Impact J / m

100.0

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

PA 6,6

With UL-94 V0 , GFR PA 6,6 , the methodology employed was based on five cycles of concomitant injection moulding and mechanical recycling . The first cycle involved freshly compounded material , while the following four cycles were performed by mixing 50 % of the initial , fresh compound with 50 % recycled material from the previous cycle . Six 30 % GFR PA 6,6 formulations were tested : 1 . No FR 2 . Brominated polystyrene & antimony trioxide ( ATO ) as synergist

3 . Brominated polystyrene & alternative synergist , ATO-free

4 . High molecular weight ( MW ) brominated epoxy & ATO as synergist

5 . High MW brominated & alternative synergist , ATO-free

6 . Diethyl phosphinate aluminum ( DEPAL ) FR

0.0

Reference

1 Round round1 2 Round round 2 3 Round round3

4 Round round4

Recycling

Figure 2 – Recycling performance of different flame retardant systems for 30 % GFR PBT : Impact strength ( a ) & tensile strength ( b )