Quick answer: Daphne FVC68D and Daphne FVC32D are two grades of the same polyvinyl ether (PVE) refrigeration oil family, published by Idemitsu Kosan under the DAPHNE HERMETIC OIL name for HFC compressors. The measured difference is viscosity, and it is wide. FVC68D runs at 66.57 mm²/s at 40 °C, which places it in the ISO VG 68 band, while FVC32D runs at 32.40 mm²/s, in the ISO VG 32 band. FVC32D also stays fluid further down the range, with a pour point of -47.5 °C against -37.5 °C for FVC68D. Match the grade to the compressor specification, and keep one grade in the circuit.
Daphne FVC68D is a polyvinyl ether (PVE) refrigeration and air-conditioning lubricant supplied by Idemitsu Kosan Co., Ltd., published under the full product name DAPHNE HERMETIC OIL FVC68D with product code 32450842. Daphne FVC32D is the same family at a lower viscosity: DAPHNE HERMETIC OIL FVC32D, product code 32450850.
Both are synthetic polyether oils, listed on the manufacturer's data sheet as a polyether compound at 95% or more with lubricant additive below 0.1%. They come as clear, colourless liquids and are published for HFC refrigerants: R-134a, R-404A, R-407C and R-410A.
PVE is one of the synthetic families used in refrigeration, alongside POE (polyol ester) and PAG (polyalkylene glycol). The chemistry decides which refrigerants a circuit can run, so a machine set up on PVE is not freely switched to POE without the changeover procedure the compressor maker specifies.
| Parameter | Daphne FVC68D | Daphne FVC32D |
|---|---|---|
| Full product name | DAPHNE HERMETIC OIL FVC68D | DAPHNE HERMETIC OIL FVC32D |
| Product code | 32450842 | 32450850 |
| Base fluid | Polyether (PVE), 95% or more | Polyether (PVE), 95% or more |
| Kinematic viscosity at 40 °C | 66.57 mm²/s | 32.40 mm²/s |
| ISO 3448 viscosity class | ISO VG 68 (61.2 to 74.8) | ISO VG 32 (28.8 to 35.2) |
| Pour point | -37.5 °C | -47.5 °C |
| Flash point, Cleveland open cup | 206 °C | 178 °C |
| Density at 15 °C | 0.9369 g/cm³ | 0.9252 g/cm³ |
| Appearance | Clear, colourless liquid | Clear, colourless liquid |
The two grades share a base chemistry and differ in how heavy the oil is. Viscosity, pour point, flash point and density move together. The lighter oil flows further in the cold and flashes at a lower temperature, 178 °C against 206 °C, while the heavier oil holds a thicker film where the compressor runs hot. Both sets of figures come from the manufacturer's own data sheets for the two grades, the FVC68D sheet and the FVC32D sheet, each hosted on Danfoss's document server.
The grade named in the compressor or unit documentation controls the choice. Both grades are published for the same refrigerant group, so the refrigerant on its own does not separate them; viscosity does.
On circuits that run cold, the oil has to travel back to the compressor through the suction line, and a thinner oil returns more readily. FVC32D, at 32.40 mm²/s with a pour point of -47.5 °C, is the grade for low-temperature and deep-freeze duty.
Where the compressor works against a high pressure ratio and runs hot, the oil film has to hold on the discharge side, and the 68-band grades carry that duty. If the system needs the ISO VG 68 band, the HFC compatibility guide covers how refrigerants and oil families pair up.
A circuit runs on one grade. Where a 68-grade is already in service and the duty has not changed, it stays on 68. Changing the viscosity is a decision the compressor specification makes, so follow the specified grade.
