Liquid Nitrogen is a compressed source of dry Nitrogen gas with the ability to hold temperatures far below the freezing point of water. It is easily transportable and very useful for a wide range of applications, in particular:
• Cryotherapy – a treatment that removes surface skin lesions such as warts by freezing them.
• Cryopreservation – to store and preserve cells, tissue and other biological samples for laboratory work.
• Culinary – for the preparation of frozen desserts and cocktails, and transportation of food products.
Nitrogenx provides a door-to-door delivery service for all your Liquid Nitrogenx requirements.
Dewar’s in various sizes are available for rent or purchase, these are specifically designed for the safe storage and use of Liquid Nitrogen. A range of accessories and spare parts are available. Our service department can service, fix and replace parts on all equipment supplied. Cryospray units are available for more specialised Liquid Nitrogen application such as Cryotherapy, these units come with 5 spray tips. Nitrogenx delivers throughout the wider Auckland area 2-3 times per week to ensure you never run out.
General Nitrogen Properties
Gaseous Nitrogen is colourless and tasteless and is slightly lighter than air at equal temperatures, cold Nitrogen vapour is, however, denser than atmospheric air. Liquid Nitrogen is odourless, colourless and boils at -195.80C. One volume of Liquid Nitrogen gives approximately 700 volumes of gas at ambient conditions. Its volume concentration in the atmosphere is 78%. Gaseous and Liquid Nitrogen are non-corrosive and are not flammable. Nitrogen is not toxic.
Certain steels, such as carbon steel, and some other materials are unsuitable for service at sub-zero temperatures because they lose impact strength and become extremely brittle. Materials normally suitable for service at low temperatures are stainless steels, aluminium and copper and their alloys.
In an area where Liquid Nitrogen spillage can occur care should be taken to ensure that it does not come into contact with vulnerable steel structures and vehicle tyres.
• Cold Burns:- Liquid Nitrogen and cold Nitrogen vapours can produce effects on the skin similar to a burn. Naked parts of the body coming into contact with uninsulated parts of equipment may also stick fast and the flesh may be torn on separation. Affected parts must be washed immediately with large quantities of tepid water. Summon medical help.
• Asphyxia:- Nitrogen, although non-toxic, can constitute an asphyxiation hazard through displacement of oxygen in the atmosphere. When liquid nitrogen evaporates, the gas produced is very cold and heavier than air. Thus it may accumulate in low lying areas such as pits and trenches and cause oxygen deficiency. Neither Nitrogen gas nor oxygen depletion are detectable by the normal human senses.
BREATHING A PURE NITROGEN ATMOSPHERE WILL PRODUCE IMMEDIATE LOSS OF CONSCIOUNESS AND ALMOST IMMEDIATE DEATH.
• Areas where equipment containing Nitrogen that is being stored or used should be well ventilated.
• Personnel should not enter enclosed areas which may be deficient of oxygen. Where doubt exists, the atmosphere should be checked with an oxygen analyser and a ‘Safety Work Permit System’ applied.
• When handling liquid Nitrogen or where exposure to very low temperatures can occur, wear gloves and appropriate eye protection. Safety shoes and body protection should also be worn.
• Persons showing symptoms of oxygen deficiency should be moved immediately to a normal atmosphere.
• Persons who are unconscious or not breathing must receive immediate artificial respiration.
• Medical assistance should be summoned without delay.
• The person should be kept warm and resting.
• It is important that personnel carrying out rescue operations must minimise the risk to themselves.
A RESCUER SHOULD NOT ATTEMPT TO ENTER AN OXYGEN DEFICIENT ATMOSPHERE WITHOUGHT THE USE OF A SUITABLE SELF CONTAINED BREATHING APPARATUS.
Liquid Nitrogen Spillage
In case of large spills, the vaporisation rate can be increased by the use of large quantities of water, and thus the period during which the vapour cloud is present will be reduced. However, this will also increase the volume of the vapour cloud which has to be taken into account if the place is close to public roads, buildings, etc.
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