The QCJ-120 (120A, 1208) series paint film impactor is used for the impact resistance test of the film coating, which is represented by the maximum height of 120 cm when the weight of a fixed mass falls on the test plate without causing damage to the paint film. After the impact head of this instrument impacts the type plate, there is no secondary rebound phenomenon.

GB/T5237.4-2000 Aluminum alloy building profiles Part 4 Powder coating profiles.
| model | QCJ-120 | QCJ-120A | QCJ-120B |
| Instrument scale length | 120±0.2cm | 120±0.2cm | 120±0.2cm |
| graduation | 1cm | 1cm | 1cm |
| Hammer mass | (1000±1) g | (1000±1) g | (2000±2) g |
| Impact head specification | sφ8mm | sφ16mm | sφ16mm |
| Pillow Block Hole Diameter | φ15mm | φ15mm | φ16.3mm |
| radius of curvature | R2.5-3mm | R2.5-3mm | R2.5-3mm |
| Impact depth of impact head | (2±0.1) mm | (2.5±0.1)mm | (2.5±0.1)mm |
| Standards | GB/T1732-93 Determination of impact resistance of paint film | GB/T5237.4-2000 Aluminum Alloy Architectural Profiles Part 4 Powder Coated Profiles | ASTM D2794-92 Test Method for Resistance of Organic Coatings to Rapid Deformation (Impact) Effects |