Ceramic Toxic Materials

Use of this page and the Glaze Pages are subject to the Terms of Use and Disclaimer.

Due to the need for a comprehensive listing of toxic ceramic materials on the Net, I have put together information on this subject. Below you will find a listing of 35 common and not so common ceramic ingredients -- the stuff that we deal with on a daily basis. While most of this knowledge is freely available, my experience at various art schools has told me that the toxicity of ceramic materials is not stressed enough. Even well known figures in the ceramic world have been known to disregard common sense rules. One well-known tragic incident was Hans Copers death from manganese poisoning. The instances of emphesemia due to dust inhalation amongst potters is too high -- a sickness which is fairly easily avoided. I hope this list will contribute to the knowledge available on ceramic toxins on the Net.

Many substances are a problem for the potter during production, e.g. through touch or inhalation, others in the finished product. A designates a substance which may be hazardous to health, either through inhalation or assimilation through the skin. Some substances should not be used for tableware, usually due to leaching. While the substaces listed may be hazardous, this does not mean they cannot be used at all - rather that caution should be used! Note that some ingredients listed may not be designated as toxic, but may be hazardous nonetheless. To make a contribution to this database, please send an email .

Safety Measures:  know the materials you are dealing with wear a good dust mask when handling dry materials wear gloves when touching any raw materilas, dry or wet avoid using particularly toxic raw materials, such as white lead. Use frits instead. wash hands carefully after contact with materials wear protective clothing and wash frequently wear a gas mask when reducing or salt or soda firing  wash workbenches and wet mop studio floors if spraying glazes, wear a mask and use a spray booth never eat or drink near studio or working area

Alumina	dust is a nuisance to lungs
Asbestos	causes particularly nasty fibrosis if inhaled.
Barium Carbonate	is a dangerous form of barium, as it forms a soluble chloride in the stomach and accumulates. It affects muscles, in particular the heart, increasing its excitability, leading to high blood pressure and internal bleeding. Will penetrate the skin. Not recommended for food ware, as it may leach.
Borax	chronic exposure can cause asthma, diarrhoea and skin conditions
Cadmium	Used as a pigment in glazes. Can cause respiratory diseases, osteoporosis, cancer and other problems. See Feature Article for more information.
Carbon Dioxide	If the oxygen level falls, hearing will decrease, pulse and blood pressure rise. Carbon dioxide forms during combustion firing processes.
Carbon Monoxide	combines in the body with the haemoglobin in the blood and reduces the availability of oxygen to the body. Symptoms such as headache, dizziness and fatigue appear in healthy people when 10% of their haemoglobin combines with carbon monoxide.
Chromates and Chromic Acid	may be cancerous. Will also enter the body through the skin.  See Feature Article for mor information.
Cobalt Oxide, Carbonate	can cause liver damage and dermatitis. Will enter the body through the skin.
Copper	salts are irritants to the skin, eyes,and mucous membranes. Inhalation of copper dust and fume results in irritation of the respiratory tract. See Feature Article for more information.
Dusts	in all forms in the studio should be avoided. They accumulate over the years and cause emphesemia -- not a nice disease to have. Take special care with silica.
Ferrous Sulphite	can be fatal and should be avoided.
Fiber Blanket	especially in the fired state can shed invisible floating fibres that have similar effects to asbestos.
Gases	from salt kilns and reducing kilns, can cause respiration trouble or even acid corrosion of lung tissue.
Gum Arabic	may cause asthma and eye inflammations.
Iron Chromate	may lead to acute pneumonia and cause lung cancer.
Iron Oxide Dust	is poisonous for children and can cause "iron pigmentation" of the lungs, supposedly benign but contentious.
Kaolin	similar to silica.
Lithium	very toxic. Not recommended for tableware.
Lead	is an accumulative poison. It can be stored in the bone structure for years before a fatal dose is accumulated. Beware of raw lead froms, such as white or yello lead, which are extremely toxic. Use lead frits instead. Do not use for tableware.
Liquid Petroleum Gas	can cause headaches, numbness, chills and vomiting, but is a greater risk as explosive than inhalation.
Magnesium Oxide	is considered inoxious, but general rules for dusts still apply.
Manganese	can lead to brain damage and eventually death. Will penetrate skin. See Feature Article for mor information.
Mica, Muscovite, Vermiculite, Lipidolite	may contain traces of asbestos. Inhalation of dust will lead to lung irritation, possibly cancer.
Nickel Oxide	can cause cancer. Will cause skin irritation ('nickel itch'). Will penetrate skin.
Platinum	may cause asthma.
Potassium Dichromate/ Bichromate	is very poisonous. Can cause kidney failure and is cancerous. Not recommended for tableware!
Selenium	affects the liver.
Silica	is everpresent in clay materials. Repeated inhalation will cause potentially fatal silicosis, or 'potters' asthma', a form of emphesemia. The molecule (especially when fired) has a 'hook' which attaches itself to the lung wall and accumulates and irritates.
Sulpher Dioxide	is a strong lung irritant and can form when firing soluble metal salts.
Talc	similar to silica
Tin Oxide	can result in 'stannosis', supposedly a benign condition.
Uranium Compounds	cause kidney damage, not to mention the radioactivity.
Vanadium Pentoxide	can cause Anemia; it a respiratory irritant. See Feature Article for more info

Disclaimer: this database is by no means a complete listing of toxic materials. It is a guide only. It remains the duty of each individual handling these and other substances to insure that the proper safety standards are met, and that he/she is fully informed on the levels of toxicity of the various substances he/she is using. For more information, refer to the relevant literature available.

The Glaze Page | More Articles