Chemical-Etch Stencil is used for step stencil, During this process, a template material such as stainless steel is chemically etched thinner in selected areas. All areas that will not be thinned (or etched) are covered with a protective film. Chemical etching is a less accurate process, but it is very fast. The problem is the cost, which frankly is a mess. By nature (and by law) chemicals must be carefully managed and handled properly, which can be very expensive for manufacturers.   In general the chemical-Etch stencil: • Advantages: one-time formation; relatively high manufacturing speed; • Disadvantages: Cost is not systematized caused some are high; Trends to form sand clock shape or large openings; Numerous manufacturing stages and accumulating errors; Unsuitable for fine pitch stencils; bad for environmental protection. Not easy to handled after using.