CHINA NBC-NH-225B Non-yellowing Test Chamber 225L with turntable

Overview

Yellowing is one of the manifestations of aging, and the cause of yellowing may be light or heat, and the yellowing of the color under the action of natural sunlight and ultraviolet rays for a long time or under the action of heat, oxygen, stress, trace moisture, impurities, improper processes, etc., is called yellowing.

The yellowing resistance Test Chamber is suitable for simulating the ultraviolet radiation and heat of sunlight, the sample is irradiated by ultraviolet rays and temperature in the machine, after a period of time, the degree of yellowing resistance of the sample is observed, and the stained gray mark can be used as a reference to determine the level of yellowing, and the test time is determined according to the manufacturer's agreement. The machine has complete accessories, which can be used as a basic yellowing resistance test, or as an aging testing machine and oven, showing the function of one machine for multiple purposes.

use

It is used for the accelerated yellowing test of materials (generally at 60 °C, the material is tested in this chamber for 3 hours, which is equivalent to the yellowing result of 2 months in the natural environment). The yellowing grade of the material can be determined by the gray label of pollution. It is also possible to visually measure the degree of yellowing of the material

2. The influence of light

When the material absorbs light energy, the molecular chain on the absorbed site will produce carbon-carbon bonds or cleavage of carbon-hydrogen bonds.

Influence of heat and oxygen

The oxidation of the material occurs, and the heat accelerates the oxidation process of the material. After the formation of peroxide structure, free radicals are easily formed, resulting in discoloration of light and white materials. Oxygen has the most significant effect on the destruction of unsaturated diolefin materials, and the thermal effect, in addition to activating oxidation, can also lead to the breaking of -C-C- bonds and the rupture of double bonds.

Influence of other factors

The yellowing is also related to the additives added to the material, the presence of moisture, impurities, and the processing and production process. The inclusion of various chemical or mechanical impurities can reduce the stability of the polymer. The reasons are complex and require specific analysis of specific problems.

Therefore, both the photoaging test and the thermal aging test are a type of yellowing resistance test. Commonly used standards for yellowing resistance testing are ASTM D1148, and so on. According to the phenomenon that light-colored or white products are prone to yellowing under long-term exposure to natural sunlight, the yellowing resistance Tester uses a solar bulb or lamp and a heating temperature control device to simulate the natural environment, and uses a sunlight bulb and a heating temperature control device to irradiate the sample within the specified time. Observe the change of the surface color of the sample to determine the degree of discoloration of the sample, so as to determine the ability of the material to resist yellowing under sunlight radiation.  It is suitable for arbitration and precision scientific research and development work.

Meets standards

The yellowing resistance Tester conforms to ASTM-D1148, AATCC16-1998, HG/T 3689 and other national standards

Cabinet structure

Light source: 1 standard yellowing resistant lamp×

Weight: 120kg

Accessories

Product Manual

After-sales service agreement

Equipment regular maintenance book (one set each)

One adjustable compartment,

Mobile casters (4 pcs)

Maintenance

1. Clean the surface and inner cavity dust to keep the machine clean.

2. Check whether the current of the ammeter is the same as normal, and if there is any abnormality, notify the maintenance worker for maintenance.

3. If there is a sudden power failure, turn off the heating switch to prevent it from starting automatically when the call comes.

4. Check whether the fan is running normally, whether there is any abnormal sound, if there is any, immediately turn off the machine and notify the maintenance worker for maintenance.

Maintenance

1. Check the vents for blockages and remove the accumulated dust.

2. Whether the fan is operating normally.

3. The maintenance worker checks whether the current is normal.

4. Check whether the thermostat is accurate, if not, adjust the static compensation or sensor correction value of the thermostat.

5. Check whether the heating element is damaged and whether the wiring is aging.

6. Check if the delay is accurate

host x1, manual x1, certificate of conformity

[Note] Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.