F/R polyester filament fiber is made of phosphorus F/R polyester chips through melt spinning. Products include F/R polyester DTY and from 75d~300d /48f~192f. Products are featured for their stable quality and low denier difference, high intensity and even dyeing. Quality standard parameters shown in following table: Name A+ Level A Level Denier variation % ± 2.50 3.00 Linear density variation % ≤ 0.90 1.50 Breaking extension ( %) ±3.0 ±5.0 Breaking extension CV (%) ≤ 9.00 13.0 Breaking strength cN/dtex ≥ 3.30 3.00 Breaking strength CV (%) ≤ 6.00 9.00 Curl shrinkage content % ±3.0 ±4.0 Curl shrinkage CV (%) ≤ 7.0 15.0 Curl stability degree % 65.0 45.0 Shrinkage in boiled water (%) ≤ ±0.5 ±0.8 dye uniformity (grey card) grade ≥ 4.0 4.0 Oil content % ±0.8 ±1.0 entangling-degree (points /m) ±10 ±15 entangling-degree CV (%) ≤ 8.0 Note: 1. F/R polyester DTY is tested according to GB/T14460-2001. 2.P content of the F/R polyester filament fiber can be adjusted by customer's requirements.