Rubber · Stoppers & Seals

Solid Rubber Stopper

000#~22# Full Range · Top Dia. 12.5~160mm

Made from high-quality natural or synthetic rubber with excellent elasticity and sealing performance. Available in full range 000# to 22# to fit various glass apparatus including test tubes, flasks, and reagent bottles. NR, VMQ, NBR, FKM, EPDM materials available.

0 – 22Size
12.5 – 160 mmTop Dia.
8 – 145 mmBottom Dia.
17 – 60 mmHeight

Specifications are subject to confirmation with your enquiry.

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NR / VMQ / NBR / FKM / EPDM 000#~22# Full Range -60~250°C Chemical Resistant

📐 Features:
Full range 000#~22# · Multi-material options · Excellent elasticity · Reliable sealing · Chemical resistant

  • Material — NR / VMQ / NBR / FKM / EPDM
  • Range — 000#~22# (Top Dia. 12.5~160mm)
  • Application — Test tubes, flasks, reagent bottles
  • Temp Range — -60~250°C (varies by material)
We will follow up on your inquiry as soon as possible. Custom sizes supported Samples available
Specifications

Specifications

Standard specifications for solid rubber stoppers. Items marked Customizable are available upon request.

Request custom specs
SizeTop Dia. (mm)Bottom Dia. (mm)Height (mm)Material OptionsPackaging
000#12.5817NR / VMQ / NBR / FKM / EPDMBy weight
00#151120NR / VMQ / NBR / FKM / EPDMBy weight
0#171324NR / VMQ / NBR / FKM / EPDMBy weight
1#191426NR / VMQ / NBR / FKM / EPDMBy weight
2#211526NR / VMQ / NBR / FKM / EPDMBy weight
3#231726NR / VMQ / NBR / FKM / EPDMBy weight
4#261926NR / VMQ / NBR / FKM / EPDMBy weight
5#292226NR / VMQ / NBR / FKM / EPDMBy weight
6#332528NR / VMQ / NBR / FKM / EPDMBy piece
7#382930NR / VMQ / NBR / FKM / EPDMBy piece
8#423330NR / VMQ / NBR / FKM / EPDMBy piece
9#463830NR / VMQ / NBR / FKM / EPDMBy piece
10#524332NR / VMQ / NBR / FKM / EPDMBy piece
11#564634NR / VMQ / NBR / FKM / EPDMBy piece
12#625136NR / VMQ / NBR / FKM / EPDMBy piece
13#685538NR / VMQ / NBR / FKM / EPDMBy piece
14#756239NR / VMQ / NBR / FKM / EPDMBy piece
15#816840NR / VMQ / NBR / FKM / EPDMBy piece
16#877442NR / VMQ / NBR / FKM / EPDMBy piece
17#957845NR / VMQ / NBR / FKM / EPDMBy piece
18#1038348NR / VMQ / NBR / FKM / EPDMBy piece
19#1118852NR / VMQ / NBR / FKM / EPDMBy piece
20#1209355NR / VMQ / NBR / FKM / EPDMBy piece
21#14010060NR / VMQ / NBR / FKM / EPDMBy piece
22#16014560NR / VMQ / NBR / FKM / EPDMBy piece
Dimensions are typical values and may vary slightly between batches. Top/bottom diameter tolerance ±0.5mm, height tolerance ≤1mm.
📌 Customization Options:
• Material options (NR / VMQ / NBR / FKM / EPDM / other)
• Color options (white / red / blue / custom colors)
• Custom sizes or non-standard dimensions upon request
• Hardness range (30~80 Shore A)

Product Description

I. Overview

The solid rubber stopper (also known as a rubber bung) is a fundamental sealing consumable in laboratories, used for sealing test tubes, flasks, reagent bottles, and other glassware. Manufactured from high-quality natural or synthetic rubber with excellent elasticity and sealing performance.

