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Data from 2017 to Dec. 14 2018 shows that there is a trend increase from the Coefficient of Thermal (CTE) from the Ceramics filter product from a company A and this makes a decrease in the meting point value of the Ceramic filter product which has approached the customer min spec (≥ 650 oC). A CTE value is needed that can be used as a standard to ensure the melting point value does not come out of the customer spec value. By using the correlation method a minimum CTE value will be used as a standard to guarantee the quality of the Ceramics filter from company A