1. EP: A treatment method of metal surface, Electropolishing treatment.

2. Ra or Rz: The evaluation parameter for surface roughness, usually based on μ M is the unit.

3. Metal ion precipitation: In certain specific links of the semiconductor industry, the precipitation of metals and ions in various pipeline fittings must be below the industry standard values. The main products involved are PFA pipe fittings, PVDF pipe fittings, etc.

4. VCR: The registered trademark of Metal Gasket Face Seal Fitting from Swagelok Company in the United States, which has now become synonymous with metal face seal fittings.

5. HP and SH after PFA raw materials: represent high purity materials, such as DuPont 951HP/451HP, Daikin 231SH/211SH, 3M 6502UHPZ, etc

6. Adapter: Generally refers to a conversion fitting, such as a flange adapter (one end flange, one end expansion or bead insertion)

7. Sleeve: Bead insertion, a connection sealing method for PFA fittings, also referring to individual bead insertion accessories

8. Parflare, Male Flare: A connection method for flared and PFA connectors

9. Redi flare, Female Flare, Space saver: Space saving connectors, or directly referred to as female connectors, can be directly connected to the expansion or bead end without a nut, thus saving space and being highly favored in semiconductor applications with extremely high space requirements.