Frequently Asked Questions.
The light that hits the sample is called the incident light (T1), while the total light that passes through the sample is termed the transmitted light (Tt). The scattered light that emerges at an angle greater than 2.5° after passing through the sample is known as scattered light (specifically Td). Haze is calculated as the ratio of this scattered light (Td) to the transmitted light (Tt), and transmittance is determined by the ratio of the transmitted light (Tt) to the incident light (T1). This explains the measurement principles of haze and transmittance.
The main operational difference between these two standards when measuring transmittance parameters is that under the ASTM standard, the compensation port is closed when measuring both haze and transmittance. In contrast, under the ISO standard, the compensation port is open when measuring transmittance.
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