Recycling of SUMIKAEXCEL PES

When mixing virgin pellets with recycled pellets, the mixing ratio must be adjusted depending on the grade and application. The mixing ratio of each grade of recycled pellets is shown in Table 4-4-1.

Table 4-4-1 Recommended mixing ratio of recycled pellets

Grade Percentage of recycled pellets (%)
4100G/4800G Under 30
3601GL20 / 4101GL20 Under 20
3601GL30 / 4101GL30 10 or less

For non-reinforced grades, excessive use of recycled pellets may cause the product to become more colored and brittle. For glass fiber reinforced grades, the glass fiber length shortens during recycling, causing a decrease in mechanical strength, so the mixing ratio is limited. Table 4-4-2 shows the relationship between the recycled use ratio (number of times recycled) and the change in tensile properties for each grade.

Table 4-4-2 Recycled material ratio and tensile properties of non-reinforced and glass fiber reinforced grades

Grade 4100G/4800G 3601GL20 / 4101GL20
Recycled pellet ratio (%) 30 100 30 100
Physical properties Tensile strength
(MPa)		 Mode of destruction Tensile strength
(MPa)		 Mode of destruction Tensile strength
(MPa)		 Tensile strength
(MPa)
Playback repeat count Virgin Material 86 Ductility 86 Ductility 126 126
1 87 Ductility 87 Ductility 126 121
2 89 Ductility 87 Ductility 125 116
3 88 Ductility 87 Ductility 126 109
4 88 Ductility 88 Ductility 124 102
5 89 Ductility 87 Ductility 122 98