Strength and optical transmission improvement of a sandblasted glass by chemical treatment in HF Hydrofluoric acid [Amelioration de la resistance mecanique et de la transmission optique d'un verre sable par traitement chimique a l'acide fluorhydrique]
Résumé
This work reports the effect of the chemical treatment by HF acid on the strength and the optical transmission of sandblasted glasses. Before treatment, the strength and the optical transmission of the sandblasted glass were respectively 40 MPa and 35.2 %. After treatement with hydrofluoric acid (HF), the strength increases. It reaches the as received glass strength (95 MPa) after 8 hours treatment in 5% HF solution. At the early stage, optical transmission drops, due to the grooving phenomena of the median cracks and scaling along the lateral crack. This drop is followed by a continuous improvement of the optical transmission in relation to the surface state improvement. After 8 hours of treatment in 5% HF, we measured an optical transmission of about 48%. © Lavoisier, Paris.