Gas-permeable barrier films include a polyolefin and an inorganic filler dispersed in the polyolefin. Methods for forming polymeric films and articles of manufacture prepared therefrom are described.

Gas-permeable barrier films include a polyolefin and an inorganic filler dispersed in the polyolefin. Methods for forming polymeric films and articles of manufacture prepared therefrom are described.

A material of thermoplastic fusible inner mold is provided, including: a high crystalline polymeric material and a lubricant material, the high crystalline polymeric material mixed with the lubricant material. An inner mold is further provided, made of the material of thermoplastic fusible inner mold described above. A method for manufacturing hollow part is further provided, including the following steps of: providing the inner mold; covering the inner mold with a part material; heating the inner mold which is covered with the part material to form the part material; and heating the inner mold covered with the part material which is formed at a predetermined temperature to melt the inner mold out of the part material which is formed to form the hollow part.