Academic journal article Forensic Science Communications

Chapter 14: Manufactured Fiber Examination-Thermal Microscopy

Academic journal article Forensic Science Communications

Chapter 14: Manufactured Fiber Examination-Thermal Microscopy

Article excerpt

General Discussion

This module is intended to familiarize the trainee with the use of a polarized light microscope equipped with a hot stage to observe the effect of heat on thermoplastic fibers and to determine fiber melting point. The trainee should be aware of the applicability and the judicious use of this destructive technique.

Objectives

Upon satisfactory completion of this training module the trainee will have developed and demonstrated theoretical knowledge and/or practical skills to:

1. set up, operate and calibrate a hot stage;

2. use the hot stage for melting point determinations and observe reactivity (e.g. softening, charring, melting, etc.);

3. identify those situations in which thermal microscopy is appropriate;

4. obtain melting point values from reference materials and the literature; and

5. understand alternative methods of melting point determination.

Training Steps and Check Lists

1. Reading Assignments: Complete Chapter 14 reading assignments listed in Appendix I.

2. Basic Skills

3. Practical Exercise: Complete this exercise located in Appendix II.

14-1 Use of a Hot Stage

Part 1 Determining Melting Range of a Manufactured Fiber Part 2 Identifying and Discriminating Nylon 6 and 6,6 by Melting Points Part 3 Comparing Fibers by Melting Points

Competency Evaluation

The trainee shall be evaluated by quizzes on theoretical knowledge and basic practical skills as specified in the module objectives. …

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