UV Block Rate: Percentage of harmful ultraviolet rays hindered or absorbed by it; better plant protection means higher block rates.
Thickness: Generally ranging from 6 mils-14 mils (polyethylene), thicker films will be more durable with better UV qualities at the expense of light transmittance;
Light Transmission Rate: This parameter shows how much visible light enters through the film in percentages; for optimum plant growth, this should range between 85% and 90%.
Temperature Resistance is the film's ability to withstand fluctuating temperatures without losing its structural integrity. It is often rated between -40°F and 180°F.
Warranty Period: In some cases, quality UV-resistant films have an extended warranty ranging from 3-10 years to boost the grower's confidence in product lifespan and performance.