Specifications
Specifications
Standard specifications for hollow rubber stoppers. Items marked Customizable are available upon request.
Request custom specs
| Size | Top × Bottom × H (mm) | Hole Dia. (mm) | Material Options |
|---|
| 1 | 19 × 14 × 26 | 5 | NR / VMQ / NBR / FKM |
| 2 | 21 × 15 × 26 | 5 | NR / VMQ / NBR / FKM |
| 3 | 23 × 17 × 26 | 5 | NR / VMQ / NBR / FKM |
| 4 | 26 × 19 × 26 | 5 | NR / VMQ / NBR / FKM |
| 5 | 29 × 22 × 26 | 5 | NR / VMQ / NBR / FKM |
| 6 | 33 × 25 × 28 | 5 | NR / VMQ / NBR / FKM |
| 7 | 38 × 29 × 30 | 5 | NR / VMQ / NBR / FKM |
| 8 | 42 × 33 × 30 | 5 | NR / VMQ / NBR / FKM |
| 9 | 46 × 38 × 30 | 5 | NR / VMQ / NBR / FKM |
Dimensions are typical values and may vary slightly between batches. Hole diameter can be customized (3~12mm).
📌 Customization Options:
• Material options (NR / VMQ / NBR / FKM / other)
• Hole diameter customization (3~12mm)
• Custom sizes or non-standard dimensions upon request
• Hardness range available
Product Description
I. Overview
The hollow rubber stopper is a specialized sealing accessory for distillation, gas transfer, and thermometer mounting in laboratories. Featuring a 5mm center through-hole, it allows glass tubing, thermometers, or conduits to pass through the bottle opening while maintaining an effective seal.
Available in sizes 1~9 to fit various glassware openings. Natural rubber (NR) is the standard option, with silicone rubber (VMQ) for extreme temperatures, nitrile rubber (NBR) for oil resistance, and fluororubber (FKM) for harsh chemical environments.
🔬 Product Advantages:
Center Through-Hole — Allows glass tubing, thermometers to pass through
Multiple Sizes — Sizes 1~9 for various glassware
Multi-Material — NR/VMQ/NBR/FKM for different environments
Reliable Sealing — Maintains seal while allowing passage
Ready to Use — Pre-drilled hole, no need for manual boring
II. Key Performance Parameters
- Material: NR / VMQ / NBR / FKM
- Through-Hole Diameter: 5mm (standard)
- Size Range: 1~9
- Temperature Range: -60°C ~ 250°C (varies by material)
- Applications: Distillation, gas transfer, thermometer mounting
III. Material & Manufacturing
Manufactured from high-quality natural rubber (NR) as the standard option, with VMQ, NBR, and FKM available upon request. Produced via precision compression molding for accurate dimensions, smooth surfaces, and precise hole positioning.
The through-hole is pre-drilled during manufacturing, eliminating the need for manual boring and ensuring a clean, precise opening.
