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High-Low Temperature Gravel Impact Tester

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Web: qinsun-lab.com

Email:info@qinsun-lab。com

High-Low Temperature Multifunctional Aggregate Impact Tester is a professional testing instrument designed to accurately reproduce damage caused by flying gravel under controlled high- and low-temperature environments. This tester is mainly used to evaluate the stone-chip impact resistance of coatings, coating systems, plastics, glass, and other exterior materials. By precisely controlling impact angle, pressure, temperature, and test media, it allows comprehensive assessment of coating adhesion, interlayer bonding performance, brittleness, spall resistance, and impact durability under simulated real-world conditions.

Standards

The tester complies with and supports evaluation methods defined in the following international and industry standards:

(1) SAE J400 – Gravelometer testing for resistance of automotive coatings and materials

(2) VDA 621427 – Stone-chip resistance test for surface coatings

(3) ISO 20567-1 – Paints and varnishes – Determination of stone-chip resistance – Part 1: Multi-impact testing

(4) ASTM D3170 – Standard test method for chipping resistance of coatings

(5) GMW 14668-3.4.9 – Stone impact testing for automotive interior and exterior parts

Parameters

ItemSpecification
Test environment Temperature 5–35 °C, relative humidity ≤85% RH
Working pressure range 0–5.0 kgf/cm² (adjustable), max up to 8.0 kgf/cm²
Compressed air pipe diameter ≥19 mm
Air tank volume 180 L (maintains 400 kPa for ≥10 s)
Feeding method Automatic feeding, adjustable speed
VDA spray gun diameter 30.0 ± 0.5 mm
SAE spray gun diameter 52.6 ± 0.5 mm
Working time 0–999 s adjustable
Vibration time 0–999 s adjustable
Cycle count 0–99 cycles
Impact angle adjustment 3D adjustable test table, 0–180°, with digital angle display
Impact window size 300 × 300 mm (adjustable support, sample thickness ≤30 mm)
Chamber dimensions Approx. 1800 × 1000 × 1200 mm
Chamber structure ≥6 mm steel plate with coating; 10 mm steel impact window
Impact media 4–5 mm angular steel grit (61–65 HRC), 8–16 mm terrazzo, or JIS A5001 stones
Test pressure 100 ± 5 kPa, 200 ± 10 kPa
Test cycles 1–5 cycles
Spray duration 8–12 s / 500 g or 30–35 s / 2000 g
Spray angle 54° ± 1° (optional 90° ± 1°)
Spray distance 10–500 mm adjustable
Sample size 80 × 80 mm or 200 × 100 mm
Low temperature range −20 °C to −70 °C (settable)
High temperature range Ambient to 150 °C (settable)
Pressure range 0–1 MPa adjustable
Independent temperature chamber −40 °C to 100 °C
Noise level ≤120 dBA (hearing protection required)
Operation mode Continuous operation
Test media Gravel, sand, steel shot, iron shot
Feeding rate Adjustable via electromagnetic vibration feeder
Airflow control Built-in air storage ensures stable pressure and flow

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