Working principle and test standard of sand & dust test chamber Why do we need to do a dust test? The dust test is mainly used for dust simulation testing of low-voltage electrical appliances, motors, instruments, meters, electronic products, and lam...

What is a horizontal peel tensile tester? Working principle and operation steps 1. Working Principle Horizontal tensile testing machine is a device used to test the tensile properties of materials in the horizontal direction. It usually consists of a...

Discover the standard method for evaluating the reduction rate of culturable airborne bacteria by air purifiers using a test chamber. This comprehensive guide outlines the procedures, equipment, and metrics necessary for accurate assessment. Learn how to effectively measure air purifier performance, ensuring cleaner and healthier indoor air quality. Explore the significance of this method in both residential and commercial settings, and understand its implications for public health and safety. Ideal for researchers, manufacturers, and consumers, this resource provides essential insights into the efficacy of air purification technologies. Enhance your knowledge and make informed decisions about air quality management with our expert recommendations.

How is colour fastness rated? Most of the existing colour fastness test methods are based on simulated or combined tests in accordance with the environment and conditions in which they are applied, and the fastness is rated according to the discolouration of the sample and the staining of the lining fabric after the test. What is more special is that the colour fastness to light is rated by blue standard, while the colour fastness to dry cleaning will be rated by solvent staining. In the rating of colour fastness, the changes in the three attributes of colour, i.e. hue, lightness and purity, are assessed comprehensively. Hue refers to the appearance of a colour. Among the three attributes, hue can be used to differentiate between colours. Depending on the wavelength of the light, colours have the properties of red, yellow or green, which are called hues. Depending on the degree of light reflected from the surface of an object, the colour will have a different degree of lightness or darkness which is called luminance. Purity refers to the degree of saturation of a colour, the simpler the wavelength of light, the higher the purity of the hue and vice versa the lower the purity. Colour fastness rating can be divided into eye rating and instrument rating. Gaze rating, the requirements of the background should be neutral grey, similar to the grey sample card between level 1 and level 2 (similar to the Montserrat colour card N5). Lighting conditions should be sunny day light (9:00-15:00), or illuminance in 600lx and above the equivalent light source, incident light and textile surface about 45º angle, the observation direction is roughly perpendicular to the surface of the textile, covering the original sample and test after the sample of the set of plate colour should be the same, it is appropriate to use the neutral colour or grey or black, size and shape are roughly the same. The rating personnel should wear neutral grey overalls, and the rating proces

Aluminium profile coating wear resistance test method analysis Considering the use of aluminium alloy profiles in construction projects, the commonly used testing methods for the abrasion resistance of aluminium profile coatings in China mainly include: (1) the falling sand test method (2) the sand blasting tester method (3) the wheel grinding tester method (4) the Taber test method, etc. It is of great significance to master the characteristics of various testing methods and conduct in-depth analysis and research on the characteristics and standards of various testing methods to ensure the quality of aluminium alloy profiles. It is of great significance to ensure the quality of aluminium alloy profiles. 1.The necessity of aluminium profile coating abrasion resistance test method For aluminium profiles used in construction, the abrasion resistance of aluminium profile coating is an important basis for improving the quality of profiles, and the use of a variety of methods to test the abrasion resistance of aluminium profile coating can reflect the test results of various methods. Our country commonly used falling sand test method to test the abrasion resistance of architectural aluminium profile coating, after experimental research, found that the reproducibility of this test method is poor, the operation is not strong, increasing the difficulty of work. Therefore, in recent years, our country has been on the construction of aluminium profile coating abrasion resistance test, in practice, pay more attention to the use of sand blasting test method, this test method in the operation is very simple, and spend a shorter time. 2. Falling sand test method and evaluation (1) Falling sand test method GB5237-2008 falling sand test method stipulates the abrasion resistance test method of aluminium alloy profiles, taking natural quartz sand as the main abrasion resistant material, the principle adopted in this test method is that the abrasive materia

Acceleration impact tester working principle Acceleration Impact Tester is a machine used to test the ability of a product to withstand impact damage during transport or use. 1.Working principle: (1) By adjusting the falling height of the table top (collision test) or changing the compression of the compression spring (impact test), you can change the acceleration value of the impact pulse. (2) When the table top impact body rises to a certain height, that is, the fall impact on the buffer pad, resulting in a half-sinusoidal impact pulse. (3) Adjust the thickness and material of the cushion can change the duration of the pulse. (4)The DC motor drives the deceleration lifter, with the help of rolling support to push the impact body, the table surface upward movement. (5) Changing the rotational speed of the DC motor can change the repetition frequency of the pulse. 2.Features: (1)High system reliability and complete protection function. (2)Complete impact, collision two kinds of tests (3) Expandable after the peak sawtooth wave and trapezoidal wave and other impact waveforms (4)Closed-loop control of acceleration in collision test, high control accuracy. (5) Photoelectric feedback. (6)High rigidity of working platform, good uniformity of peak acceleration of table surface