Laboratory Glass Stopcocks Manufacturer, Suppliers and Exporter in Ambala India

Laboratory Glassware Ambala is leading Laboratory Glass Stopcocks Manufacturer,and supplier and Exporter in Amabla India, Algeria (Algiers), Angola (Luanda), Argentina (Buenos Aires), Armenia (Yerevan), Australia(Canberra), Austria (Vienna), Bahrain (Manama), Bangladesh (Dhaka), Bhutan (Thimphu), Bolivia (Sucre), Botswana (Gaborone), Brazil (Brasília), Brunei (Bandar Seri Begawan), Montenegro (Podgorica), Morocco (Rabat), Mozambique (Maputo), Myanmar (Naypyidaw), Namibia (Windhoek), Nepal (Kathmandu), New Zealand (Wellington), Nigeria (Abuja), Oman (Muscat), Palestine (Ramallah), Panama (Panama City), Papua New Guinea (Port Moresby), Paraguay (Asunción), Peru (Lima), Philippines (Manila)¸ Portugal (Lisbon), Qatar (Doha), Rwanda (Kigali), Saudi Arabia (Riyadh), Senegal (Dakar), Serbia (Belgrade), Sierra Leone (Freetown), Slovakia (Bratislava), South Africa (Cape Town) (Pretoria) (Bloemfontein), South Sudan (Juba), Spain (Madrid), Sri Lanka (Sri Jayawardenepura Kotte) (Colombo), Sudan (Khartoum), Syria (Damascus), Tanzania (Dodoma), Thailand (Bangkok), Togo (Lomé), Tonga (Nuku'alofa), Trinidad and Tobago (Port of Spain), Tunisia (Tunis), Turkey (Ankara), Turkmenistan (Ashgabat), Uganda (Kampala), United Arab Emirates (Abu Dhabi), United Kingdom (London), United States (Washington, D.C.)

A laboratory glass stopcock is the valve that starts, stops and regulates flow through a piece of glass apparatus, using a rotating key seated in a ground glass barrel. Laboratory Glassware Ambala manufactures and exports stopcocks in three patterns — ground glass key, PTFE key and PTFE needle valve — in both burette-specific and straight forms, listed below with product codes. They are bought by school, college and university laboratories, research and industrial laboratories, government institutions, NGOs, distributors, importers, project consultants and educational procurement agencies, and most often as replacements for a fitting on an existing burette or apparatus. Because the key type and the bore determine whether a stopcock is usable, this page sets out what to confirm in writing before an order is placed.

Stopcocks listed in this category

Key type	Products and codes	Size as published on the record
Ground glass key	Glass Key Stopcock For Burette (EL-GS-10262); Glass Straight Stopcock (EL-GS-10264)	Bore size 0-3 on 10262; nothing published on 10264
PTFE key	PTFE Key Stopcock Burette (EL-GS-10265); Straight PTFE Key Stopcock (EL-GS-10267)	Size 12.5 on 10265; nothing published on 10267
PTFE needle valve	PTFE Needle Valve Stopcock (EL-GS-10268); PTFE Needle Valve Stopcock, Automatic Burette (EL-GS-10270); PTFE Needle Valve Stopcock For Burette (EL-GS-10271); PTFE Needle Valve Stopcock Straight (EL-GS-10273)	Bore size 0-3 and 0-6 on 10268; bore size 0-3 on 10270 and 10271; nothing published on 10273

The figures above are reproduced exactly as they appear on the product records. They are published without a unit of measurement, so the unit and the measuring convention should be confirmed before any of them is used in a specification.

Glass key, PTFE key and needle valve

These are the ordinary meanings of the three patterns, given so that a buyer can specify correctly. What is supplied against any line should still be confirmed with the company.

A ground glass key is a tapered glass plug seated in a matching ground barrel. It is turned by hand and normally requires a film of stopcock grease to seal and to move freely, which means the grease has to be compatible with whatever passes through the valve and has to be renewed. A PTFE key is a moulded plastic plug used without grease, usually retained by a nut, and it avoids both the greasing routine and the risk of a glass key seizing in the barrel after standing; it is generally chosen where grease would contaminate the sample. A needle valve uses a tapered PTFE stem advanced into a seat rather than a rotating bore, which gives finer control over slow flow rates — the reason it is common on burettes used for titration.

