GB/T 45758-2025 Determination of bacterial reduction rate by photocatalytic materials under indoor lighting environment—Semi-dry method for estimating antibacterial activity on the actual environmental bacteria contamination surface

Scope

This document describes a method for testing the antibacterial performance of photocatalytic materials with indoor light response on surfaces. The antibacterial activity value is characterized by measuring the number of surviving microorganisms after indoor lighting treatment. This test sets up a surface that people frequently touch and may thereby contaminate with bacteria, and evaluates its antibacterial performance by using photocatalytic materials under indoor lighting conditions to inhibit microorganism contact and infection. This document is applicable to indoor light response photocatalytic materials used in different types, for different purposes, and with different shapes of building materials, such as boards, sheets, and flat materials. It is not applicable to powdered, granular, and porous indoor light response photocatalytic materials, nor to fabrics or textiles. This document is applicable to indoor light response photocatalytic materials with antibacterial functions, but not to other uses of indoor light response photocatalytic materials, such as the degradation of water pollutants, self-cleaning, anti-fogging, and air purification performance.

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