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Chemical collection and stock control for UK schools, universities and hospitals

Phenyl salicylate (CAS 118-55-8): storage and disposal

Phenyl salicylate, also called salol, is a white crystalline solid with a low melting point, kept in school, college and university stores. It causes skin and serious eye irritation and may cause respiratory irritation. The point that surprises people is how easily it softens: a jar in a warm cupboard can fuse into a single lump, and dust from a broken lump is what causes the respiratory problem.

CAS number
118-55-8
Form
Solid
Storage class
General
Signal word
Warning
Usual EWC code
16 05 06*
  • Harmful or irritant pictogramHarmful or irritant

What to do this week

  1. Check the label is readable and write down the opened date if it is not already there.
  2. Check it is stored as general stock and apart from the items listed under "Do not store with".
  3. If you no longer need it, add it to your disposal list so it goes on the next collection.

Safe storage in a school or lab

Begin with what it must be kept away from: heat. A cupboard above a radiator, beside a heating pipe or in a sunny window can be warm enough to soften the crystals, so keep the jar in a cool, dry, labelled, well organised store and date it on arrival. Because the dust irritates the airways, the lid goes on straight away after any opening, and the jar is handled at arm's length from faces. Keep it separate from food grade supplies. A jar that has fused should be left in one piece and not chipped at.

How to tell it has deteriorated

Crystals that were loose and now form a single block, or a jar with a glassy slab at the bottom and a smeared wall, have been through a warm spell. That is the main change to expect, and it is physical, not a sign that the contents are more dangerous. Look also for a faded label, a cap thread coated in powder, a cracked jar and a missing receipt date. Fine powder around the neck matters because of the respiratory irritation. A fused lump should be listed as it is, with a note on the record, not broken up.

How it must be disposed of

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.

Say what is wrong with the jar when you list it. A fused or smeared jar is declared as found, because trying to chip out a solid releases dust that irritates the airways. Phenyl salicylate goes by specialist collection, packed in a lab pack with compatible organic solids, under waste code 16 05 06* or 16 05 08* for a discarded organic chemical outside a pack. Give the jar weight, the label names, such as salol or phenol salicylate, and the condition of the lid. It does not go into a sink, a bin or a skip, and nobody should try to melt or wash it out.

Waste codes and transport details for Phenyl salicylate
EWC code, laboratory chemicals16 05 06*
Discarded organic chemical, not a laboratory pack16 05 08*
Hazardous wasteYes

The code depends on where the waste came from and what it is mixed with. Use the waste code finder to see why.

Common quantities we collect

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.

Where it is commonly held

Hazard statements

  • H315 Causes skin irritation.
  • H319 Causes serious eye irritation.
  • H335 May cause respiratory irritation.
Precautionary statements
  • P261 Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 Wash hands and exposed skin thoroughly after handling.
  • P264+P265 Wash hands and exposed skin thoroughly after handling. Do not touch eyes.
  • P271 Use only outdoors or in a well-ventilated area.
  • P280 Wear protective gloves, protective clothing, eye protection and face protection.
  • P302+P352 IF ON SKIN: Wash with plenty of water.
  • P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
  • P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319 Get medical help if you feel unwell.
  • P321 Specific treatment (see supplemental first aid instruction on this label).
  • P332+P317 If skin irritation occurs: Get medical help.
  • P337+P317 If eye irritation persists: Get medical help.
  • P362+P364 Take off contaminated clothing. And wash it before reuse.
  • P403+P233 Store in a well-ventilated place. Keep container tightly closed.
  • P405 Store locked up.
  • P501 Dispose of contents and container in accordance with local, regional, national and international regulations.

Substance as classified, dilutions may differ.

Questions

Our phenyl salicylate has melted into a block. Can we break it up?

No. Leave it in the jar. Chipping out a solid releases dust, and the dust may cause respiratory irritation. Keep the lid on, store it somewhere cool and declare it as fused when it is collected.

Is salol the same as phenyl salicylate?

Yes, salol is an old name for phenyl salicylate, and phenol salicylate is another. Record every name on the label together with any CAS number, so the waste description matches the jar.

Where should it be stored in a school prep room?

In a cool, dry, labelled store away from radiators and windows, and away from food grade supplies. It does not need the fire-resistant cabinet, but a warm shelf will soften the crystals.

Is phenyl salicylate hazardous waste?

Yes. It is described as hazardous waste because it is a skin, eye and respiratory irritant. It is collected by a registered carrier and packed in a lab pack with compatible solids.

Guidance only. Check your own risk assessment and your supplier's safety data sheet.

Hazard data source: PubChem GHS Classification, retrieved 31 Oct 2026. Formula C13H10O3. EC number 204-259-2.

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