{
  "abstract": "Saturated vapor pressures of octafluorocyclobutane (c-C4F8, RC-318) were measured at 32 temperatures from 234.33 K to 387.01 K, corresponding to pressures from 20.62 kPa to 2.698 MPa. Measurements were performed in a variable-volume cell with sapphire windows, enabling direct observation of the vapor–liquid meniscus and visual confirmation of the two-phase state at each point. The highest measurement was obtained 1.36 K below the reported critical temperature (Tc = 388.37 K). Temperature was measured with a platinum resistance thermometer traceable to the ITS-90, and pressure was measured with a calibrated transducer. The combined expanded uncertainty in the saturation pressure, U(ps) (k = 2), was estimated to be 0.2–0.6% over the measured range. The data were correlated with a four-term Wagner equation constrained to the critical parameters of Douslin et al.,[3] giving an average absolute relative deviation (AARD) of 0.23%, a root-mean-square relative deviation of 0.34%, and a maximum absolute relative deviation of 0.82%. The measurements agree with the reference equation of state of Platzer et al.[28] with an AARD of 0.27%. Combined with saturated-phase molar volumes from the reference equation of state, the correlation gives an enthalpy of vaporization that decreases from about 25.4 kJ·mol−1 at 234 K, through 23.3 kJ·mol−1 at the normal boiling point, and approaches zero at the critical point. These measurements provide a modern, internally consistent vapor-pressure data set for a high-GWP fluorinated gas that is widely used in semiconductor processing and has also been investigated for dielectric applications.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "name": "Jae Uk Yoon"
    },
    {
      "name": "Jin Woo Bae",
      "orcid": "0000-0001-7166-9201"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7kyp51xg20ccm.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009592/v1",
  "fulltext_url": null,
  "id": "7kyp51xg20ccm",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009592/v1",
  "language": null,
  "licence": "CC-BY-NC-ND",
  "licence_label": "CC BY-NC-ND",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2204|Phase Equilibria and Thermodynamics"
    ]
  ],
  "openalex": "W7214720130",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009592/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/7kyp51xg20ccm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "10.26434/chemrxiv.15009592",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009592/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Vapor Pressure of Octafluorocyclobutane (RC-318) from 234 K to 387 K Measured with a Variable-Volume View Cell",
  "title_text": "Vapor Pressure of Octafluorocyclobutane (RC-318) from 234 K to 387 K Measured with a Variable-Volume View Cell",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/7kyp51xg20ccm",
  "venue": "ChemRxiv",
  "versions": []
}