Direct answer: A customer reported replacing Emkarate RL32H with Qishanr QSL-32H in a scroll compressor on R134a, describing the system as working well with no sludge observed after two months of operation at a good cost. Both oils are ISO VG32 polyol ester (POE) grades, so the chemistry family and the viscosity already matched. Two months without visible sludge is an early checkpoint, not a long-term verdict — what decides the outcome is the changeover procedure, moisture control and the oil analysis taken at the next service interval.
The source is a single short customer message, so it is quoted in full rather than paraphrased.
| Case element | What was supplied | How to read it |
|---|---|---|
| Compressor | A scroll compressor. Manufacturer, model, capacity and oil charge were not supplied. | Establishes the compressor type only; the model documentation decides the required grade. |
| Changeover | QSL-32H used in place of Emkarate RL32H. | A like-for-like change in the same oil family and the same ISO VG32 grade. Flushing and evacuation steps were not recorded. |
| Refrigerant | R134a. | An HFC refrigerant, which is the normal application window for a POE lubricant. |
| Observation period | Two months of operation. | An early checkpoint; service intervals in this class of equipment run considerably longer. |
| Sludge | None observed after two months. | A customer field observation, not a laboratory result. No oil sample or acid and moisture reading was supplied. |
| Cost | “Good cost performance.” | The customer's own commercial assessment. No price, quantity or freight figure was provided. |
Emkarate RL32H is an ISO VG32 synthetic polyol ester lubricant formulated for refrigeration and air-conditioning compressors on HFC refrigerants. Qishanr QSL-32H is also a full synthetic polyol ester oil in the ISO VG32 grade, and R134a is among the refrigerants it is intended for. That overlap is the precondition for treating the two as interchangeable grades.
Viscosity carries the oil film at the bearings and scroll flanks; the ester base keeps the oil miscible with R134a so it returns from the evaporator instead of logging there. Change either one and the changeover stops being like-for-like.
Sludge in an HFC circuit is normally a symptom of something else in the system rather than a property of a correctly specified oil. The recurring causes are also the ones an operator can control:
Read against that list, the two-month observation says something specific: no sludge became visible in this system over the first weeks of R134a operation after the change. It does not prove the circuit was dry, and it cannot predict how the oil will look at twelve months.
The values below are the current published QSL-32H product reference data — screening information for a changeover review, not a batch certificate or a substitute for the technical data sheet and the compressor documentation.
| Property | QSL-32H published value | Why it matters here |
|---|---|---|
| Base oil / grade | Full synthetic polyol ester (POE), ISO VG32 | Matches the RL32H chemistry family and grade used in the case. |
| Viscosity @ 40°C | 32.5 cSt | Sets film strength under normal operating load. |
| Viscosity @ 100°C | 5.8 cSt | Indicates how much film is retained at working temperature. |
| Viscosity index | 121 | How stable viscosity stays across the operating range. |
| Density @ 20°C | 0.977 g/mL | Used to convert between volume and mass for an oil charge. |
| Flash point (COC) | 258°C | An indicator of thermal headroom on the discharge side. |
| Pour point | −46°C | Relevant to cold-start flow and low-temperature oil return. |
| Acid value | <0.05 mg KOH/g | The baseline a later oil sample is compared against. |
| Available packaging | 1 L / 5 L / 10 L / 20 L / 200 L | Lets a service fill and a system fill draw on the same sealed product. |
Full product information and the inquiry form are on the Qishanr QSL-32H product page.
The QSL-32H listing carries a reference list of oils that buyers compare it against. Emkarate RL32H sits on that list, together with the following names as supplied: Bitzer BSE32, Hanbell HBR-B12, Daphne FVC32D / 32S, Suniso SL32, Solest LT-32, York / Frick K, McQuay A, Refcomp B032, Frascold F-32E and CPI CP-2931A.
These names are reference information for a review, not an equivalence certificate. A listed name does not mean automatic one-to-one substitution, universal drop-in use or OEM approval. Final selection still requires the required viscosity, refrigerant compatibility, oil quantity, the service procedure and an application review.
For the same principle worked through at another grade, see the QSL-68H vs Emkarate RL68H vs CPI Solest 68 cross-reference guide, and for the wider chemistry background the POE oil vs mineral oil comparison.
A short, repeated record turns an impression into evidence. Capture these points at the next planned service visit:
The customer described cost performance as good. No price, order quantity or freight figure was supplied, so what follows is the comparison framework rather than a number.
Lowest price per litre and lowest total cost are frequently different numbers: an order that avoids a second flush, or that does not tie up capital in packaging the site cannot use, often outweighs a small difference in list price.
| Likely fit | Not a fit, or needs a different review |
|---|---|
| R134a and other HFC refrigeration compressors specified for an ISO VG32 POE, where the current fill is a VG32 POE such as Emkarate RL32H. | Systems whose documentation requires another viscosity grade or another oil family — legacy mineral-oil R22 circuits, or PAG and PVE applications such as automotive and electric-compressor systems. |
| Service and first fills where moisture control can be maintained during storage, filling and operation. | Circuits that cannot be kept dry, where residual oil from a previous charge cannot be cleared, or where the compressor already runs at high discharge temperature. |
| Buyers who want a documented, sample-based service record at two and six months. | Anyone treating a listed replacement name, or a visual “no sludge” observation, as the release criterion without checking the compressor documentation. |
QSL-32H is the same oil family and the same ISO VG32 grade as Emkarate RL32H, and it appears on the supplier reference list for RL32H. That makes it a candidate for a like-for-like change in an HFC compressor, as in this case — but it is not an OEM approval or an automatic substitution for every machine. Confirm the compressor manufacturer's requirement, the refrigerant and the oil quantity before ordering.
Yes. R134a is an HFC refrigerant and QSL-32H is a POE lubricant intended for HFC systems including R134a. Because POE oils absorb moisture readily, handling and dehydration discipline is part of using the oil correctly.
No. It records one customer's report that no sludge was seen after two months of R134a operation following the change to QSL-32H. Sludge formation is influenced by moisture, contamination, residual oil, discharge temperature and the service procedure, and none of those variables was measured and reported here.
Send the compressor manufacturer and model, compressor type, refrigerant, current oil brand and grade, required viscosity, estimated oil quantity, preferred packaging size, destination port and any service or technical documents, so the request can be reviewed against the application rather than a single observation.
Replacing Emkarate RL32H with QSL-32H on an R134a scroll compressor? Share the compressor, refrigerant, oil quantity, packaging size and destination to request a technical quotation.
Request a QSL-32H Quote
