Published by QISHANR Technical Application Team | Field Service Review Series
| Item | Operational and Commercial Detail |
|---|---|
| Customer Profile | Industrial refrigeration maintenance contractor servicing cold store facilities and chiller packages |
| Compressor Equipment | Semi-hermetic screw refrigeration compressor package on industrial cold room service |
| Refrigerant Context | HCFC R22 running at medium to low evaporating temperature conditions |
| Lubricant Grade | PCL Suniso 4GS (highly refined naphthenic mineral oil, ISO VG 56 class, 55 cSt @ 40 °C) |
| Core Service Milestones | Compressor model verification, milestone production updates, drum seal verification, and on-time shipment |
| Documentation Package | Complete export dossier including Material Safety Data Sheet (MSDS), Certificate of Origin (CO), and Commercial Invoice |
| Commercial Outcome | Exact technical specification compliance, zero transit leakage, customer planning full container reorder |
The facility maintenance manager submitted feedback detailing their procurement experience, technical verification, and product receipt. Here is their report in their exact words:
"We contacted QISHANR for a replacement oil for our screw compressor. The sales engineer asked about our compressor model and refrigerant first, then recommended 4GS instead of the grade we almost ordered. The quotation was competitive and the payment terms were flexible. After ordering, they updated us on production progress regularly. Delivery was on time; the drums were well sealed and the documents (MSDS, CO, invoice) were complete. The oil matched the specification exactly. We are planning to order a full container next time."
This feedback highlights two distinct operational dimensions that industrial facilities evaluate. The first is technical accuracy prior to purchase, ensuring that large mechanical plant receives the proper viscosity grade.
The second dimension is logistics reliability. Drum sealing integrity and complete export documentation allow smooth customs clearance and immediate plant room charging without administrative delay.
PCL Suniso 4GS is a highly refined naphthenic mineral refrigeration lubricant engineered specifically for industrial refrigeration machinery. In semi-hermetic and open-drive screw compressors, the lubricant performs multiple critical duties simultaneously.
The fluid lubricates radial and axial bearings while sealing the micro-clearances between the intermeshing helical rotors. It also cools the compressed discharge gas and dampens mechanical vibration during high-load continuous cycles.
Refrigerant gas solubility directly affects lubricant selection in screw compressors. Refrigerant R22 exhibits moderate solubility in mineral oils under suction and economizer pressures.
When refrigerant gas dissolves into the oil sump, the liquid mixture experiences viscosity dilution. A lighter lubricant such as an ISO VG 32 mineral oil may dilute to less than 8 cSt under peak discharge conditions, which risks metal-to-metal contact across rolling element bearings.
The heavier ISO VG 56 viscosity class of Suniso 4GS provides 55 cSt at 40 °C and 5.9 cSt at 100 °C. Even under continuous operating loads and temperature excursions, this heavier baseline maintains an operating hydrodynamic film above the 10 cSt threshold required by major screw compressor manufacturers.
This film strength prevents premature bearing wear and preserves tight rotor tip clearances for optimal volumetric efficiency throughout seasonal ambient swings.
Refining depth determines whether a mineral oil functions reliably across extreme refrigeration temperatures. Generic industrial mineral oils contain naturally occurring paraffin wax fractions that cause operational problems.
In low-temperature refrigeration systems, paraffin wax precipitates out of solution inside expansion valves and evaporator coils. This creates insulating deposits that impede heat transfer and choke liquid refrigerant feed lines.
PCL Suniso 4GS is refined from selected naphthenic crude oil stocks through severe hydro-treating and solvent dewaxing. This treatment produces a virtually wax-free formulation with a low pour point of -42 °C and a floc point of -54 °C.
Even in sub-zero evaporators, the fluid remains in mobile liquid phase and returns smoothly to the compressor crankcase with the suction gas stream.
Thermal and chemical stability represent another vital quality benchmark. Operating under discharge valve temperatures up to 140 °C, inferior base oils oxidize and generate acidic sludge.
Suniso 4GS delivers a high Cleveland open cup flash point of 184 °C and outstanding dielectric strength of 40 kV. This chemical stability with refrigerant R22 safeguards motor windings in semi-hermetic compressor units against electrical tracking.
