Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: December 13, 2019

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Update on the Activities of the Long-Term Thermal Aging (LTTA) Forum

2. Discussion of Study Results of Small Flame Bar Design for Thickness Under 0.4 mm for UL 94 Testing

3. Final Classification When Testing UL 94V or 5V in UL 94 (PROPOSAL)

4. Clarification for HB Test in UL 94

5. Clamp Design for Vertical Flame Test Specified in UL 94

6. Interpretation of Paragraph 7.1.3 of UL 94 for Testing Thicknesses Less Than 3.0 mm

7. UL 94 Foam Material Testing (HBF/HF-1/HF-2): Inclusion of Density Value in Section 12 (PROPOSAL)

8. BPT Test Revision in UL 746A Polymer Variation Program (Table 9.2) (PROPOSAL)

9. UL 746A, Section 21 - AC Dielectric Breakdown Voltage and Strength. Indicate the choice of test medium (Oil)

10. Usage of a Statistical Comparison Approach as an Alternative Under the UL 746A Polymer Variation Program

11. Test Program for Metallic Pigment in Polymer Variation in UL 746A

12. Revision to Code A in UL 746A Polymer Variation Section to Accommodate Materials Showing Reverse Trend

13. Inclusion of Requirements for CTI Testing on Textured Surfaces Induced by Additive Manufacturing Process in UL 746A

14. Temperature Index TI based on IEC 60216-3 for UL 746B (PROPOSAL)

15. Inclusion of a Weathering Test Program for Non-Enclosure/Elastomeric/Film Materials in UL 746C (PROPOSAL)

16. UL 746C - Clarification of Section 25 with Respect to Choice of Impact Test Method

17. Usage of TI for the Preselection of Polymeric Materials in UL 746C

18. Consideration of Review and Possible Revision of Guidelines for Regrind and Recycled Materials in UL 746D

19. CTI Voltage Rating Greater Than 600 Volts

20. Additive Manufacturing (3D Printers)

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: July 27, 2018

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Update on the Activities of the Long-Term Thermal Aging (LTTA) Forum

2. Proposal for Alternate Flame Bar Design for Thickness Below 0.4 mm for UL 94

3. Changing the Calibration of the Flame for UL 94

4. UL 746B: TI Based on IEC 60216 - An Alternative for RTI?

5. Discussion of Status of Proposal for UL 746B Titled Revision of Paragraph 19.14 to Update Default Correlation Time for RTI Determination from 100,000 Hours to 60,000 Hours

6. Revision of Lab Environment Conditions for Comparative Tracking Index (CTI) Tests in UL 746A (PROPOSAL)

7. Simplify the RTI Testing Requirement During Addition/Deletion of Colorants (UL 746A)

8. Accelerated Heat Aging Evaluation by Thermal Analytical Tools in Accordance with IEC TS 60216-7-1 (746B)

9. UL 746C: Consideration of Hygroscopic Materials in UV Light Exposure and Water Immersion Test (PROPOSAL)

10. Revision of Paragraph 10.2.6 of UL 746D With Respect to Relative Thermal Index (RTI) Assignment for Recycled Plastics with Consistent Identification (PROPOSAL)

11. Discussion of "All Color” Testing for the Comparative Tracking Index (CTI) and Proof Tracking Index (PTI) Tests

12. Historical Information on UL Standards Documents

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: April 6, 2015

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Inclined Plane Tracking Test (746A)

2. Fixed Temperature Evaluation for Exceptionally Durable Materials (746B)

3. Clarification Between Short Term Properties (UL746A) and Long Term Properties (UL746B) within Table 9.1 (746A)

4. Starting Test Voltage for CTI (746A)

5. Increase Generic Relative Thermal Index for PEI (746B)

6. Inclusion of UV and Water Immersion Testing in Table 9.1 for Addition, Deletion, or Change in Level of Colorant/pigment Loading (746A)

7. Clearance Gauge for 50W (20 mm) Vertical Burning Test; V-0, V-1, or V-2 (94)

8. Concentrations of UV-Stabilizer in Table 9.1 (746A)

9. Accelerated Heat Aging Evaluation by Thermal Analytical Tools In Accordance with IEC TS 60216-7-1 (746B)

10. ANSI Reaffirmation Balloting During 2015 (1694)

11. Publishing Cycles for Standards Covered Under the 746 STP

12. Improvements Being Considered for the HAI Test Method (746A)

13. HWI Test Procedures (746A)

14. How the 746 STP Evaluates Proposals for New or Higher Generic RTIs

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: October 29, 2013

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Relative humidity tolerance for sample conditioning (UL 94)