Available in full range 000# to 22#, with top diameters from 12.5mm to 160mm to fit various glassware sizes. Natural rubber (NR) is the standard option, with silicone rubber (VMQ) for extreme temperatures, nitrile rubber (NBR) for oil resistance, fluororubber (FKM) for chemical resistance, and EPDM for weathering resistance.

🔬 Product Advantages:
Full Range — 000#~22# covers all common laboratory sizes
Multiple Materials — NR/VMQ/NBR/FKM/EPDM for various chemical environments
Excellent Elasticity — Ensures reliable sealing performance
Chemical Resistant — Compatible with a wide range of reagents
Cost-Effective — NR material offers economical daily use

II. Key Performance Parameters

  • Material: NR / VMQ / NBR / FKM / EPDM
  • Size Range: 000#~22# (Top Dia. 12.5~160mm)
  • Temperature Range: -60°C ~ 250°C (varies by material)
  • Application: Sealing test tubes, flasks, reagent bottles
  • Packaging: 000#~5# by weight (20kg/case), 6#~22# by piece

III. Material & Manufacturing

Manufactured from high-quality natural rubber (NR) as the standard option, with VMQ, NBR, FKM, and EPDM available upon request. Produced via precision compression molding for accurate dimensions, smooth surfaces, and no bubbles or burrs.

Each batch undergoes strict dimensional inspection and visual quality control to ensure consistent, reliable product quality.

Applications

Typical Applications

Chemistry Labs

Sealing test tubes, flasks, reagent bottles

Microbiology

Flask and tube closures to prevent contamination

Teaching Labs

Basic sealing for student experiments

Industrial

Sample container sealing, equipment port closures

Applicable Fields

  • Chemistry Laboratories
  • Biology Laboratories
  • Teaching Laboratories
  • Pharmaceutical & Food Industry
  • Industrial Testing

Selection Guide

I. Select by Material

MaterialPropertiesApplications
Natural Rubber (NR)Excellent elasticity, economicalGeneral sealing, teaching labs
Silicone (VMQ)-60~250°C, non-toxicFood/medical, extreme temperatures
Nitrile (NBR)Oil and chemical resistantOrganic solvents, oil media
Fluororubber (FKM)Acid/base resistant, high tempHarsh chemical environments
EPDMWeathering resistant, durableOutdoor, long-term use

II. Select by Size

  • 000#~5#: Small openings — test tubes, small bottles
  • 6#~12#: Medium openings — Erlenmeyer flasks, reagent bottles
  • 13#~22#: Large openings — large flasks, filtering flasks

💡 Selection Tips: General labs choose Natural Rubber (NR) for cost-effectiveness.
High temperature/Food grade choose Silicone (VMQ).
Organic solvents choose Nitrile (NBR).
Strong acids/bases choose Fluororubber (FKM).
Best fit: stopper should protrude about 1/3~1/2 after insertion.

Operation & Maintenance

User Guide

03

I. Preparation

  • Select the correct stopper size based on the inner diameter of the opening
  • Inspect the stopper for any visible damage or deformation
  • Autoclave if sterile conditions are required (check material temperature limits)
04

II. Installation

  1. Insert the smaller end of the stopper into the opening
  2. Apply even pressure with your palm to push the stopper in
  3. Ensure the stopper fits snugly without wobbling
  4. Use a stopper remover for extraction if needed

💡 Tips from Experienced Technicians: "Choose the right size" — The stopper should protrude about 1/3~1/2 for secure sealing.
"Avoid forcing" — Do not force an ill-fitting stopper to prevent glassware damage.
"Check material limits" — Verify temperature range before autoclaving.
"Replace regularly" — Inspect and replace every 6~12 months as rubber ages.

Care & Notes

Show care & notes

⚠️ Safety Notes

  • Wear lab coats and gloves during operation
  • Replace immediately if hardening, cracking, or deformation is observed
Do not
  • Avoid contact with strong oxidizers (accelerates aging)

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