The PCB circuit board thickness of eleven kinds of common classification

 The PCB quality inspection standard
 A PCB board suppliers, supply was found in sheet thickness old and request far. Previously we made in the document, just specify is tolerance or negative tolerance or in a few tenths of range. But inevitably feel special, so the Internet search, found below the corresponding national, was found to have individual requirements is a bit special, but the supplier for the plate some wonder what standard, 0.6mm sheet forming after they reach 0.89mm. What standards? Speechless ... ...
 Know the GB standard, later developed at least bottom heart, suppliers are required to be in the right and self-confident needs to do is, ha ha. The comparison with the related to some of the more important excerpts:
In 1, PCB thickness classification:
  Thickness   deviation   deviation of coarse fine
  0.5         /             ±0.07
  0.7         ±0.15        ±0.09
  0.8         ±0.15        ±0.09
  1.0         ±0.17        ±0.11
  1.2         ±0.18        ±0.12
  1.5         ±0.20        ±0.14
  1.6         ±0.20        ±0.14

  2.0         ±0.23        ±0.15
  2.4         ±0.25        ±0.18
  3.2         ±0.30        ±0.20
  6.4         ±0.55        ±0.30
In 2, warp degrees of tolerance ( see table below )
   Board thickness tolerance ( mm ) over 0.2-1.2mm over 1.5mm
   Double panel to difference = 1% = 0.7%
   Multilayer PCB tolerance = 1% = 0.7%
3, board thickness tolerance: the thickness of plate in line with customer requirements.
 Rigid product double sided laminate thickness tolerance limits are as follows
   Board thickness tolerance of mm mm      double panel      Multilayer PCB tolerance mm
   0.2-1.0        ±0.1            ±0.1
   1.2-1.6         ±0.13           ±0.15
   2.0-2.6         ±0.18           ± 0.18
   More than 3 +          ±0.18           ±0.2
In 4, hole requirements:
 Aperture in line with the requirements of customers, the tolerance range as follows:
  Aperture of mm        PTH mm     NPTH aperture aperture tolerances Tolerances
  Less than 1.6mm       + 0.08     + 0.05
  Greater than 1.6mm    + 0.1      + 0.05
Note: holes shall meet the requirements in drawings.