Technical Support & Contact

Hyosung Chemical signed a certificate of authorization on 1 January 2024 appointing Juhong as general distributor of POLYKETONE products for China, signed by Sung Kyoung Yoon, Vice President of the POK China Business Division. The original is held at our Shenzhen head office and can be inspected at any time. We also ship the original COA and a copy of the authorization with orders. For independent confirmation, Hyosung’s China office can be contacted directly.

Native grades hold FDA (FCN), EU 10/2011 including the 2020/1245 amendment, Chinese food contact standards, NSF/ANSI 51 and 61, German KTW/W270, UK WRAS BS6920, French ACS and GB/T 17219. For medical use there is also USP Class VI and ISO 10993. Whether a finished article can claim compliance also depends on masterbatch and processing — we supply the matching batch documents to support your filing.

Not as a one-to-one swap. POK is clearly better than PA66 on hydrolysis resistance, wear and gas barrier, but the processing window is narrower and its melting and crystallisation behaviour differ, so runner design and process parameters need re-evaluating. We normally recommend a small trial run before committing to a switch.

Nine times out of ten it is insufficient drying. Dry POK with hot air at 80–100°C for 3–4 hours, or use a desiccant dryer with a dew point below −20°C where available. Also check hopper sealing and the regrind ratio — damp regrind causes the same defects.

Shrinkage varies with grade, wall thickness and mould temperature, and glass-filled systems are strongly anisotropic. Start from the mid-point of the TDS range for the specific grade and correct after trials. For dimension-critical parts, prefer low-crystalline or mineral-filled grades.

Native POK grades already carry FDA, EU 10/2011, KTW/W270 and similar base certifications. Whether the finished article can claim compliance also depends on additives, masterbatch and processing. We provide the original compliance documents for the batch to support your end-product filing.

Native resin is ordered in full bags; modified grades can be supplied as kilogram-scale samples, with production batches typically in 25 kg bags. Stocked grades ship from our Shenzhen and Dongguan warehouses; for others lead time depends on the production schedule — please confirm with sales.

Yes. We run our own compounding line. Typical custom work covers glass or carbon fibre loading, wear packages (silicone, PTFE, molybdenum disulphide), flame retardant rating, toughening and colour matching. Minimum quantity depends on formula complexity.