raw · articles · ingested 2026-07-02
Rubitherm RT-line organic (paraffin) PCM datasheet — comfort-range grades
confidence: medium
Source: https://www.rubitherm.eu/en/productcategory/organische-pcm-rt
Source: Rubitherm Technologies GmbH product datasheets (RT organic PCM line). Credibility: Medium (vendor spec sheet — authoritative for its own product numbers).
Latent heat by grade (comfort range)
| Grade | Melt °C | Storage kJ/kg |
|---|---|---|
| RT18 HC | 18 | 260 |
| RT21 / RT21 HC | 21 | 165 / 190 |
| RT22 HC | 22 | 190 |
| RT24 HC | 24 | 200 |
| RT25 / RT25 HC | 25 | 180 / 230 |
| RT28 HC | 28 | 250 |
- “HC” grades carry 25–30% more latent heat than classic grades and melt in a narrower band.
- RT21HC is the most-studied glazing PCM (see Heim 2021).
- These are the melt-temperature/latent-heat anchors that transmittance papers reference by name.