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Chemical Name: Boron Zinc Hydroxide Oxide
Function: Flame Retardant, Smoke Suppressant
Chemical Family: Zinc & Zinc Compounds
Compatible Polymers & Resins: Polyvinyl Chloride (PVC), Polyethylenes (PE), Epoxies (EP), Polyamides, Unsaturated Polyester (UPE)
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TypeDocument Name
Technical Data Sheet
CHARMAX™ LS ZB400 Technical Data Sheet
CHARMAX™ LS ZB400 Technical Data Sheet
Technical Data Sheet

Knowde Enhanced TDS

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Identification & Functionality

Chemical Formula

4ZnO - 6B2O3 - 7H2O

CHARMAX™ LS ZB400 Features & Benefits

Applications & Uses

  • Charmax™ LS ZB400 is an effective flame retardant synergist and smoke suppressant in halogenated polymers, particularly PVC, acting in the condensed phase as a charformer. Charmax™ LS ZB400 can act as a partial replacement of Antimony Oxide and is also used in specific applications in polyethylene, epoxies, unsaturated polyesters and rubber. Typical uses include jacketing and insulation for plenum and riser cables, wall coverings, and urethane foams, fiber reinforced polyester composites, coatings & sealants.


Typical Properties
ValueUnitsTest Method / Conditions
325 Mesh Screen Retentionmax. 0.2%-
B₂O₃ Content47.0 - 49.0%-
Free Moisturemax. 0.9%-
H₂0 Content13.5 - 15.5%-
Particle Size, D504 - 6 μm-
ZnO Content37.7 - 38.9%-

Regulatory & Compliance

Certifications & Compliance

Safety & Health

Health and Safety
  • The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool dry, well ventilated area away from incompatible materials. For additional handling and toxicological information, consult the Polymer Additives Group Safety Data Sheet.

Packaging & Availability

Packaging Type
  • Standard packaging is in 25 kg poly and 500 kg bulk bags. Packages are on skids with stretch wrap. Special packages are available upon request.
Polymer Additives Group