Smoke Damage >> Cigarette Smoke Cleaning

The test procedure is to place the sample in the cuvette and place the cuvette in the quartz tube so that the first 100 mm (3.9 in) is in the exposure zone of the furnace. Using room air, Cigarette Smoke Cleaning a flow through the tube of at 100 L/h 5 L/h is established. The furnace is set at 600 C 20 C using the calibration curve previously determined with the reference body. 

The furnace then travels at 10 mm/min 0.5 mm/min until it reaches the other end of the test sample, Cigarette Smoke Cleaning which should take 30 minutes.With in 5 minutes of the end of the test the test probe is to be placed in an environmental chamber at a constant 23 C 2 C and 75 % 5 % relative humidity. Resistance measurements are made at one hour and 24 hours after the start of the test and are reported using the same calculation as the CNET tests.

By using a fire model of assisted opposed flow flame spread, the traveling furnace does not model flame spread typical of real fire scenarios, but it is likely a more reproducible fire environment. Ideally, Cigarette Smoke Cleaning the test probe is exposed to a quasi-steady state flow including products from ignition through to burnout. 

Having quasi-steady state conditions for most of the 30 minutes of the dynamic part of the test should increase repeatability and Cigarette Smoke Cleaning reproducibility, which if results can be correlated with real scale fire damage allow meaningful ranking of materials.3.2.2.2.2 ASTM D5485, ISO 11907-4, Standard Test Method for Determining the Corrosive Effect of Combustion Products Using the Cone Corrosimeter

The cone corrosimeter is designed to be an attachment for the well-established fire performance test, Cigarette Smoke Cleaning the cone calorimeter. The general idea of the corrosimeter was first published in 1990 by Ryan et al. [74].The corrosimeter attaches to the cone calorimeter above the cone furnace. It starts with a metal funnel above the cone to concentrate the effluent. 

One end of a rigid, heated, stainless steel tube is placed in the upper narrow opening of the funnel with the Cigarette Smoke Cleaning opening pointed up away from the burning test specimen so that the opening doesn’t become clogged with soot. The other end of the 675 mm 75 mm tube is connected to a flexible heat-resistant tube that is 255 mm 10 mm long and connects to the exposure chamber. 

The exposure chamber is 11.2 L 0.5 L with an inlet and outlet port and Cigarette Smoke Cleaning an O-ring sealed top to allow the test probe to be placed in the chamber.The outlet port is connected to sufficient filtering to protect a pump that draws the air through the exposure chamber to be released into a hood or other exhaust handling equipment.

To test a material or Cigarette Smoke Cleaning configuration of materials requires five samples. The first two samples are run in the cone calorimeter without the corrosimeter to determine the average time to 70 % mass loss. The final three samples are burned with the corrosimeter attached. The flow through the exposure chamber is set at 4.5 L/min. 

The stainless steel tube is heated to 105 C (221 F). The flux from the cone heater is set at the desired value and Cigarette Smoke Cleaning the material is ignited. Gas from the effluent is drawn until the previously determined 70 % of expected mass loss is achieved. At this point the intake and outlet ports are closed off and the target probe’s exposure continues until an hour after the beginning of the test. 

At this point the target probe is tested to determine the change in resistance, and Cigarette Smoke Cleaning then the target probe is placed in an environmental chamber with 23 C 2 C and a relative humidity of 75 % 5 % for 24 hours, after which the change in resistance is again measured. To calculate the amount of metal, the standard directs the tester to refer to the procedure provided by the target probe’s manufacturer.

While the cone corrosimeter is defined as a dynamic test, it has aspects of both a dynamic test as well as a static test.3.2.3 Analysis of Individual Standards and Test Methods Before looking at work done in support of the standards described earlier, Cigarette Smoke Cleaning it is important to understand what is missing. The most important fact to understand about all the standards is that they only provide a rank ordering of materials. 

While it is possible to establish classification values on the results of each of the standards, Cigarette Smoke Cleaning there is currently no work that relates the standards to large-scale testing. Babrauskas and Peacock [75] argue that what makes the cone calorimeter useful for fire protection is that performance in the cone can be related to full scale burns and real fires. 

The lack of large-scale testing for corrosion implies there is not an equivalent basis for corrosion performance criteria. The best that can be done is to provide a relative ranking of material performance and Cigarette Smoke Cleaning set performance criteria that would exclude undesirable materials from selection. 

However, just because a material is relatively noncorrosive in one or all of the bench scale tests does not necessarily imply that it will exhibit similar properties in a full-scale fire.Thus, there needs to be bench- to large-scale comparisons for the data to be useful for more than relative comparisons.The Polyolefins Fire Performance Counsel (PFPC) performed a study of four test methods and Cigarette Smoke Cleaning published the results in five papers [73,76-79]. 

The first four reviewed the work on each of the test methods, the Radiant Panel, the CNET test, the modified DIN indirect test method and the cone corrosimeter. The final paper discusses and Cigarette Smoke Cleaning compares the test methods. For completeness,the 25 materials tested by the PFPC authors are included here as Appendix A.

There is little in the literature discussing indirect test methods other than simple test method descriptions. The measurement methods use well-developed wet chemistry methods. However, Saitoh and Inukai [80] used these wet chemistry methods to look at the effect of burning chlorine containing materials on the corrosion of steel and Cigarette Smoke Cleaning stainless steel plates. 

Saitoh and Inukai burned 1.0 g samples of various carpet tiles for three minutes in a quartz tube furnace set to either 550C (1022 F) or 750 C (1382 F). Airflow of 1 L/min was supplied at one end and the flow of air and effluent was bubbled through an absorbtion bottle of 0.1N NaOH to capture the HCl, and Cigarette Smoke Cleaning the production rates of HCl were determined.

Using the same furnace and procedures, identical samples were burned, but the furnace was connected to an exposure chamber where plates of steel and stainless steel were mounted in horizontal and Cigarette Smoke Cleaning vertical orientations. After a 30 minute exposure the plates were stored in an environmental chamber kept at 20 C (68 F) and relative humidity of 80 %. 

After one, two, and four weeks, the amount of corrosion was determined although all corrosion data reported is after four weeks.As can be seen in Figure 9(a) and Figure 9(b), the corrosion of the steel plate seems to be correlated with the production rate determined for each test sample even though the production rate and Cigarette Smoke Cleaning corrosion rate were generated from separate experiments.

However, the corrosion of the stainless steel plates has no clear correlation with production rates. While the data for the production rate of HCl and the corrosion of the metal were conducted separately, it is clear, at least for the steel plate, Cigarette Smoke Cleaning that the results of an indirect test can be related to corrosion, but thestainless steel test shows that the correlations don’t hold for all materials.

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