Every parameter published for PCL Suniso 4GS is traceable to standardized laboratory testing protocols. The table below compiles typical physical and chemical properties alongside their respective ASTM test standards and published technical documentation:
| Property | Typical Value | Test Method | Published Source |
|---|---|---|---|
| ISO Viscosity Class | ISO VG 56 class | ISO 3448 | PCL Suniso Technical Data |
| Kinematic Viscosity @ 40 °C | 55 cSt (mm²/s) | ASTM D445 | Suniso 4GS Data Sheet (PDF) |
| Kinematic Viscosity @ 100 °C | 5.9 cSt (mm²/s) | ASTM D445 | PCL Suniso Technical Data |
| Density @ 15 °C | 0.916 kg/L | ASTM D4052 | PCL Suniso Technical Data |
| Flash Point (COC) | 184 °C (364 °F) | ASTM D92 | PCL Suniso Technical Data |
| Pour Point | -42 °C (-44 °F) | ASTM D97 | PCL Suniso Technical Data |
| Floc Point (R12) | -54 °C (-66 °F) | ASHRAE 86 | PCL Suniso Technical Data |
| Dielectric Strength | 40 kV | ASTM D877 | PCL Suniso Technical Data |
| Aniline Point | 77 °C | ASTM D611 | PCL Suniso Technical Data |
| Color Appearance | 1.0 (Pale amber) | ASTM D1500 | PCL Suniso Technical Data |
Fig. 1: Four-stage order fulfillment and documentation workflow for PCL Suniso 4GS. Technical model verification precedes commercial quotations, followed by scheduled batch updates, factory seal verification, and release of complete export dossiers.
QISHANR follows an engineering-first protocol for every industrial lubricant transaction. When a customer contacts our team for replacement refrigeration oil, our sales engineers do not issue an immediate commercial quotation.
Instead, we request the exact compressor manufacturer nameplate details, operating refrigerant, target suction temperature, and oil separator configuration.
In this specific case, the maintenance contractor initially contemplated ordering a lighter grade based on general stock availability. Their equipment consists of large semi-hermetic screw compressors operating on R22.
Our technical engineers verified that the lighter grade would experience excessive thinning under peak summer condensing temperatures. We confirmed that PCL Suniso 4GS, with its measured 55 cSt viscosity at 40 °C, was the correct fluid specified by the compressor engineering manual.
This pre-order review protects plant machinery against oil starvation and reduces operating lifecycle expenses. Once the grade is confirmed in writing against OEM documentation, customers proceed with absolute certainty regarding technical compatibility.
Maintaining lubricant quality during international transit requires rigorous packaging and documentary procedures. Suniso 4GS is packaged in heavy-gauge steel drums and sealed composite containers designed to resist maritime humidity and mechanical handling stress.
Every drum features factory crimp seals and tamper-evident bungs to prevent atmospheric moisture absorption during transit.
Throughout the order cycle, QISHANR provides transparent production and fulfillment tracking. Our dispatch coordinator sends scheduled milestone updates, including container preparation photos, batch filling records, and warehouse seal checks prior to transport.
This active communication eliminates uncertainty for maintenance managers planning tight facility turnaround windows.
Each international shipment travels with a comprehensive documentation dossier compiled prior to vessel departure. The dossier includes the formal Certificate of Origin (CO) for preferential customs duty treatment, the product Material Safety Data Sheet (MSDS), commercial invoices, and packing lists.
Laboratory batch analysis certificates accompany the shipping manifest so that incoming inspection proceeds without delay. Customs clearance proceeds without administrative friction, allowing the maintenance team to receive, inspect, and charge the compressors immediately.
PCL Suniso 4GS provides dependable lubrication across defined industrial equipment boundaries, but selecting the correct oil requires matching the refrigerant and compressor design. Review the following selection criteria before ordering:
PCL Suniso 4GS is a highly refined naphthenic mineral refrigeration oil formulated from wax-free naphthenic base stocks. It belongs to the ISO VG 56 viscosity class with a measured kinematic viscosity of 55 cSt at 40 °C, designed specifically for commercial and industrial refrigeration compressors requiring elevated hydrodynamic film strength.
PCL Suniso 4GS is designed for systems operating on CFC and HCFC refrigerants, including R22, R12, R502, and specified natural refrigerants such as R717 ammonia, R600a isobutane, and R290 propane where the compressor manufacturer specifies a compatible mineral oil.
Refrigeration compressor bearing clearance, operating discharge temperature and refrigerant gas dilution dictate the required viscosity grade. Verifying the exact compressor model and refrigerant prevents misapplication between lighter ISO VG 32 grades and heavier ISO VG 56 grades prior to order placement.
Every international shipment includes a complete documentation dossier comprising the technical data sheet (TDS), safety data sheet (MSDS), Certificate of Origin (CO), commercial invoice, packing list, and batch quality certificate.
QISHANR supplies genuine PCL Suniso 4GS in 4 L containers, 20 L pails, and 200 L steel drums for facility maintenance operations and full container export. Send your compressor manufacturer details, refrigerant specification, and destination port to our engineering desk for technical confirmation and an itemized CIF quotation.
