Adipic acid (CAS 124-04-9): storage and disposal

Most jars of adipic acid arrive as a plain white solid in a screw cap tub, and that is usually how they stay for years. It belongs on a dry, labelled shelf in the general stock area, dated on arrival, and kept apart from food grade supplies. The stated classification is for serious eye irritation, so escaped powder presents a dust exposure concern, particularly for the eyes. Because it sounds like a food acid, it sometimes ends up next to preserving or baking supplies in school prep rooms, and that is a mistake worth avoiding. Keep the adipic acid clearly labelled and segregate other nylon demonstration chemicals according to their individual hazards and compatibility requirements.

Few visible signs mark this substance as it ages, and that is itself the point to remember. A technician checking an old tub should look at the powder first. Free-flowing white crystals or powder are normal. Hard clumps, a damp patch at the base or a cap that will not turn show that moisture has reached the contents. Faded or missing labels are the common real problem, along with a lost date of receipt. A cracked tub or a split lid also counts. If the label cannot be read with certainty, the jar is treated as an unknown chemical and not used again.

By specialist collection only. It never goes down the drain or into general waste. It is normally packed in a non-regulated or low hazard laboratory pack with compatible chemicals.

Before asking for a collection, note the tub size, how much is left and whether the original label is intact. Adipic acid sits in the classified, hazardous waste group because of its eye irritation hazard, so it is not described as ordinary rubbish and must not be tipped into a sink or placed in a skip. A school or college store would normally give the discarded organic chemical code, since the stock is a lab chemical rather than a laboratory pack. The specialist carrier packs it with compatible solids.

Usually held as: solid.

Part-used bottles and full containers are both fine. Tell us the size and how many, and an estimate is enough for a first price.