what is the differenced with the modify materail and virgin material?

what is the differenced with the modify materail and virgin material?

what is the differenced with the modify materail and virgin material?  Do you know? 

Such as :

color: Virgin HDPE material usually have light color, Modify color more deep

quality: Virgin HDPE material more ductile, But modify material also with 3 years warranty at least

cold storage : Virgin HDPE material can suitable for -50 temperature.  Modify HDPE material suggest not lower than -20 temperature.