Name: Silver Ion Antimicrobial Additive SI-500 (Zeolite-Supported)
Brand: Coatingsink
SKU: silver-ion-antimicrobial-additive
Availability: InStock

Question 1

How does the zeolite carrier in SI-500 provide controlled, long-lasting silver ion release?

Accepted Answer

Zeolites are crystalline aluminosilicate frameworks with ion-exchange sites. Silver ions (Ag⁺) are loaded into these exchange sites during manufacturing. When incorporated into a coating film exposed to moisture, Ag⁺ ions are slowly released by ion exchange with cations in the environment (Na⁺, H⁺, Ca²⁺), providing a sustained, low-level antimicrobial release over months to years. This controlled release mechanism prevents the rapid silver depletion seen with silver salt or silver nanoparticle additives, making SI-500 effective for the service life of the coating.

Question 2

What regulatory registrations are required to market SI-500-containing coatings as antimicrobial in EU and China?

Accepted Answer

In the EU, coatings marketed with antimicrobial claims are regulated under the Biocidal Products Regulation (BPR, EU 528/2012) — the silver zeolite active substance requires BPR approval (currently under review in PT7 for preservatives in materials). In China, antimicrobial coatings are regulated by GB 21551.1 and related standards requiring third-party testing. In the USA, EPA registration under FIFRA is required for public health antimicrobial claims on products sold commercially. For 'product protection' claims (preventing degradation of the coating itself) the regulatory pathway is less stringent in most markets. Always confirm regulatory status with your compliance team before making antimicrobial efficacy claims.

Carrier	zeolite (aluminosilicate)
Silver Content	3.0–4.5%
Recommended Dosage	1–5%
Particle Size (d50)	3–6 µm
Antimicrobial Spectrum	bacteria, fungi, mold (MRSA, E. coli, Candida)

Silver Ion Antimicrobial Additive SI-500 (Zeolite-Supported)

Specifications

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