1. According to the relative use environment temperature According to GB / T10004-2008 " Plastic composite film for packaging , bag dry compounding, extrusion compounding" according to the use temperature: the product is divided into ordinary grade, boiled grade, semi-high temperature cooking grade and high temperature cooking grade according to the use temperature: Table 1 Classification table of national standard level Classification conditions Remarks Ordinary The product temperature is below 80 ℃ (including 80 ℃) Unmarked usage time Boiled grade Product temperature is above 80 ℃ ~ 100 ℃ (including 100 ℃) Unmarked usage time Semi-high temperature cooking grade Product temperature is above 100 ℃ ~ 121 ℃ (including 121 ℃) Unmarked usage time High-temperature cooking grade Product temperature is above 121 ℃ ~ 145 ℃ (including 145 ℃) Unmarked usage time 2. Foreign classification High-temperature cooking bags [the FDA called "high-temperature composites" (High Temperature Laminates)] temperature classes, foreign more consistent approach is to divide it into third gear. Table 2 Foreign classification categories level Time condition Shelf life of content 121 ℃ high temperature cooking bag Hold at 121 ℃ for 20 ~ 60min More than 6 months 135 ℃ high temperature cooking bag Keep the temperature at 135 ℃ for about 20min 1 ~ 2 years 140 ℃ super high temperature Generally only 2 ～ 5min at 140 ℃ The heating method is microwave sterilization within 2 years 3. Classification table according to temperature and time Table 3 Classification table by temperature and time level Classification conditions Remarks Boiled grade The product temperature is 100 ℃ boiling water Sterilization time 30min Medium temperature cooking grade The product's use temperature is resistant to cooking and sterilization below 121 ℃ (including 121 ℃) Sterilization time 40min High-temperature cooking grade Product use temperature is resistant to high temperature sterilization below 135 ℃ (including 135 ℃) Sterilization time 30min 4. Classification according to material structure The structure of the high temperature resistant cooking bag has two layers, three layers, four layers or more, generally classified according to the following table. Table 4 Classification table according to different layer structure category Material structure Water vapor transmission Oxygen permeability Class A BOPA / CPP, PET / CPP, PET / BOPA / CPP ≤15 ≤120 Class B BOPA / AL / CPP, PET / AL / CPP, PET / BOPA / CPP ≤1 ≤1 Category C PET / BOPA / AL / CPP, PET / AL / BOPA / CPP ≤1 ≤1  Bread Baking Pan,Bread Pan,Loaf Pan,Bread And Loaf Pans Xiongyang Household Co., Ltd , https://www.yjkitchen-manage.com