Safety Tubes with Bubble
Product Code : SCL-CL-11488
Safety Tubes with Bubble (SKU SCL-CL-11488) are 350 mm safety funnel tubes with a 40 mm upper opening and a bulb (the “bubble”) along the stem. Fitted through the stopper of a gas-generating flask, the tube lets acid be poured in while the liquid held in the bulb helps keep the gas from escaping back up. School and college chemistry labs, training institutes, distributors and tender buyers can source the tube through Science Lab Supplies in Ambala, India.
Specifications
The safety tube’s measurements are set out row by row in the table. In short, the tube is 350 mm long and opens at the top into a 40 mm funnel for pouring, and its stem carries one bulb, which traps a little liquid to act as a seal while a gas is being generated in the flask below.
| Specification | Value |
|---|---|
| SKU | SCL-CL-11488 |
| Type | Safety tube with bulb (bubble) |
| Bulbs | 1 |
| Upper diameter | 40 mm |
| Length | 350 mm |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for Safety Tubes with Bubble
The safety tube can serve as the acid inlet of a simple gas generator. With its stem dipping below the liquid in the flask, acid added through the funnel reaches the solid, while gas leaves by a separate delivery tube instead of escaping through the funnel. The bulb gives extra protection against liquid being forced back.
- Class 10 science: preparing hydrogen from zinc granules and dilute acid.
- Class 10–11 chemistry: preparing carbon dioxide from marble chips and dilute hydrochloric acid.
- Class 11–12: gas preparation with collection over water or by displacement of air, as in the Apparatus for Cooking Chlorine, Hydrogen Chloride, whose set includes a safety tube.
- College and teacher-training labs: comparing the bulb safety tube with a long-stemmed Thistle Funnel as the liquid inlet of a gas generator.
Acids are corrosive: add them slowly through the funnel, wear eye protection and keep flames away from hydrogen. Gas preparation should always be supervised.
Standard Scope of Supply
The Safety Tubes with Bubble are supplied as single tubes as described above. The flask, bored stopper, delivery tube and chemicals are not included; any of them can be added to the same quotation, so a complete gas generator can be priced in one document.
Packing, MOQ and Lead Time
Quotations cover anything from one safety tube to enough for every gas-preparation bench in a school. Each lists the packing, delivery time and price for your quantity, and the flasks and stoppers you need can be priced alongside by the same laboratory glassware supplier in India.
Science Lab Supplies holds an Importer-Exporter Code as a registered exporter, so it can ship to buyers in Tanzania, Uganda, the UAE, Saudi Arabia, Oman and the Philippines. Science Lab Supplies is registered for GST (GSTIN 06ADEPJ0574F2ZU). If you are equipping gas-preparation benches, put the tubes and flasks in the enquiry cart or describe the set-up on the contact page; tender quotations follow the lab tender page.
Frequently Asked Questions
What is the bulb on the safety tube for?
It holds a small amount of liquid that acts as a seal, so gas cannot easily escape up the tube and liquid is less likely to be pushed out of the funnel.
How is the tube fitted to a flask?
Pass it through one hole of a two-hole rubber stopper so that the stem ends below the liquid level in the flask; the second hole takes the gas delivery tube.
Who supplies the Safety Tubes with Bubble?
Enquiries for these tubes are answered by Science Lab Supplies in Ambala, India, which prices single tubes and tender quantities for schools, colleges, training institutes and distributors.
What are the dimensions?
The tube is 350 mm long with a 40 mm upper diameter and one bulb on the stem. Other parts of the gas generator are chosen to suit these dimensions.
Related Gas-Preparation Apparatus
A safety tube is one part of a gas generator. A bored stopper holds it in a flask, tubing and a delivery set carry the gas away, a drying tube can remove moisture, and a Kipp’s apparatus is a complete alternative generator. These Chemistry Lab items can be quoted with it.
- Rubber Stoppers of Various Diameters with Holes — round, chemical-resistant bored stoppers, 11 to 15 mm at the base.
- Flat-Bottomed Flasks 250ml — 250 ml flat-bottomed glass flask with a long mouth.
- Simple Equipment for Gases that do not Dissolve in Water — 18 x 150 mm test tube with a Z-shaped 6 mm glass tube and bored stopper.
- Kipps Apparatus — two-part glass generator for gases such as carbon dioxide and hydrogen from an acid and a solid.
- Glass Tubes of Different Diameters — 100 mm glass tubes from 5–6 mm up to 12–13 mm diameter.
- Rubber Tube (Laboratory) — rubber hose of 6 mm inner diameter, usable from −25 °C to +70 °C.
- Dryer Pipes — clear glass drying tube, 17 mm in diameter and 145 mm long.
Browse the full Chemistry Lab range, the Lab Glassware range, or all school lab equipment.
Last updated: 9 October 2026
