This is a product of Goodfellow. The material is not tested for transparancy or transmittance. However the manufacturer suggests the publication below may helpful.
[Bhuyar, Prakash, et al. "Effect of ultraviolet light on the degradation of low-density and high-density polyethylene characterized by the weight loss and FTIR." Maejo International Journal of Energy and Environmental Communication 1.2 (2019): 26-31.]
The image below was provided in the above cited paper.
