Reduced Antimony Trioxide (ATO) Flame Retardant Solutions

Reduced Antimony Trioxide (ATO) Flame Retardant Solutions

Reduced Antimony Trioxide (ATO) Flame Retardant Solutions – for healthier and more environment friendly products

Antimony Trioxide Regulatory Status:

  • A carcinogen is a substance that may cause cancer or increase its incidence by inhalation, ingestion, or skin absorption.
  • Antimony Trioxide (ATO) is classified as Carcinogenic Cat 2 via inhalation route according to GHS and CLP rules.
  • NTP interpretation of the results of animal toxicity studies could impose additional hazard classifications: lung toxicity and reproductive toxicity.
  • Antimony trioxide is currently evaluated by ECHA due to its potential genotoxicity.
  • Additional tox studies are requested by ECHA.
  • Result: more stringent classification would be applicable.

Future Regulation:

Future regulation may change ATO classification and will follow by restrictions and bans:


  • Carc. category 2, inhalation route only (Sb 3+ powders only)
  • STOT RE category 2 (lung toxicity)
  • NO reproductive toxicity classification


  • Carc. category 1B, all exposure routes (all physical forms)
  • STOT RE category 1
  • Repr. category 2

Occupational exposure limits might get more restricted:

Current: 0.5 mg inhalable Sb/m3
Possible: 0.1 mg respirable Sb/m3 ,0.006 mg respirable Sb/m

Kafrit solutions – Reduced/Free ATO

  • Reducing the Amount of ATO will decrease possible health issues.
  • New products with reduced amount of ATO or without ATO at all are now available.
  • Suitable for different polymers: ABS, PP & PE.
  • Design for future change in the regulations.

ABS Boards


PE Applications (Films, Pipes, Multiwalls, Foams, Solid Sheets)


PP Pipes


PP Foams



For more information:
Doron Sorek, Development and Product Engineering – Flame Retardant
TEL: +972-8-6809-308 ● Mobile: +972-50-6676-865 ● E-MAIL: