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Although this description has been shown to be successful for relatively small temperature jumps, typically close to the glass transition temperature, Tg, its validity for large jumps is a matter of open debate. Here, we implement the material time concept within the single parameter aging model with a single time scale, that is, the one of the main \u03b1 relaxation, and apply it to isothermal aging data after both temperature down- and up-temperature jumps. Our results show that a single parameter falls short of capturing the entire phenomenology of physical aging. Specifically, a single parameter can either describe aging after temperature up-jumps and relatively small down-jumps or capture the entire range of aging kinetics after temperature down-jumps while falling short of predicting aging after up-jumps. This outcome highlights the necessity of incorporating multiple time scales in the description of physical aging.<\/jats:p>","DOI":"10.1063\/5.0350659","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T10:48:06Z","timestamp":1790851686000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["On the application of single parameter aging to glass equilibration"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7729-8069","authenticated-orcid":false,"given":"Valerio","family":"Di Lisio","sequence":"first","affiliation":[{"name":"Centro de F\u00edsica de Materiales (CSIC\u2013UPV\/EHU) 1 , Paseo Manuel de Lardizabal 5, 20018 San Sebasti\u00e1n,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5782-7725","authenticated-orcid":false,"given":"Daniele","family":"Cangialosi","sequence":"additional","affiliation":[{"name":"Centro de F\u00edsica de Materiales (CSIC\u2013UPV\/EHU) 1 , Paseo Manuel de Lardizabal 5, 20018 San Sebasti\u00e1n,","place":["Spain"]},{"name":"Donostia International Physics Center 2 , Paseo Manuel de Lardizabal 4, 20018 San Sebasti\u00e1n,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,10,1]]},"reference":[{"key":"2026100509113420400_c1","volume-title":"Physical Aging in Amorphous Polymers and Other Materials","year":"1977"},{"key":"2026100509113420400_c2","doi-asserted-by":"publisher","first-page":"1952","DOI":"10.1002\/pol.20230850","article-title":"Physical aging and vitrification in polymers and other glasses: Complex behavior and size effects","volume":"62","year":"2024","journal-title":"J.\u00a0Polym. 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