149 a:4:{s:8:"template";a:1:{s:27:"Work Instruction-print.html";b:1;}s:9:"timestamp";i:1369718603;s:7:"expires";i:1369722203;s:13:"cache_serials";a:0:{}}WI 5012 - Visual Defect Standard


Created Modified Rev. Changed by Change
08/09/05 08/11/05 1 Mathias Document System Change



The following is the definition of conformance visual standards for PTFE seals including lip-type seals, rectangular cross-section seals, and jointed cross-section seals.

This instruction applies for finished parts only

Inspection Standards:
ABurrs or "Chatter"
1Sealing surfaces (excluding edges) shall be free from burrs or chatter.
2On non-sealing surfaces or any edge, the length of any burrs or chatter must not exceed .25 mm when fully extended from the surface
BNicks and Deformations
1No nicks or unrecoverable deformations are allowed on a sealing surface. A deformation is "recoverable" if it is no longer visible after heating for one hour at 177 +/- 8o C.
2Recoverable deformations on non-sealing surfaces only are allowed to a depth of .25 mm
CVoids and Impurities
1No impurities will be allowed on any functional or sealing surface
2On non-sealing surfaces, impurities imbedded in material are acceptable to lengths of up to 1.5 mm in any surface direction.
3Voids or impurities shall not permeate the cross section of the part

 

NOTE

 

All non-conforming parts must be cut