2. Relative humidity tolerance for sample conditioning (UL 746A)

3. Modify the test program codes C and F for polymer variation cases (UL 746A)

4. Specialized Analysis of Polymer Variations (UL 746A)

5. Realignment of Table 9.1 Ingredient Concentrations (746A)

6. Research results of testing polymeric materials with a DC HAI Test Procedure (UL 746A)

7. Consideration of additional test methods for polymer characterization (UL 746A)

8. Relative humidity tolerance for sample conditioning (UL 746B)

9. Oven temperature Interval selection for RTI Aging (UL 746B)

10. Revise the RTI rating Increments: Is there a better way to assign RTI's from the measured thermal index values? (746B)

11. Example calculation for Related Material (746B)

12. Generic Thermal Index of PPA (UL 746B)

13. Relative humidity tolerance for sample conditioning (746C)

14. Side-by-side test requirement for exposed and un-exposed samples after UV and water immersion test (746C)

15. Consideration of ways to reduce the possibility of field incidents relating to arc tracking (746C)

16. Density reduction using MuCell process beyond that specified in UL 746D, Exception 2 of 5.1 - Blowing Agents

17. Upcoming ANSI Reaffirmation for UL 1692

18. Continuing Certification

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: April 18, 2012

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Revisions to Horizontal Burning Foamed Material Test (UL 94)

2. Color Tests of Specimens (UL 94)

3. Burning Up to the Holding Clamp (UL 94)

4. Specific Reference to ASTM E 162-08 (Radiant Panel) in UL 94

5. Assigning HB Ratings for Range of Thicknesses Based on Testing of Minimum Thickness (UL 94)

6. Dielectric Strength of Polymers Subjected to DC Voltage (UL 746A)

7. Ramp Rate of AC Voltage Dielectric Strength of Polymers (UL746A)

8. Clarification of Offset Rules for RTI Impact (UL 746B)

9. Update on Topics 11 and 12 from April 2011 STP Meeting (746B)

10. Update on Topic 13 from April 2011 STP Meeting (746B)

11. Conditioning After UV Exposure (UL 746C)

12. Recycled Plastics - Definition of Testing and Clarification of Quality Program Requirements (UL 746D)

13. Research results of testing polymeric materials with a DC HAI Test Procedure (UL 746A)

14. Upper Aging Limit for Fixed Temperature Method (746B)

15. Proposed Revision for the 12-mm Flame Test in 15.1 of UL 746C

16. Polymeric Materials in Applications with >25% Regrind Content (UL 746A)

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: May 2, 2011

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Polymeric Materials:

1. Harmonization of VTM Test Specimen Dimensional Requirements in UL 94

2. Harmonization of Conditioning Time and Temperature (UL 94)

3. Clarification of the VTM Test Procedure in UL 94

4. Harmonization of Gas Supply in UL 94

5. Editorial Revisions for UL 94

6. Clarification of UL 746C Tolerances

7. Update of Supplement SB in UL 94

8. Multiple Inputs for Polymer Variations in UL 746A

9. Voltage Ramp-Rate for Dielectric Strength and Methods to Evaluate Thin Films (UL 746A)

10. Evaluation of Films in Accordance with UL 746F (UL 746A)

11. Updating LTTA Sample Requirements in Table 20.3 of UL 746B

12. Clarification on Generic Ratings for PET, PPO (PPE) and PEI in Table 7.1 of UL 746B

13. Clarification of Requirements for Flame as a Secondary Property (UL 746B)

14. Editorial and Harmonization Revisions for UL 746C

15. Recycled Plastics - Definition of Testing and Clarification of Quality Program Requirements (UL 746D)

16. Impact Testing on Soft Materials (UL 746B and UL 746C)

17. Polymeric Materials in Applications with >25% Regrind Content (746A)

18. Rate of Oven Ventilation for UL 746B Thermal Aging Programs

19. Flammability Testing for F1 Ratings (746C)

20 . Polymeric Material Variation - Request for Clarification (746A)

21. Editorial Revisions for UL 746A

22. Clarification of HAI Electrodes Contact Point (746A)

23. Crucible for Ash Content Determination - Harmonization with ISO Method (746A)

Subject 746A (94, 746B, 746C, 746D, 1692, 1694)

Bulletin Dated: April 30, 2008

SUMMARY OF TOPICS

The following topics were discussed at the meeting:

