Impregnation bonding

I. Impregnation bonding method Impregnation method is the earliest and most widely used method in chemical bonding method. It is also called full impregnation or saturated impregnation. It is developed from the traditional saturated dyeing process. Basic process flow: The web is fed into a dip ta-----!

September belongs to sapphire

The birthstone is a lucky stone that people wear when they commemorate their birthdays to evoke good memories and bless the future. The autumn in September is the best season for a bumper harvest. The birthstone belonging to September is a sapphire with a lucky light. Sap-----!