PTFE expansion bellows
Flange: Carbon steel with zinc plated, SS304, SS316, SS316L
Support ring: SS304, SS316
Bellows: PTFE / Teflon
Standard of Flange: ANSI B16.5 or DIN16962/4

INSPECTION TESTS FOR PTFE EXPANSION BELLOWS:
1. EACH BELLOW PRIOR TO SHIPMENT SHALL BE HYDROSTATICALLY (TEST PRESSURE: 10BAR
(145PSIG. 150#) HOLDING TIME OF 3 MINUTES) AND ELECTORSTATICALLY TESTED WITH OUTPUT VOLTAGE
OF 25KV, IN ACCORDANCE WITH SEC. 7 OF ASTM F1545-2003 AND SHALL SUBSEQUENTLY BE VISUALLY 
INSPECTED FOR WORKMANSHIP AND DIMENSIONALLY CHECKED TO VERIFY CONFORMANCE TO REQUIREMENTS
OF APPLICABLE STANDARDS AND DATA SHEETS.

2. THE GASKET SEATING SURFACE OF THE LINING FOR THE PTFE EXPANSION BELLOWS SHALL BE FREE OF 
SURFACE DEFECTS THAT COULD IMPAIR SEALING EFFECTIVENESS (5.4.2 OF ASTM F1545-2003)