How to choose eye-protecting films? Pay attention to these five hard indicators
Guide
Light transmittance, haze, reflectance, hardness and wear resistance, and impact resistance - five hard indicators worth checking one by one when choosing eye protection films, as well as how to understand third-party test reports.
When faced with a dazzling array of "eye protection film" promotions, it is better to look at the indicators than to listen to the concepts. The following five hard indicators each have corresponding detection methods.
01. Light transmittance: The higher, the clearer
The light transmittance determines the transparency of the picture. The excellent level is≥96%(Measured at 96.5% by Woowhead Guanfudun SGS) The detection basis is usually spectrophotometry.
02. Haze: The lower, the more transparent
Haze measures the degree of light scattering when passing through a material. The higher the haze, the more "foggy and whiter" the picture appears. An excellent level is<1%(SGS measured 0.4%).
03. Reflectivity: Determines the anti-glare ability
The surface reflectivity of ordinary glass is about 4%, which is the main reason why the screen "looks like a mirror". After using magnetron sputtering AR coating, it can be reduced to≤0.5%. When purchasing, you can directly ask the merchant about the reflectance value and the detection method marked.
04. Hardness and wear resistance: Adhere to two standards
Pay attention to the distinctionMohs hardnessIt has two different standards from "Pencil 9H" - the Mohs 6H can resist scratches from daily keys and coins. The wear resistance of the oleophobic layer can be determined by the water droplet Angle data (for example, initially 115°, and approximately 105° after 10,000 wear-resistant reciprocations).
05. Impact resistance: Check the third-party drop ball test
For example, the drop test of a 64g steel ball from 1.2 meters.Reports from third-party institutions such as SGS are more reliable than promotional slogansWhen making a purchase, it is recommended to directly ask the merchant to show the test report number. You can give priority to choosing brands with transparent and verifiable data.