Twelve naphthenic base oil grades from light V2 to heavy V1000. Ultra-low pour point as low as −70°C and exceptional solvency for transformer oil, rubber process oil, refrigeration oil and specialty industrial fluids.
While paraffinic base oils dominate engine oil and general lubricant blending, naphthenic base oils are the preferred specialty stock for transformer oil, rubber compounding, refrigeration systems and many industrial fluids.
Refined from crude oils rich in cyclic saturated hydrocarbons (naphthenes) rather than straight-chain paraffins, naphthenic base oil delivers a unique combination of very low pour point (some grades below −70°C), excellent solvency for additives and elastomers, low aniline point, and higher density than paraffinic oils.
Sinolook supplies a complete naphthenic portfolio — 12 grades from V2 to V1000 — covering every viscosity requirement from refrigeration oil to heavy rubber process oil. All grades come with detailed typical-value data sheets and full SGS verification.
Down to −70°C — outperforms any paraffinic base oil in cold flow.
High aromatic and naphthenic content dissolves additives and softens elastomers.
KV40 from 1.5 to over 1000 mm²/s — single-source supply for every application.
Third-party testing on every shipment — full traceability and TDS/COA.
Both are mineral base oils, but their molecular structures lead to very different properties — and very different applications. If you're choosing between paraffinic Group I/II and naphthenic for a specialty application, this comparison should help.
Need paraffinic instead? View Group I SN range → or Group II hydrocracked →
The defining feature of naphthenic base oil is its hydrocarbon composition — measured by the n-d-M analysis (ASTM D2140) as CA (aromatic carbon), CN (naphthenic carbon) and CP (paraffinic carbon). Naphthenic grades are dominated by CN content, which drives all the unique properties.
Naphthenic carbon (CN) dominates — driving low pour point and high solvency. CA content provides additional solvency for elastomers and additives.
Choose by required viscosity. Sinolook's full lineup covers the entire naphthenic spectrum from ultra-light V2 (KV40 = 1.5) to ultra-heavy V1000 (KV40 = 1014).
Typical values from recent production batches. All grades tested per ASTM standards. Batch-specific COA available with each shipment.
| Property | V2 | V2(I) | V2(II) | V4 | V7 | V9 | V9(I) | V9(II) | V22 | V36 | V100 | V1000 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KV @ 40°C (mm²/s) | 1.465 | 1.604 | 1.796 | 3.27 | 8.387 | 8.27 | 9.654 | 8.744 | 22.32 | 32.66 | 92.6 | 1014 |
| KV @ 100°C (mm²/s) | — | — | — | — | — | — | — | — | 3.65 | 5.33 | 8.30 | 23.97 |
| Density @ 20°C (kg/m³) | 832.8 | 835.4 | 838.1 | 870 | 887.6 | 889.5 | 896.4 | 891.9 | 912 | 903.4 | 903 | 929.2 |
| Flash Point (°C) | 65.5 | 72 | 85.5 | 115 | 137.5 | 138 | 146 | 138 | 173 | 206 | 222 | 228 |
| Pour Point (°C) | <−60 | <−60 | <−70 | <−50 | <−50 | −48 | <−48 | <−54 | −30 | <−50 | −43 | −4 |
| Saybolt Color | >+30 | >+30 | >+30 | >+30 | +30 | +30 | +30 | +25 | +30 | +19 | — | — |
| Sulphur (wt%) | 0.01 | 0.01 | 0.01 | — | — | — | — | 0.3 | — | 0.42 | 0.46 | 0.031 |
| Aniline Point (°C) | — | — | 80.6 | — | 70 | — | — | — | 93.5 | — | — | — |
All values per ASTM D445 (viscosity), D4052 (density), D92/D93 (flash), D97 (pour), D156 (color), D4294 (sulphur), D611 (aniline). Detailed n-d-M carbon analysis (CA/CN/CP per ASTM D2140) available on request.
Five major specialty markets rely on naphthenic base oil where paraffinic alternatives cannot match the pour point, solvency or elastomer compatibility required.
Light naphthenic grades meet IEC 60296 transformer oil specifications — combining very low pour point for cold-climate installations, high dielectric strength, and excellent oxidation resistance. Used in distribution transformers, power transformers, switchgear and capacitors worldwide.
The largest naphthenic application globally. Used in tire treads, EPDM weather seals, NBR/HNBR oil seals, SBR and CR rubber compounding. Naphthenic RPO outperforms paraffinic for low-temperature flexibility, mixing behavior, and compatibility with most synthetic rubbers.
Naphthenic base oil with pour point below −60°C is the traditional refrigeration oil base, particularly for ammonia (NH₃) refrigeration in industrial chillers, food processing and cold storage. Also used in HFC systems where mineral compatibility is acceptable.
Naphthenic base oil's high solvency makes it ideal for soluble cutting fluids, neat cutting oils, drawing compounds and quenching oils. Also used in printing inks (offset, screen), adhesives, sealants, and as a carrier in specialty industrial chemicals.
Light grades (V2 to V9) ship in clean food-grade ISO tanks or drums to prevent any contamination — important for transformer oil and refrigeration oil applications. Heavy grades (V100, V1000) ship in standard ISO tanks and bulk vessels.
80 drums per 20' container · sealed steel
Heavy grades only (V22+) · single-use
Light grades use food-grade tanks
Heavy grades · 1,000+ MT shipments
Tell us the grade(s), volume and end-use application — we'll respond within 24 hours with batch-current TDS, SGS report, pricing and logistics options for any of our 12 grades.
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