1. Look at the logo: Seiko’s logo is SEIKO. Seiko’s pure titanium eyeglass frames have brand marks on the temples, nose pads, etc. Be careful when purchasing and don’t make the mistake of being deceived by similar trademarks. . 2. Weigh the weight with your hands: Pure titanium frames are lighter, with a specific gravity of about 4.5 grams/cubic centimeter. This is one of the simple ways to distinguish titanium frames from non-titanium frames.

1. Look at the logo: Seiko’s logo is SEIKO. Seiko’s pure titanium eyeglass frames have brand marks on the temples, nose pads, etc. Be careful when purchasing, do not Make the stupid mistake of being deceived by similar trademarks.

2. Weigh the weight with your hands: Pure titanium frames are lighter in weight, with a specific gravity of about 4.5 grams/cubic centimeter. This is one of the simple ways to distinguish titanium frames from non-titanium frames.

3. Look at the price: The production cost of titanium and titanium alloy glasses is very high. They have high requirements in terms of buckling, stamping, cutting and welding. They are not easy to weld and electroplat. The welding must be completed in a vacuum. Therefore, the price is relatively expensive, even if it is cheap, it will cost around four to five hundred. If the price is too low, there must be something wrong with the quality.

4. Look at the welding points of the nose pad stem and nose pad bucket: the welding of pure titanium material is vacuum oxygen-free butt welding, the weld mark here is in the shape of a "step", and the welding of alloy material is a point Welding, the weld mark is "slope" shaped.

5. Look at the gasket at the hinge joint: it is not advisable for pure titanium frames to have titanium in direct contact with titanium at the hinge, otherwise the joints will easily wrinkle and the temples will not open and close smoothly. Usually two thin gaskets are inlaid in the hinge part of the pure titanium frame to separate the upper and lower hinges.

6. Use magnets for magnetic reaction: loosen the hinge of the frame as much as possible, and use a magnet to attract it in a free-moving state. If the frame is not attracted, it means that the frame is made of pure titanium material.