后入到高潮免费观看-性饥渴艳妇性色生活片在线播放-亚洲av中文无码字幕色最新-漂亮人妻洗澡被公强

Patent

Independent R&D and innovation is Shihua's foundation. Shihua has accumulated a number of core independent technologies in polymerization, polymer modification, structure design, formula design, process design and manufacturing.

As of June 30, 2022, Shihua and its subsidiaries have 78 authorized patents in total, including 42 invention patents and 36 utility model patents.

• 78

  AUTHORIZED PATENTS

• 42

  INVENTION PATENTS

• 36

  UTILITY MODEL PATENTS