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Compression tests at temperatures up to 800 °C showed that the samples produced in 100 % CO2 have about 20 % higher yield stress compared to samples produced in Ar .
 Compression tests, temperatures, samples, CO2, yield stress, samples, Ar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 Compression tests, temperatures, samples, CO2, yield stress, samples, Ar