The three patterns are not interchangeable within one piece of apparatus. Establish which pattern the existing item was built for before ordering a replacement.

Matching a replacement stopcock to a burette

Four of the eight stopcocks in this category are named for burettes, and the burettes published on this website are themselves listed by the stopcock fitted to them — some with a glass stopcock, some with a PTFE key stopcock, some with a PTFE needle valve stopcock, and two lines described as having a detachable stopcock. A replacement should therefore be matched on the same basis: identify the pattern fitted to the burette in use, then order the stopcock of that pattern.

Two things need to be settled in writing before an order, because neither is published. The first is the bore or size in millimetres, on both the burette and the stopcock, since the figures on the stopcock records carry no unit and the burette records carry no size at all. The second is whether the stopcock on a given burette is detachable — a stopcock can only be replaced on a burette designed for it, and only two burette lines are described that way.

Where a laboratory holds burettes from more than one source, quote the burette make and model alongside the required pattern and bore, and ask for written confirmation against each line rather than ordering by product name.

Which specifications should be confirmed before ordering?

Selection criterion	What to confirm for each line
Key pattern	Ground glass key, PTFE key or PTFE needle valve
Bore	The bore in millimetres, and whether the published figure is a diameter, a range or a size designation
Barrel size	The ground barrel dimensions, and the taper designation where one applies
Arm dimensions	The outside diameter and length of the side arms, and whether they are plain, hose-ended or joint-ended
Which burette or apparatus it fits	The specific items the stopcock is made for, confirmed against what the laboratory already holds
Retention	How a PTFE key is retained — nut, clip or otherwise — and whether the retaining parts are supplied
Glass type	The glass grade of the barrel, which is not stated on any record in this category
Grease	For glass keys, whether stopcock grease is required, supplied, or recommended by type
Chemical compatibility	The reagents the key and barrel will be exposed to, checked against the key material
Temperature and vacuum	Any temperature limit and whether the stopcock is rated for use under vacuum
Spares	Whether replacement keys, seats and retaining nuts can be ordered separately from the complete stopcock
Packing	Quantity per pack and per carton, and the export packing used for glass items

Applications and buyer groups

Stopcocks in this category are used to control delivery from burettes during titration, to isolate or regulate flow in distillation, extraction and gas-handling assemblies, and as replacement parts when a fitted stopcock is broken, seized or chemically attacked. They are bought by school and college practical laboratories, university teaching and research laboratories, industrial and quality-control laboratories, glassware repair workshops, and institutional laboratory fit-outs. Replacement orders are usually specified against an existing item, so the pattern and bore should be identified before the enquiry is sent.

Institutional and export enquiries

Laboratory Glassware Ambala accepts bulk laboratory-supply and tender enquiries through its contact and tender pages, and a schedule may combine stopcocks with burettes or other laboratory glassware. Institutional procurement support does not imply approval, accreditation or endorsement by any ministry, government authority, development bank, United Nations agency or funding organization.

Frequently asked questions

What do the bore size figures on these products mean?

They are published without a unit of measurement, so the unit and whether the figure is a diameter, a range or a designation should be confirmed in writing before the figure is used in a specification.

Should I choose a glass key or a PTFE key?

That depends on whether stopcock grease is acceptable in the application and what will pass through the valve; confirm the key material against the reagents in use, and confirm what pattern the existing apparatus was built for.

Can these stopcocks be fitted to burettes bought elsewhere?

Ask before ordering. Give the burette make, model and bore, and request written confirmation against the line rather than ordering by product name.

Are replacement keys available separately from the complete stopcock?

Confirm this per line; the product records do not state whether keys, seats or retaining nuts can be ordered on their own.

Request specifications or a quotation

Send your key pattern, bore and quantities — and the burette or apparatus the stopcocks are for — to request current product information, catalogue details and an itemised quotation.

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