These formulas are the biggest secrets that the company has, notes Tony Li, and only three people in the entire company know what they are. In order to keep them from being exposed, the company hasn't even applied for patents. The second hurdle is accuracy, which here also means stability.
李棟樑不諱言，材料配方是公司的最高機密，全公司上下知道的人不超過三位；為了防止配方外洩，連申請專利的權利都必須放棄。