Temperature test

1. High temperature, low temperature, constant temperature and humidity

Temperature: Temperature is a physical quantity that expresses the degree of hotness and coldness of an object. Microscopically speaking, it is the intensity of thermal motion of the molecules of an object.

Humidity: A physical quantity indicating the degree of dryness of the atmosphere. At a certain temperature, the less moisture there is in a certain volume of air, the drier the air is; the more moisture there is, the more humid the air is.

High and low temperature testing: Mainly used to assess the adaptability of electricians and electronic products to storage and/or use under high or low temperature conditions.

Constant temperature and humidity test: It is mainly used to assess the adaptability of electrical and electronic products, components, materials, etc. to use and storage under constant humidity and heat conditions.

Alternating heat and humidity test: It is mainly used to assess the adaptability of electrical and electronic products or materials for use and storage under heat and humidity conditions where temperature cycles change and condensation occurs on the product surface.

Temperature change test:

Temperature changes that specify transition times are primarily used to determine the ability of components, equipment, and other products to withstand rapid changes in ambient temperature;

Temperature change that specifies the rate of temperature change, mainly used to determine the ability of components, equipment and other products to work under changes in ambient temperature;

The two-liquid bath method temperature change is mainly used to determine the ability of components, equipment or other products to withstand rapid temperature changes. It is mainly suitable for glass-metal seals and similar test samples.

2. Hot and cold shock, rapid temperature change

Temperature change rate: The temperature change rate represents a quantity that indicates how quickly the temperature changes. The unit is degrees/minute.

Hot and cold shock test: When the sample suddenly enters a low temperature environment from a high temperature environment, it is considered a hot and cold shock.

Rapid temperature change: The commonly referred to hot and cold shock test is a temperature change test (Nb) that stipulates the temperature change rate in temperature change test standards such as GB and ICE. It is generally greater than 2℃/min and requires a rapid temperature change box test. .

(2) Light aging test
Blackboard thermometer: It is composed of flat stainless steel. The side of the flat plate facing the light source is coated with a black flat coating. A black-coated rod-shaped bimetallic disk or thermometer is located in the center of the plate and firmly connected to the light side of the blackboard. Resistive sensor test to measure plate temperature. It represents the highest temperature that may be reached on the surface of the specimen.
Black standard thermometer: It is composed of flat stainless steel. The side of the flat plate facing the light source is coated with an aging-resistant black flat coating. The temperature of the flat plate is measured through a platinum resistor installed on the backlight side and in good thermal contact with the center of the flat plate.

Xenon lamp: A photocell or flash lamp filled with xenon gas. Its spectral energy distribution is similar to the ultraviolet and visible parts of sunlight.

Fluorescent ultraviolet lamp (UV lamp): A fluorescent lamp that emits ultraviolet light below 400nm and accounts for at least 80% of the total output light energy.

Common test standards include:

UV test:

ASTM G154-2016 Non-metallic materials UV fluorescent lamp exposure

ISO 4892.3-2016 Methods for exposure of plastics to laboratory light sources Part 3, Fluorescent UV lamps

GB/T 16422.3-2014 Plastic laboratory light source exposure test methods Part 3: Fluorescent UV lamp

Commonly used xenon lamp tests:

ASTM G155-2021 Standard Practice for the Use of Xenon Arc Lamp Equipment for Exposure of Non-Metallic Materials

ISO 4892-2-2013 Methods for exposure of plastic laboratory light sources Part 2, Xenon light source

GB/T 16422.2-2014 Plastic laboratory light source exposure test methods Part 2: Xenon arc lamp

Xenon lamp: A photocell or flash lamp filled with xenon gas. Its spectral energy distribution is similar to the ultraviolet and visible parts of sunlight.

Fluorescent ultraviolet lamp (UV lamp): A fluorescent lamp that emits ultraviolet light below 400nm and accounts for at least 80% of the total output light energy.

The purpose of the photoaging test: to obtain the results of the weather resistance of the material through an accelerated test that simulates the long-term exposure to natural sunlight.

Test sample requirements

UV test: The test sample is preferably a flat sample. The best sample size is: 60*95*5mm. The maximum sample thickness cannot exceed 5CM. If the sample thickness is too large, the radiation intensity obtained on the sample surface will be higher than the set value. Will lead to accelerated sample aging. If the customer's sample exceeds the size requirements of the test chamber, the sample needs to be cut.

(3) Salt spray
Salt spray types generally include:
Divided into neutral salt spray, acetate salt spray and copper accelerated acetate salt spray
The test objects are:
The neutral salt spray test is suitable for metals and their alloys, metal coatings, organic coatings, and anodized films;
The acetic salt spray test and the copper-accelerated acetic salt spray test are suitable for copper + nickel + chromium or nickel + chromium decorative coatings, and are also suitable for aluminum anodized films.
standard test

GB/T 2423.17 IEC 60068-2-11 GB/T 2423.18 IEC 60068-2-52;
ASTMB117 GB/T10125 ISO9227
(4) IP protection level
test definition
Prevent the entry of solid foreign objects and prevent the human body from approaching dangerous parts: IP1X~IP6X; a total of 6 levels.

Prevent harmful effects caused by water ingress: IPX1~IPX9, a total of 89 levels

standard test

GB/T 4208 IEC 60529 GB 7000.1 IEC 60598-1