Different (1) the proportion of fiber content and properties of various plastics, and therefore they are the most appropriate fiber content is different. Content is too high, the fibers in the molding severe abrasion. But lead to enhanced weakened; content is too low, the tensile strength of the products and notched impact strength declined. (2) the fiber diameter is generally believed that the finer the glass diameter, the same content of fiber reinforced effect is more significant. But in the actual production of products, the difference was not significant. (3) glass fiber length steel sections to ensure a uniform distribution of the fibers, generally the longer the fiber, the better the product. When the fiber length is less than o. When 04mm, fiber reinforcement can not afford. Injection molded articles, fibers and pellets typically 0.2-0.6mm. However, excessively long fiber pellets material fluidity, leading to molding difficulties. (4) fiber products glass fiber dispersion glass steel sections in the more evenly dispersed, mechanical strength and heat resistance, the better, but the better to improve the elastic modulus. Source: "FRP profiles of performance parameters" www.jinglong2008.com/news/7.html details, see [ZQ]