The contact angle and the surface tension of the relationship can be expressed as: COS 0 = 1+ C (A a B) wherein: the liquid surface tension of the liquid-gas interface A--; B_ solid surface tension solid-liquid interface; C- - constant; 0-- liquid contact angle and solid surface. In the case of the fixed liquid contact angle Dongguan Company, A is a certain value of the contact angle meter, if this is the case, then the substrate should be the same as the surface energy. Understand and master the contact angle measuring instrument for measuring surface contact angle and surface energy of the basic principles; 2. Familiar contact angle measuring instrument (Sheng Ding, model SDCA100) operating techniques; two, the experiment content 1. Master SDCA100 type contact angle measurements Miriam works and procedures; 2. Measurement medical film inorganic surface contact angle and surface energy; three, equipment laboratory instruments, equipment and materials used in this experiment was SDCA100 type contact angle measurement, testing materials for medical inorganic film or medical polymer materials. In the experiment for the test liquid used in double-distilled water, formamide. When the sample is used to clean acetone, ethanol, distilled water and a single furnace, such as a beaker. Contact angle measurement, contact angle, ShengDing instruments provided by the Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) (www.dgshengding.com) strong, credible, in Dongguan, Guangdong specialized instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead ShengDing instrument and you hand into the brilliant, for a better future!