Name: Zinc Borate Anti-Corrosion ZB-500
Brand: Coatingsink
SKU: zinc-borate-anticorrosion-zb
Availability: InStock

Question 1

How does ZB-500 function as both a corrosion inhibitor and a flame retardant?

Accepted Answer

ZB-500 releases zinc and borate ions under moist or aggressive conditions, which passivate metal surfaces and displace aggressive anions such as chloride. In fire exposure, the borate component forms a glassy melt that promotes char formation in intumescent systems and dilutes combustible gases, providing a dual protective mechanism within a single additive.

Question 2

At what loading level is ZB-500 typically used in anticorrosion primers?

Accepted Answer

In solventborne and waterborne anticorrosion primers, ZB-500 is typically incorporated at 5–15% by weight in the dry film, often replacing a portion of zinc phosphate. In intumescent coatings, loadings of 10–20% are common depending on the required fire-resistance classification. Excessive loading above 20% can increase water sensitivity of the cured film.

Question 3

Is ZB-500 compatible with epoxy, alkyd, and polyurethane binder systems?

Accepted Answer

Yes. ZB-500 is binder-agnostic and has been used successfully in epoxy, alkyd, epoxy-polyamide, and two-component polyurethane systems. Its low oil absorption (28–35 g/100 g) allows relatively high PVC without excessive binder demand. In waterborne systems, maintain pH below 9.0 to avoid slow dissolution of the zinc borate lattice.

Density	2.80 g/cm³
ZnO Content	37.5 ± 1.5%
Oil Absorption	28–35 g/100 g
Particle Size D50	5–8 µm
Chemical Composition	3.5ZnO·2B₂O₃·3.5H₂O

Zinc Borate Anti-Corrosion ZB-500

Specifications

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