Seoul — South Korea’s Samsung Electronics and SK Hynix have asked a local supplier to boost supply of a key chipmaking chemical to guard against any production disruptions, an official at the supplier said on Tuesday.

The move by the two chipmakers to secure supplies of hydrogen fluoride comes after Japan said earlier in July that it would tighten curbs on exports of high-tech materials used in smartphone displays and chips to South Korea, threatening to disrupt the global supply of microchips consumed by the likes of Apple and Huawei Technologies...

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