Heat resistance tests

ISO 188, Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests (available in English only), 1998. 

Spore bioburden data are collected to screen for heat-resistant organisms. Organisms surviving heat-resistance testing are to be submitted to the terminal sterilization laboratory for D-value analysis. D-values are then compared to established models for the component sterilization process. 

Accelerated aging or heat resistance tests Heat resistance and accelerated air aging test... 

It is kept at room temperature for 2.5 hoxirs and the linter is then nitrated to the nitrocellulose. The required nitrogen content is obtained by adjusting the water content in the mixed acid for example, about 17.5% H j,0 is adequate to obtain 12% N. The nitrated linter is separated from the mixed acid. It is washed with water and boiled in a 0.01% Naa/CO solution in water for about two days renewing the solution several times in order to remove traces of acid. Lastly ii is beaten in water with a beater to form fine particles and finally washed with hot water until it passes a heat resistance test. 

ISO 188 1998 Rubber, vulcanised—Accelerated ageing or heat resistance tests. 

Table 3.23 gives the surface compositions of AllO catalyst before and after the reduction as well as after the heat-resisting tests, which were obtained by the electron energy spectra (AES) and XPS (probing depth of 2 x 10 m). Before reduction, the number of iron atoms on the surface is only 5.4%, while the atomic compositions of the promoters are less than 10% in the bulk. However, on surface, the concentrations of promoters are above 50% no matter before or after reduction, or after the heat-resisting tests. It is clearly indicated that the phenomenon of surface segregation or surface enrichment of the promoters is commonly present and comparatively serious for fused-iron catalysts of ammonia synthesis. The surface states of catalysts are not only decided by their chemical composition and preparation method, but also connected with the reduction and use conditions. 

Table 4-4 gives results of heat resistance tests performed in various thermoplastics at 0.5 % pigmentation levels. Samples were obtained by injection molding at increasing temperatures with 5 min dwell time. The temperatures reported correspond to that at which an appreciable color change (DE of 3) is observed. 

ISO 188 2011 Rubber, Vulcanized or Thermoplastic. Accelerated Ageing and Heat Resistance Tests. 

Three basic tests have been developed and accepted by the plastics industry. If the application does not require the product to be exposed to elevated temperature for a long period under continuous load, a simple heat-resistance test is adequate. The applications requiring the product to be under continuous significant load must be looked at from creep modulus and creep rupture strength test data. Another widely accepted method of measuring maximum continuous use temperature has been developed by Underwriters Laboratories. The UL temperature index, established for a variety of plastic materials to be used in electrical applications, is the... 

A. Long-Term Heat-Resistance Test (ASTM D 794)... 

The long-term heat-resistance test was developed to determine the permanent effect of heat on any property by selection of an appropriate test method and specimen. In ASTM recommended practice, only the procedure for heat exposure is specified and not the test method or specimen. 

Heat resistance test at 100 °C - Sentinel heat seal tester Set-up a Sentinel heat sealer according to heat pressure and time interval specified. A one by three inch (2.5 cm X 7.5 cm) print sample is folded ink surface-to-ink surface and placed between the sealer bars. The heat sealer is operated. After the sample has been cooled, the sheets are separated and a subjective comparison is made for cling, ink transfer and picking. The jxjlymer glass transition temperature (Tg), molecular weight, and surface compatibility affect heat resistance. 

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