The following changes in requirements to the Standard for Printed Wiring Boards, UL 796, are being proposed for preliminary review and comment only:
1. For Preliminary Review Only: Revision to and Addition of Terms in Glossary, Section 2
2. For Preliminary Review Only: Clarification of Requirements for Standard Atmospheric Test Conditions in Paragraph 4.2
3. For Preliminary Review Only: Clarification of Requirements for Acceptability of Printed Wiring Boards in Section 7.1
4. For Preliminary Review Only: Clarification of Requirements Regarding Base Material Relative Thermal Index (RTI) in Paragraph 9.1.3
5. For Preliminary Review Only: Clarification of Requirements for Base Material Sample Thickness Tolerances in Table 9.2
6. For Preliminary Review Only: Addition of Paragraph 9.1.7 for Requirements for the Condition of "As-Received Samples"
7. For Preliminary Review Only: Clarification of Requirements for Metal-Clad Base Material in Section 9.2
8. For Preliminary Review Only: Clarification of Requirements for Conductors in Paragraphs 10.2.1 and 10.6.1
9. For Preliminary Review Only: Modification of Thickness of Edge Conductor in Figure 10.1
10. For Preliminary Review Only: Clarification of Requirements for Plated Contact Fingers in Section 10.9
11. For Preliminary Review Only: Clarification of Requirements for Multi-site Processing in Paragraph 12.2.1
12. For Preliminary Review Only: Clarification of Requirements for Permanent Coatings in Section 13.1
13. For Preliminary Review Only: Addition of Figures in Section 14 to Illustrate Requirements for Plugged-Hole Materials
14. For Preliminary Review Only: Clarification of Requirements for Dissimilar Dielectric Material Bond Strength in Paragraph 17.6.1
15. For Preliminary Review Only: Clarification of Requirements for the Evaluation of Metal Base Printed Wiring Boards in Section 17A.1
16. For Preliminary Review Only: Clarification of Requirements for Maximum Internal Copper Test Program in Paragraph 20.6
17. For Preliminary Review Only: Clarification of Requirements for Conductor Measurements in Section 21
18. For Preliminary Review Only: Clarification of Requirements for Microsection Analysis in Paragraph 21A.3.3
19. For Preliminary Review Only: Clarification of Requirements for Flammability Classification in Paragraph 22A.1.2
20. For Preliminary Review Only: Clarification of Requirements for Bond Strength Temperature in Paragraph 23.3.1
21. For Preliminary Review Only: Clarification of Requirements for Thermal Cycling Scheduling in Table 27.1
22. For Preliminary Review Only: Clarification of Requirements for HDI Printed Wiring Board Constructions in Section 28
23. For Preliminary Review Only: Clarification of Requirements for Silver Migration Test in Section 30
24. For Preliminary Review Only: Clarification of Marking Requirements in Section 31