China Testing & Certification International Group Co., Ltd. (CTC, Stock Code 603060) originated from the testing and certification business of China Building Materials Academy in the 1950s. After 70 years of unremitting efforts and persistent pursuit, the company has formed five business categories: detection and testing, certification and evaluation, testing instruments and intelligent manufacturing, measurement and calibration, scientific research and technical services, committed to providing customers with technical services and comprehensive solutions of detection and testing, certification and evaluation, appraisal, consultation, training, and instruments and equipment in fields of quality, environmental protection, green, safety, health, and energy conservation.

In recent years, various types of negative ion generating devices and functional materials have been widely used in environmental protection, medical and other fields due to the remarkable characteristics of negative ion products, such as degrading toxic pollutants, effectively removing haze, and improving human health. However, there is a wide variety of negative ion products, with significantly different production principles, usage conditions, and negative ion generation levels. Therefore, evaluating negative ion concentration is particularly important.
Materials capable of generating air ions, such as wood-based panels, flooring, coatings, wall felts, putties, ceramic tiles, decorative films, wallpapers and wall fabrics, etc.
Amount of negative ions generated in the air
Amount of air ions induced by materials
GB/T 28628-2012: Test method for air ion concentration induced by materials
JC/T 2040-2010: Negative ion functional building interior decorative materials
HG/T 4109-2009: Negative ion functional coatings
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