The totally transmitted light consists of the directly transmitted and the diffused components. Depending on the angular distribution of the diffused portion, a transparent plastic will appear differently.

Visual perception can clearly differentiate two phenomena: Wide angle and narrow angle scattering.

Transparency

The appearance of a transparent product is defined by its application. Packaging film used in the food industry should be very clear and transparent, while film for grocery bags should be translucent and diffuse the light. Therefore, different raw materials are selected and processed under certain conditions.

The absorption and scattering behavior of the transparent specimen will determine how much light will pass through and how objects will appear through the transparent product.

Total Transmittance

Total transmittance is the ratio of transmitted light to the incident light. It is influenced by the absorption and reflection properties.

Incident ligth  100%
- Absorbtion 1%
- Reflection 5%
Total Transmittance 94%