How to judge the quality of phone cases

1、 Material identification
Liquid silicone shell
Touch test: After pressing, it quickly rebounds without any residual marks, making it a true liquid silicone gel
Odor inspection: High quality silicone has no pungent odor, while inferior shells may have a plastic smell
Plush lining: Fine and even flocking can reduce wear on the phone back panel
TPU shell
Transparency: High quality TPU has high transparency and is not easily yellowed (anti yellowing technology)
Elasticity test: After stretching, it should quickly return to its original state without permanent deformation
Metal/PC shell
Edge treatment: No burrs, concealed molding line is preferred
Weight control: Overweight may affect portability

2、 Process details
Hole position accuracy
The buttons, charging ports, and lens holes should be completely aligned with a deviation of ≤ 0.5mm
Protective design
Four corner thickening or airbag structure can enhance drop resistance
The lens frame should be at least 0.3mm higher than the lens
Surface treatment
UV printed patterns should be wear-resistant, with no peeling off when scratched by nails
The electroplating layer is uniform without bubbles, and the metal shell needs to be anodized for rust prevention

3、 Security certification
Environmental standards
Identify GB4806.7 food grade certification and avoid harmful substances such as phthalates
Odor warning
The shell that emits a pungent odor after heating may contain formaldehyde/benzene derivatives
Brand logo
Legitimate product labeling materials, execution standards, and manufacturer information

4、 Guide to Avoiding Pits
Low price trap: 9.9 yuan free shipping case may use recycled plastic, with lead content exceeding 30 times the standard
Functional verification: The magnetic suction shell needs to be tested for adsorption force (preferably ≥ 1kg)
Durability test: Repeatedly disassemble and assemble 10 times without deformation or cracking

Summary and Suggestions
Priority selection: Liquid silicone (real food grade) or TPU+PC composite material
Careful selection of types: unmarked transparent shell, metal signal shielding shell, cheap shell with obvious odor