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)

Bulletin Dated: July 20, 2017

SUMMARY OF TOPICS

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

1. Setting 1/64 inch (0.4 mm) as the Minimum Thickness Limit to Represent Thinner Thickness for the Vertical Flammability Test Evaluation for UL 94

2. Using 10 Samples Instead of 5 Samples Per Set for the UL 94 and UL 746A Flame Test

3. Update on the Development of a Proposal to Include the Arc-Resistance-to-Ignition (ARI) Test in UL 746A

4. Update on the Development of a DC Hot-Wire Ignition (HWI) Test for UL 746A

5. Update on Microscale Combustion Calorimetry (MCC) Testing for UL 746A

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

7. Status of the Proposal for Handling Low Correlation Times for UL 746B

8. Update on the Development of a New Test Method for UL 746C for Evaluating Plastic Parts Made by 3D Printing Technology

9. Status of the Proposal for UL 746C for the Inclusion of Elongation as Part of (f1) and (LTTA) Investigation

10. Discussion of RTI/Schneider's Concerns About the Low Correlation Time

11. Delete Regrind Requirements in UL 746D; Include UL 746A reference in UL 746D for Regrind Program

12. Reuse of Powder in 3D Printing - Similarities with Regrind Program

13. Comment Resolution for the April 12, 2017 CSDS Preliminary Review Work Area for UL 746B

14. Discussion of Outdoor Programs for Hygroscopic Materials (PA)

15. Suggestion for Accessibility to STP Members of Historical Information on Proposals for UL Standards

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 746R (94, 746A, 746B, 746C, 746D)

Bulletin Dated: December 10, 2014

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for Restricted Use Substances in Polymeric Materials, UL 746R

Subject 746H (94, 746A, 746B, 746C, 746D)

Bulletin Dated: November 25, 2014

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for Non-Halogenated Materials, UL 746H

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