What Are The Benefit Of Glass Filled Granules? Glass-filled granules such as LEXAN 3412R, PC 20% GF FR, LEXAN 3412R Natural, are highly durable. #pcandgffrgranules #lexan500r #pc10%gffr #lexan503r #lexan3412r #pc20%gffr #lexan3412rnatural https://visual.ly/community/Videos/business/what-are-benefit-glass-filled-granules