Ammonium Persulfate: Etchant for copper-plated PC Boards

GUIDE: Ammonium Persulfate: Etchant for copper-plated PC Boards

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(ammonium peroxydisulfate; peroxydisulfuric acid, diammonium salt)


  • Colorless to light straw crystals or powder. Odorless.
  • Strong oxidizer.
  • Hazard classes: 5.1 oxidizer; 6.3 acute health hazard.
  • CAS No.: 7727-54-0
  • UN-NA No.: 1444

NFPA 704 Placarding Information:

  • Health – 2
  • Flammability – 0
  • Reactivity – 1
  • Special Notice – OX


  • Oxidizer and bleaching agent.
  • Used in photography; electroplating; preserving food; depolorizing batteries; and washing infected yeast.
  • Etchant for printed circuit boards and copper.
  • In the manufacture of other persulfates, deodorizing and bleaching oils, and aniline dyes.

Reactivity and Fire Risk:

  • Normally stable when pure and dry.
  • Hazardous polymerization cannot occur.
  • Incompatible with: sodium peroxide; iron; solutions of ammonia and silver salts; powdered aluminum and water; zinc and ammonia; sodium oxide; and hydrogen.
  • Explosion hazard when mixed with finely powdered organic material, metal powder, or reducing agents.
  • Non-combustible. It is a strong oxidizer capable of igniting combustible materials.
  • Heating or contact with water releases oxygen and may intensify existing fire.

Health Hazards:

  • Causes irritation or burns to eyes, skin, and respiratory tract.
  • Possible allergic reaction with tearing, difficulty breathing and life-threatening shock.

Personal Protective Equipment:

  • Normal conditions: Wear chemical safety glasses or goggles and any other protective clothing to prevent any possibility of exposure to skin.
  • Fire conditions: Wear full protective clothing with full-faced, positive pressure SCBA.

Inspection and Storage Tips:

  • Store in cool, dry area away from sources or heat or moisture.
  • Must be stored away from incompatible materials as well as strong reducing agents and combustible materials.
  • Avoid storage on wooden floors.

Article 80 Storage Information:

Class 2 oxidizer.

S occupancy exempt amounts allowed per control area:

Unprotected by sprinklers or approved storage cabinets: 250 pounds

In sprinkled building, not within approved storage cabinets: 500 pounds

In un-sprinkled building, within approved storage cabinets: 500 pounds

In sprinkled building, within approved storage cabinets: 1000 pounds

For storage of quantities exceeding the allowed exempt amounts for an S occupancy, the storage facility must conform to H-7 occupancy requirements as outlined in the Uniform Building Code.

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