ASTM D1148 Compliant UV Anti-Yellowing Aging Test Chamber with UV300W Sunlight-Simulation Lamp and Forced Hot-Air Circulation Heating

The UV Anti-Yellowing Aging Test Chamber — also known as a bulb-type UV discoloration tester or yellowing resistance tester — determines how well white and light-colored materials resist yellowing under simulated sunlight and heat.

A 300 W UV bulb irradiates specimens placed on a slowly rotating φ300 mm turntable, while a forced hot-air circulation system holds the chamber at a set temperature up to 80 °C. After the programmed exposure period, the exposed specimen is compared with an unexposed control (or a standard grey scale) to grade the degree of discoloration.

Typical test materials include shoe soles, leather, PU, rubber, fabrics and other light-colored polymer or coated substrates.

The φ300 mm perforated stainless-steel sample disc rotates at 3 ± 1 rpm so that every specimen receives the same UV dose, removing the "hot spot" bias of static sample placement.

A top-mounted 300 W UV lamp with reflector works together with forced hot-air circulation and perforated SUS304 inner walls, giving even temperature distribution across the 50 × 50 × 60 cm working volume.

Mirror-polished SUS304 stainless-steel interior resists corrosion and wipes clean easily; glass-fiber insulation limits heat loss; the baked-enamel steel exterior keeps the cabinet looking new. The unit is fitted with a front observation window, a side control cluster (temperature controller, LED timer, indicators, ammeter and main switch) and heavy-duty caster wheels for easy repositioning.

An EGO over-temperature protection device cuts power to the heating circuit and triggers an indicator if the set limit is exceeded, while a safety overload switch with ammeter protects the electrical circuit during long unattended runs.

Light intensity is adjustable, and the 0–9,999 h LED timer supports both short QC screening cycles and extended aging programs.

ASTM D1148, ASTM D2438, JIS-K6301

Note: These methods are commonly referenced for evaluating UV/heat-induced discoloration of white or light-colored surfaces. Please state the exact standard and revision required by your laboratory when requesting a quotation so the configuration can be matched accordingly.

1. Replace the UV bulb after 1,000 hours of accumulated operation to keep irradiance consistent.
2. Do not look directly at the lit UV lamp; keep the door closed during a running cycle.
3. Keep the perforated chamber walls and turntable clear of debris so hot air can circulate freely.
4. Verify a single-phase AC 220 V / 15 A supply before installation.
5. Grade and record specimens promptly after exposure, using a consistent reference sample and lighting conditions for comparable results.