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Chemical compatibility of high performance engineering thermoplastics in compressor environments.

Number: pap. 2669

Author(s) : PAI-PARANJAPE V., ZIEGLER C.

Summary

The compressor industry faces a difficult design environment for achieving performance improvement, reduced cost, and lower environmental footprint. In order to address some of these challenges, thermoplastics can be considered as a replacement for metal in some compressor parts. Thermoplastics have been found to be suitable for steel replacement in structural parts for automotive and brass replacement in water-handling applications such as meters. As such, we believe certain high-performance engineering thermoplastics might be suitable candidates for metal replacement in various compressor parts. Herein, several commercial thermoplastic resins were tested for chemical compatibility to common compressor lubricants and two standard refrigerants. Chemical compatibility tests were completed under conditions comparable to those observed within compressors, inclusive of high temperature, high pressure, extended exposure time, and combinations thereof. Of the thermoplastics tested, unfilled polyetherimide resin was found to outperform competitive resins in terms of resistance to chemical attack by polyolester lubricants and R-134A and R-410A refrigerants. The protocol included visual inspection for color shift as well as the measurement of tensile strength retention for exposed parts. Gas chromatography mass spectrometry was also utilized to determine if low molecular weight species leached out of the polyetherimide resin during exposure to polyolester oils. No species were detectable with molecular weight under 1000 g/mol. Chemical resistance screening is ongoing for glass filled thermoplastic offsets and additional validation testing is planned.

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Pages: 9 p.

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Details

  • Original title: Chemical compatibility of high performance engineering thermoplastics in compressor environments.
  • Record ID : 30013523
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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