1. Possible clarifications to the 5V test method (UL 94)

2. Possible clarification of the VTM Test (UL 94)

3. Compatibility of the material requirements in application standards such as UL 1977 with the testing samples as currently defined in UL 94 and 746

4. Secondary Property flame testing (UL 746B)

5. Selection of oven temperatures (UL 746B)

6. Clarification of the terms Absolute, Normalized, Full Testing, and Critical Properties (746A)

7. Clause 8.9 - Polymer variations - ranges of materials (UL 746A)

8. Polymer Variations - Revision of Table 19.1 (UL 746B)

9. Revised requirements for HB flame testing under material variation program (UL 746B)

10. Regarding the RTI temperature (UL 746B)

11. Gas flow rates for test flames (UL 94 and UL 746C)

12. GWEPT - GWFI requirements (UL 746C)

13. Glow-wire end-product test (GWEPT) paragraph 12.3.1 (746C)

14. Glow wire testing for materials adjacent to connections (UL 746C)

15. Go and No-Go Gauges for flammability samples (UL 94)

16. Section 8.9.2 - Define "Comparable" for Relevant Tests (746A)

17. Polymer Variation Consistency - UL746A Document versus Online Polymer Variation Tool (746A)

18. Natural Color (NC) Specimen Requirement for Color-Sensitive Tests (All Color Recognition)(746A)

19. Requirements for ReUse of Polymeric Material (746D)

20. ANSI Reaffirmation of UL 746D

21. Clarification of Ball Pressure Test (UL 746A)

22. Offset Principle for Impact Testing (UL 746B and UL 746C)

23. Comparative Tracking Index (CTI) Requirements (UL 746C and UL 746A)

24. Definition of End Point (UL 746B)

25. Oven Overlapping (UL 746B)

26. Data Points to Confirm the Property End Point (UL 746B)

27. Correlation Times (UL 746B)

28. Related Materials - RTIs (UL 746B)

29. Proposed Revision of Laboratory Atmosphere Requirements (UL 94)

30. UL 94 Editorial correction (UL 94)

31. Long Term Thermal Aging (LTTA) Ovens (UL 746B)

32. Gardner Impact Test (UL 746C)

33. Glow-Wire Tests (746A)

34. (Added Discussion item): Pollution Degree Guidelines for Relay Switches

35. (Added Discussion item): Increase the Generic Thermal Index of Polyimide Film from 130�C to 200�C

36. (Added Discussion item): Revise Requirements for Test Ovens in UL 746B

37. (Added Discussion item): Revise HAI and HWI Requirements in Table 6.1 of UL 746C for VTM Rated Materials

Subjects 746 (746A, 746B, 746C, 746D, 94, 1694)

Bulletin Dated: August 8, 2003

The following topics were discussed at the meeting:

SUMMARY OF TOPICS

This bulletin contains descriptions of the outcome of the May 8, 2003 meeting of the 746 STP. This bulletin contains a wide assortment of proposals for UL 746A, UL 746C, UL 746D, UL 94, and UL 1694, with most of them being editorial in nature.

A detailed list of discussion topics is shown below.

1) Harmonization Activities in ASTM D.09 and D.20, IEC TC15, TC61 and TC89, and ISO TC61

2) Revision of Table 8.1 in UL 746A and 19.1 in UL 746B

3) Requirements for Reuse of Plastics - UL 746D

4) 42 Volt Automotive Battery Applications

5) Minimum Thickness Issues for RTIs - 746B and 746C

6) Density Variations

7) Clarification of VTM Tests in UL 94

8) Clarification of End-Product Flammability Tests in UL 746C

9) Guidelines for IR, TGA, and DSC Evaluations in UL 746A

10) Mandatory/Permissive Language in UL 94

11) Consideration of Revision Cycles

12) Consideration of Revision to Examples in Figure 8.1 of UL 746C

13) Alignment of Mechanical Property Tests in UL 746B and UL 746C

14) Editorial Revisions for UL 1694

15) Editorial Revisions for UL 746A

16) Editorial Revisions for UL 746C

17) Editorial Revisions for UL 746D

18) DMA as a Method For Evaluating Performance At Temperature

19) Additional Ratings on Plastics Recognition Cards

20) Creation of an Insulating Systems Database

21) Elimination of Categories PHDL2 and QMFZ8

22) Testing Required for Additional Manufacturing Locations

23) IQ Database for Plastics and Food Contact Plastics

24) Reminder that UL 746C Revisions Become Effective June 1, 2004

25) UL 94 Tests Not Applicable To Building Materials

26) Pre-Selection Tests For Use In Switch Evaluation Program

27) Restricted Substances