Sapphire glass, renowned for its exceptional hardness, high optical transmittance, and superior wear resistance, has become a preferred optical material in precision instruments such as watches, camera lenses, and smartphone displays. Nevertheless, despite its inherent scratch resistance, improper storage and maintenance may compromise its service life and optical performance. This document outlines scientifically validated methods for the proper storage and maintenance of sapphire glass.

1. Precautions for daily storage

(1) Avoid contact with hard objects

Despite its Mohs hardness of 9, scratches may still occur when it is rubbed against high-hardness substances such as diamonds and gravel for an extended period. It is recommended that storage is carried out in the original factory-provided soft warranty box, or in a soft cloth if the original box is unavailable. Please ensure that it is not placed randomly on the table or mixed with other accessories.

(2) Control the environmental humidity and temperature

While sapphire glass is capable of withstanding high temperatures, it is important to note that harsh environments may have an impact on its coating layers, including anti-reflective coatings. It is advisable to avoid long-term exposure to high-humidity environments, such as bathrooms and saunas, in order to prevent the coating from oxidizing and peeling off. At the same time, please note that it is advisable to avoid placing a watch with sapphire glass near a radiator during the winter months. Sudden changes in temperature may cause the internal adhesive layer to crack.

(3) Prevent harm from chemical corrosion

Substances containing acids, alkalis or salts, such as perfume, sunscreen and seawater, may cause corrosion to the metal frame or coating at the edge of the glass. Following use, it is recommended that the glass be wiped with a soft cloth. Sweat after exercise should also be cleaned up promptly.

2. Cleaning methods and tool selection

(1) Light dust

Firstly, it is essential to use a balloon blower or a soft-bristled brush to remove surface particles. This will help to avoid scratching the coating when wiping directly.

(2) Fingerprints or oil stains

A lens pen or microfiber cloth moistened with a small amount of distilled water or isopropyl alcohol can be used to gently wipe the lens in a spiral motion from the centre outwards, taking care to avoid any damage to the lens. Please note that glass cleaners containing ammonia should be avoided, as their alkaline components may damage the coating.

Maintaining sapphire glass requires a balanced approach that considers both scientific principles and practical considerations. During daily storage, it is important to keep it isolated from hard objects and chemical substances. When cleaning, special tools should be chosen. It is essential to carry out regular maintenance and to view its physical properties rationally. Sapphire glass, when maintained correctly, will retain its transparency for a significant period of time, making it a reliable component for precision equipment.