Advance Specialist Treatment Engineering Limited “ASTEL” has been established since Year 1981 and being one of leading specialist contractors in Hong Kong. The Company is to undertake high quality corrosion protection work in the early stage and then to expand her business into overseas markets, which include Mainland China, Taiwan, Malaysia, Indonesia, Vietnam, Qatar and Macau, etc. Since 1990, the Company has diversified her specialist work trades into waterproofing, concrete repair, flooring, external façade renovation and historic building conservation work, etc.