久久久免费精品视频,一区二区三区爽爽爽,日韩又大又粗又黄,美女小穴妖精视频鸡插入

News

The physical properties that can be brought about by the use of sapphire crystal mirrors

Time:2023-10-27

Sapphire watch mirrors have high hardness and scratch resistance, which are two important factors determining the quality of watch mirrors. Mohs is usually used to indicate the hardness of an object, for example, the hardness of mica is 1 Mohs, the hardness of diamond is 10 Mohs, the hardness of glass is 5.5-7 Mohs, and the hardness of sapphire reaches 9 Mohs, which means its hardness is close to that of diamond.

1. Improve the transparency of the watch

Sapphire crystal is a highly transparent material that allows the watch dial to be more clearly visible. Compared with traditional glass mirrors, sapphire mirrors are more transparent and can clearly display the structure and movement components below the watch dial, allowing people to better understand the internal structure and working principle of the watch.

藍寶石表鏡

2. Improve the wear resistance of the watch

High hardness, using sapphire mirror on the watch can improve its wear resistance and avoid scratches on the mirror due to long-term wear, which affects the appearance of the watch.

3. Enhance the aesthetic appeal of the watch

Sapphire watch mirrors have high transparency and glossiness, which can make watches more beautiful and elegant. In addition, under sunlight, it will present a unique luster, adding many highlights to the watch.

4. Improve the waterproof performance of the watch

The high hardness and density effectively improve the sealing performance of the watch case, making the watch more waterproof. At the same time, a smooth surface can prevent moisture from staying on the watch dial, preventing the watch from malfunctioning due to water intrusion.

5. Improve the resale value of watches

When a watch uses a sapphire mirror, it can not only improve the quality and performance of the watch, but also increase its collection value and resale value. Due to the material and craftsmanship, the production cost and selling price of watches are relatively high, which effectively increases the market value of watches.

When sapphire is used to make watches, its impact resistance, sealing performance, and strength are much higher than watches made of other materials. However, sapphire watch mirrors are fragile, which is why they can also be damaged if not properly maintained. For sapphire watches with obvious and deep scratches, they can only be sent to a professional watch repair shop for corresponding treatment.

无码久久久久| 波多天天干一区| 日本久久久A好| 天天躁狠狠夜躁2020| 操哭你在线播放免费视频| 成人大香蕉Av电影| 欧美台湾佬娱乐中文网23| 欧性久久久久| 嗯嗯啊啊啊嗯嗯嗯久久| 久久精品国产亚洲色欲99| 少妇内射久久网。| 大操国产对白| 抽插太猛了视频男女白浆| 欧美精品综合一区中| 亚洲自拍偷拍自拍偷拍| 色站综合一区| 自拍视频国产亚洲欧美| 一区二区sad区精品| 97视頻| 换脸一区二区在线观看| 99人妻人人| 日韩女同毛片区二区| 久久国产91久久国产91| 国产欧美日韩亚| 欧美日韩精品五区| 日韩精品中文字幕一区二区三区h| 欧美精品免费aaa级| av在线1024| 黄片欧它日| 蜜桃久久久久久久| 日本久久亚洲八区| 久久久一区二区网站| 日韩 欧美亚洲91| 人妻久久公司| 欧美高清无码图片日韩| 欧美 自拍偷拍 一区| 日本十八禁一区二区在线观看| 中文字幕美女、| 久久小黄片欧美| 国产淫视频免费| 久久黄色毛片视频特级|