Wires testing

Optical Methods for On Line Surface Wire Testing. 

Outstandingly, all the grades of at least one manufacturer pass the demanding glow wire test at 960°C at 3.2 mm. 

Wire used in the manufacture of wire rope is made from (1) acid or basic open-hearth steel, (2) basic oxygen steel, or (3) electric furnace steel. Wire tested before and after fabrication shall meet different tensile and torsional requirements as specified in Tables 4-9 and 4-10. 

Selection and testing of wire prior to rope fabrication will be adequate to ensure the after-fabrication wire rope breaking strength and wire requirements can be met. Prior to fabrication, wire tests should meet the requirements of Table 4-10. 

If, when making any individual wire test on any wire, the first specimen fails, not more than two additional specimens from the same wire shall be tested. The average of any two tests showing failure or acceptance shall be used as the value to represent the wire. The test for the rope may be terminated at any time sufficient failures have occurred to be the cause for rejection. 

During the torsion test, tension weights as shown in Table 4-13 shall be applied to the wire tested. 

How can you make a polyester and a polyamide Objectives Prepare a polyester from phthalic anhydride and ethylene glycol. Prepare a polyamide from adipoyl chloride and hexamethylenediamine. phthalic anhydride (2.0 g) sodium acetate (0.1 g) ethylene glycol (1 mL) 5% adipoyl chloride in cyclohexane (25 mL) 50% aqueous ethanol (10 mL) 5% aqueous solution of hexamethylenediamine (25 mL) 20% sodium hydroxide (NaOH) (1 mL) scissors copper wire test tube test-tube rack 10-mL graduated cylinder 50-mL graduated cylinder 150-mL beakers (2) ring stand clamp Bunsen burner striker or matches balance weighing papers (2)... 

Ignitability - (IEC 695) IEC Needle Flame and Glow Wire Tests... 

The apparatus used for the Glow-wire test, shown in Figure 1, consists of a carriage moving on a platform. The carriage holds the 3" x 3 polymer sample which is moved horizontally towards the glowing Nickel/Chromium wire which can be heated to a temperature of 660 C and 96CPC. The polymer sample is subjected to the wire for thirty seconds with a force of 1.8 to 2.0 Newtons. 

Table II. Glow Wire Tests on Engineering Structural Foam Samples with EMI Coatings...

In most commercial references to FR -PBT blends, what is really meant by FR is that the materials are ignition resistant - not impervious to fire. With limited heat sources, such as in the UL-94 test [52] or the glow wire test [53], the FR blends will resist ignition or self-extinguish a small flame. However, in a large fire, these resins will bum, usually with a smoky flame. 

Polymeric materials - short term property evaluations hot wire ignition, Underwriters Laboratory Bulletin UL-746A, Underwriters Laboratory, Northbrook, IL, 1984, pp. 24-25 (ASTM D3874-97, American Society for Testing and Materials Glow Wire Test (IEC 695-2-1), International Electrotechnical Commission). 

The importance of the heated wire test was the ability to monitor the additional variable of the temperature within the chamber. The temperature of the heated wire element was recorded for each reaction. The graph (Figure 4). displaying temperature in relation to percent hydrogen in air at atmospheric pressure, demonstrates that as the hydrogen percentage increased, the reaction occurred at a higher temperature. 

Experiment Prepare a solution of a ferrous salt by dissolving 2 grams of ferrous ammonium sulphate in 20 cc. of water, adding a little dilute sulphuric acid and a piece of iron wire. Test both this solution and a solution of a ferric salt (nitrate or chloride) with potassium ferrocyanide, potassium ferricyanide, and potassium sulphocyanate. Tabulate the results. These constitute the standard tests for ferrous and ferric salts. Write equation. 

Figure 12.4. Autoignition temperature measured by glow wire test for PP containing talc and MgiOH),. [Data from Costa L, Camino G. Bertelli (I, Borsini G, Fire Mat., 19, No.3, 1995, 133-42.]...

Thus, both wires tested have the same strength of... 

Figure 9 Schematic diagram of glow wire test (I EC 69 5 2 1)1. Test specimen. 2. Test specimen mounting.. 1. Device for applying 1 newton load. 4. Hot needle probe.

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