The canisters used are very carefully chosen to suit the gases they will contain. The materials used, surface finish, internal preparation and special internal coatings, combine to ensure that our non-refillable cylinders support accurately certified and stable gas mixtures. These steps are vital, because even trace amounts of moisture or other impurities absorbed from the canister surface can seriously alter the composition of many gas mixtures. For non-refillables this is especially important as the ratio of internal surface area to gas content is very high.
Metallurgy is one of many key factors that affect mixture reliability in non-refillables. Air Products has exhaustively researched into the optimum materials for ensuring the long term stability of such gas mixtures in canisters, even those incorporating highly reactive components like hydrogen sulphide. Some metal alloys adversely affect mixture stability and reliability. Air Products technology leaders understand the science of metallurgy and its effect on gas mixture composition. We are confident our cylinder coating technology and methods are the best in the world.
All Air Products canisters comply fully with all appropriate European legislation. Our larger 34L, 58L, and 110L canisters comply with EN 12205, ISO11118 and are marked accordingly with the π mark.
Our smallest non-refillable canister is classed as an aerosol. 10L aerosol canisters supplied by Air Products are compliant with 75/324/EEC as referenced in ADR 2011, section 22.214.171.124.
The stainless steel 'C10' valves used on our 34L, 58L, and 110L canisters are designed to physically prevent the canisters from being refilled. A method of physically preventing the refill of canisters is an important part of legislative compliance. It is a requirement of EN 12205 that non-refillable canisters feature a non-refillable valve in accordance with EN 13340. The π mark on the canisters shows that they meet the provisions of the transportable pressure equipment directive (TPED).
Generally, calibration gas mixtures in non-refillables are manufactured gravimetrically in refillable cylinders, which involves the addition of gases by mass using highly accurate weigh scales that are traceable to international standards. We then use dedicated high integrity filling panels to decant these mixtures into the lightweight non-refillable canisters. All aspects of gas mixture production are coordinated at our fully integrated Speciality Gases manufacturing plant in the UK, and it means we have absolute control of mixture production from start to finish.
Each and every mixture type incorporating a reactive gas component undergoes analytical verification by statistical batch analysis. We do this many times between the initial fill and the dispatch date, because mixture stability and reliability is of paramount importance to our customers.
The range of mixtures and component types offered in non-refillables is varied. Many require specific treatment methods and we use our state-of-the-art filling equipment to allow us to achieve these. Subsequently we verify the stability of our canisters analytically over time. Only then can we prove that the mixtures are stable and can be released to our customers.
Our range of non-refillable products is comprehensive and covers all major gas detection applications.
Use the below product selector to explore and purchase a limited selection of our calibration gases, and complimentary equipment. The gases listed in our selector are the most popular ones and typically held in stock, these will therefore be available for immediate dispatchment by courier.Product Selector View All Products
"Our business relies on simple bump testing of gas detectorson board marine vessels. Complex high pressure cylinders and regulators would make the job too difficult but we find the Air Products non-refillable offerings very easy to use and the equipment is simple to operate."
"We are involved in the installation, commissioning and maintenance of a wide range of gas detection equipment into many market sectors. The fact that the Air Products’ range covers all of the flammable, toxic, quad-gas and corrosive gas requirements for this market is very important to us."
"Personal, portable and fixed gas detection equipment is widely used in many safety critical applications and these items are often subjected to relatively harsh environments and working conditions. The gas sensing element within this equipment is perhaps the most fragile and crucial component, and if this was to fail, it would render the equipment useless. The selection of appropriate test gas is important to ensure the bump test is carried out correctly and as an active member of CoGDEM, Air Products know about it. They have contributed to the CoGDEM Guide to Gas Detection, a new hardback reference book which explains best practice and aids the selection of suitable test gases and equipment."