The group standard for The Determination of Silica Hydroxyl content on the Surface of Gas phase silicon dioxide (GSIO2) was published and implemented

    The group standard "Test Method for The Content of Silica Hydroxyl on the Surface of GAS phase silica" (T/FSI 490-2020) was officially released on April 30, 2020 and formally implemented on May 30, 2020.

    Gas phase silicon dioxide is obtained by hydrolyzing halide silane in high temperature flame white amorphous powder, small size, large specific surface area, the characteristics of strong surface activity, are widely used in silicone rubber, adhesives, paint, ink, electronics, food, medicine and other fields, reinforcing, thickening and thixotropic, anti-settling, sag resistance, anticaking etc. Function.

    However, due to the large amount of SiO on the surface of gas phase silica, it is easy to absorb moisture and affect dispersion. Meanwhile, the abnormal content of SIO will also affect its performance. SThus, it can be seen that the content of SiO on the surface of gSIO is one of the important technical indexes of GSIO products. Since there is no standard test method to test the content of SIO on the surface of gSIO, this index is not included in the gSIO product standard.

    Based on gas phase silica surface hydroxyl content the importance of technical indicators and the status quo of the current domestic and foreign standards, rich research institute co., LTD., guangzhou remit to the China association of fluorine and silicone material industry is put forward in the gas phase silica surface hydroxyl content test method "group standards applied for and the projects (project approval document: fluorine and silicon association [2018] no. 9, project number: FGJ2018013), established the silica surface hydroxyl content test method group standard working group, from guangzhou collect rich research institute co., LTD., as a group, secretary general of the unit.Based on the practicability and reliability of the standard, "acid-base titration" and "reactive gas chromatography" were selected as the standard methods. The implementation of the standard provides a standard basis for the determination of the content of silica on the surface of gSIO2, which is of great significance for the quality control and performance evaluation of gSiO2 products.After the completion of the international standard "silicon rubber gas silica" (ISO18473-3) and the revision of the national standard "Nano alumina" (GB/T 26824), the company has achieved another achievement in the standardization work.