EU Trademark Classification EU01 Chemicals Caustic soda (sodium hydroxide) Class 01 Caustic soda (sodium hydroxide) 1574 烧碱（氢氧化钠） Chinese 烧碱（氢氧化钠） English Caustic soda (sodium hydroxide) Site ref. 1574 Class 01 Included in Harmonised Database (HDB), TM5 ID List