Volvo 1024,7132 – Stone Chip Resistance Test

Volvo STD 1024,7132 defines a laboratory procedure that verifies how well surface coatings withstand gravel impact. The test reproduces the effect of road debris striking painted surfaces and determines whether coatings protect the underlying substrate.

The scope covers flat test panels with coatings under evaluation. The standard complies with SAE J400 and applies to Volvo Group vehicles. For Volvo Cars, the separate standard VCS 1024,71329 applies. Volvo STD 423 is a group of Volvo internal testing standards focused on accelerated corrosion tests, while STD 1024,7132 specifically verifies mechanical impact resistance. Suppliers to Volvo use this method to validate that paint systems meet strict quality standards.

Volvo adheres to its own standards to ensure uniform quality across its vehicle lineup. Test panel conditioning follows Volvo STD 1021.1, which verifies panels have reached the specified temperature. Equipment references SAE J400 for gravelometer specifications.

When combined with corrosion evaluation, additional Volvo STD requirement standards apply, such as STD 121-0001, STD 121-0006, and STD 121-0014. Results are evaluated against standardized rating scales in accordance with ISO methods. Adhesion is an important factor in total corrosion resistance, and multiple test methods exist for measuring adhesion alongside chip testing.

Pre-test inspection verifies that test panels are flat and fit the gravelometer holder. The test panel material, thickness, and pre-treatment must be consistent across all panels in a series to protect result accuracy.

Conditioning follows Volvo STD 1021.1, with panels stored until reaching specified temperature. During gravel projecting, the coated side faces the mechanism. The time for all gravel to enter the air stream must be below 0.5 minutes. Post-test, panels return to room temperature before tape application verifies coating adhesion. It is not allowed to use tools such as a knife to remove paint chips.

Chipping degree is determined by counting and measuring all chips on a 100 x 100 mm area. Chips are defects penetrating at least the topmost layer. The rating system verifies performance through combined number and size categories that protect against subjective evaluation.

A triple test is usually carried out and grades are averaged, rounded to the nearest higher integer. Adhesion assessment verifies bonding between layers through tape pull-off, and photographic documentation is required to protect traceability of observations.

• Controlled gravel impact is directed at a coated test panel using a gravelometer.
• Testing is performed under defined temperature conditions (typically room temperature or cold condition).
• After impact, adhesive tape is applied and removed to detach loose coating fragments.
• Damage is evaluated by counting and sizing stone chips; a stone chip is damage that penetrates at least one coating layer.
• Partly aligned with SAE J400 (chip resistance of surface coatings).