| Grade | Product code | Kinematic viscosity at 40 °C | ISO 3448 class | Pour point | Flash point (COC) |
|---|---|---|---|---|---|
| Daphne FVC32D | 32450850 | 32.40 mm²/s | ISO VG 32 | -47.5 °C | 178 °C |
| Daphne FV50S | 32450893 | 50.69 mm²/s | ISO VG 46 upper limit is 50.6 mm²/s | -37.5 °C | 206 °C |
| Daphne FVC68D | 32450842 | 66.57 mm²/s | ISO VG 68 | -37.5 °C | 206 °C |
| Daphne FV68S | 32450877 | 69.60 mm²/s | ISO VG 68 | -32.5 °C | 210 °C |
The four grades span 32.40 to 69.60 mm²/s. Two of them sit in the same ISO VG 68 band, FV68S at 69.60 and FVC68D at 66.57, and they part company on pour point, -32.5 °C against -37.5 °C. Where a specification admits either, that five-degree gap is the tie-breaker for cold duty. FV50S measures 50.69 mm²/s, which is 0.09 mm²/s above the ISO VG 46 upper limit of 50.6 mm²/s, so the grade is at the top of that band. The two manufacturer data sheets for the S grades are published on Idemitsu's own server, one for FV68S and one for FV50S.
Blending the two changes what circulates in the circuit. The mixture lands between the two published data sets, and neither grade's oil return or film strength holds. Drain and refill with the specified grade, and keep the container closed between top-ups, because PVE takes up moisture from the air.
Chemistry sets the second limit. PVE and POE are different families, so a machine built for POE does not move to PVE, or the reverse, without the changeover procedure the compressor maker specifies.
We supply both grades on either route: the original Idemitsu Daphne product, or our own synthetic refrigeration oil at the nearest listed grade, blended at our own plant in Foshan, Guangdong. The own-brand route comes in your own branded container or a custom pack.
| Item | Detail |
|---|---|
| Company | Guangzhou Qishanr Technologies Co., Ltd. |
| Brand | QISHANR |
| Location | Foshan, Guangdong, China |
| Nearest port | Guangzhou |
| Experience | More than 10 years |
| Own plant | 6,000 tonnes per year |
| Approvals | Certified by major global compressor manufacturers and by SGS |
| Batch documents | Technical data sheet, safety data sheet, certificate of analysis |
| Export documents | CE, certificate of origin, MSDS, transport identification report |
| Third-party testing | Arranged on request |
| Grade selection support | Send the compressor or unit model and we confirm the grade |
| OEM / ODM | Private-label artwork, pack design and material selection |
| Logistics | Sea freight, land transport, air freight and express |
| Distributors | Recruiting in selected markets, with market protection |
Terms are published rather than quoted case by case: T/T and L/C payment, and EXW, FOB, CFR or CIF price terms, so a landed cost can be built against the destination port before you commit to a quantity. There is no fixed minimum order figure, because the minimum moves with the grade, the quantity, the pack size and the destination. A single can and a full container load are both workable.
Own-brand grades at the same viscosity classes: QSL-32H at ISO VG 32, QSL-46H at ISO VG 46 and QSL-68H at ISO VG 68, each manufactured at the Foshan plant.
Ordering Daphne FVC68D or FVC32D?
Send the compressor model, the refrigerant and the quantity. We confirm the grade and the packaging before you order.
A: Only if the compressor specification allows it. The two grades differ in viscosity by more than a factor of two, so one does not substitute for the other in a running circuit even though both are PVE oils for HFC refrigerants. Send the compressor model and we confirm which grade applies.
A: FVC68D pours at -37.5 °C and FVC32D at -47.5 °C. The ten-degree gap is the widest property difference between the two grades apart from viscosity itself.
A: Both are PVE (polyvinyl ether) oils with a polyether base fluid. POE (polyol ester) is a different chemistry, and a circuit set up for one family is not freely switched to the other.
A: Yes. Daphne publishes both grades for HFC refrigerants, which covers R-134a, R-404A, R-407C and R-410A.
A: Do not top up one grade with the other. Mixing them changes the circulating viscosity and takes the oil away from both published data sets, which affects oil return and film strength. Drain and refill with the specified grade, and reseal the container straight after a top-up, because PVE absorbs moisture from the air.
Original publication. This article, “Daphne FVC68D vs FVC32D: Which PVE Grade Fits Your Compressor?”, was originally published by QishanrLubricants on October 16, 2026 at qishanrlubricants.com. © 2026 QishanrLubricants. All rights reserved.
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