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The Absolute Method Retro-Reflective Coefficient Tester is a precision instrument designed to evaluate the retro-reflective performance of high-visibility safety materials under both dry and simulated rain conditions. It accurately measures the retro-reflection coefficient of sample surfaces, making it suitable for occupational high-visibility warning garments and other visibility safety apparel to ensure personnel safety and compliance with national standards.

Application

The tester is suitable for a wide range of applications:

Traffic Safety Materials: Assessing retro-reflective performance of road and railway signs, traffic safety uniforms, and school uniforms for visibility compliance.

Occupational Safety Garments: Evaluating high-visibility protective clothing worn by various professionals for safe warning and visibility.

Vehicle Inspection: Measuring reflective markings on trucks and commercial vehicles.

Quality Control: Testing reflective vests, license plates, and other materials for retro-reflective compliance.

Standards

The system supports compliance with the following standards:

GB 20653-2020 – Occupational High-Visibility Warning Clothing, Appendices C.4.1 (Absolute Method) and D

GB/T 28468-2012 – School Traffic Safety Reflective Uniforms

ASTM E808 – Standard Guide for Description of Retro-Reflective Materials (Reference)

ASTM E810 – Standard Test Method for Retro-Reflective Coefficient of Sheeting Materials (Reference)

DIN 67520 – Minimum Luminance Requirements for Traffic Safety Reflective Materials (Reference)

Parameters

Parameter	Specification
Retro-Reflective Coefficient Range	0.01–500 cd/(lx·m²)
Observation Angle	12′–120′ (2°) adjustable, precision 3′, minimum division 1′
Incidence Angle	0.1°–40.0° adjustable, precision 0.5°, minimum division 0.1°
Sample Size	150 × 150 mm
Light Source	Standard illuminant A as per GB/T 3978
Sample Reference Center to Light Aperture	≤12′, vertical illuminance uniformity ≤5%
Sample Reference Center to Detector Aperture	≤12′, vertically adjustable for 12′–120′ observation
Detector Distance to Sample	≥15 m
Wet Test Parameters	Spray nozzle 1000 mm from sample, 10°±1° vertical angle, uniform water flow, enclosed spray chamber, water flow equivalent to 284 mm/h
Spray Chamber	Rigid transparent material with movable panel, 150 × 150 mm light channel, black-painted edges to reduce scatter
Spray Nozzle	Diameter 1.19 mm, connected to supply tube for stable conical water column
Power Supply	AC 220 V, 50 Hz, 1 kW
Main Console Dimensions	900 × 780 × 1700 mm
Sample Table Dimensions	630 × 430 × 1900 mm
Sample Table Weight	80 kg
Main Console Weight	115 kg
Test Environment	Dark room, temperature 20°C ±2°C, humidity 65% ±5%