1. official seal pattern: the overall feeling is uniform and clear, the lines are smooth, the appearance is three-dimensional, the seal surface is smooth and shiny, and there are no defects such as burrs and scratches. The characters in the pattern are generally "SF Express" or "SF Express".
2. Manufacturing process: the manufacturing process requires fine requirements, and the surface of the seal has no defects such as burrs and scratches. The official seal has a three-dimensional sense of two-dimensional code, which is carved or embossed by laser, giving people a sense of bump. The color is generally red or blue, and the color is bright. The edge of the official seal shall be regular and free of burrs, and the raised part shall be smooth and consistent without obvious discoloration. The bottom edge of the official seal will be worn in some places, which belongs to normal wear and does not belong to quality problems.
3. Sealing material: mostly made of high-quality rubber, soft to the touch, easy to seal and clean. Rubber seals are generally soft, while steel seals are heavy. The head and handle are integrated, and the joint is smooth and burr-free. The seal may be slightly damaged or deformed after being used for a long time, but this does not affect the identification of authenticity. In addition, the color of the official seal cannot be suit or other colors, and red or blue must be specified.
4. Seal arts and sciences: the arts and sciences are neat, the fonts are clear, and the handwritten printing depth is consistent. Font size, line thickness, verticality and other aspects are in line with the specifications, and the deviation cannot be too large.
5. Seal imprint: the whole is clear, the line thickness is uniform, and there is no smudge, decoration, decoloration and other phenomena. It can be observed that the stamping depth of the seal is consistent and the pressure is uniform.
If the appearance, color, shape, material and other information of the official seal meet the requirements, then this official seal is the official official seal of SF Express.