BS 150 Base Oil Specifications: Properties, Grades & Standards

Key takeaways

SN 150 and BS 150 describe the same light neutral base oil grade with SN denoting Solvent Neutral refining and BS 150 being a legacy British Standard now aligned with ISO VG 150.
According to ExxonMobil Basestocks (current API classification),
ISO VG 150 specifies only the 40 °C kinematic viscosity range of 135, 165 mm²/s and a 200 °C minimum flash point leaving other properties supplier dependent.
Group I SN 150 kinematic viscosity at 100 °C ranges 4.0, 4.5 mm²/s versus 4.2, 4.7 mm²/s for Group II due to narrower boiling range from hydrotreating.
Pour point maximum is -12 °C for Group I and -15 °C for Group II with dewaxed grades reaching -18 °C reflecting lower wax content in hydrotreated material.
Color on ASTM D1500 scale is Max 1.0 for Group I and Max 0.5 for Group II while sulfur drops from 0.8, 1.0 wt% in Group I to below 0.03 wt% in Group II.
Certificate of analysis must cite ASTM D445 for viscosity, ASTM D97 for pour point, ASTM D92 for flash point, ASTM D1500 for color, and ASTM D2622 for sulfur with method revision years.
REACH registration under EC 265-157-1 and CAS 64742-54-7 is mandatory for EEA imports above one tonne per year with SDS Section 15 requiring the registration number.
FDA 21 CFR 178.3620 compliance with UV absorbance and extraction limits plus a Letter of Guaranty is required for H1/H2 incidental food contact lubricant formulations.
GHS classification typically assigns Aspiration Hazard Category 1 (H304) and Skin Irritation Category 2 (H315) requiring 16-section SDS with Danger signal word and GHS08 pictogram.

BS 150 base oil specifications define the quality parameters for a light neutral grade widely used in industrial lubricants, hydraulic fluids, and gear oils. The grade sits at the intersection of legacy nomenclature, BS 150 from British Standards, SN 150 from solvent neutral refining, and ISO VG 150 from the international viscosity classification, and modern API Group I and Group II chemistry that determines oxidative stability, additive response, and regulatory compliance. Buyers and formulators must navigate differing property limits, test methods, and documentation requirements across these systems to write enforceable contracts and avoid off-grade deliveries.

This guide covers the complete specification table comparing Group I SN 150, Group II SN 150, and ISO VG 150 limits for viscosity, pour point, flash point, color, sulfur, and aniline point. It maps each property to its ASTM, IP, and ISO test methods with acceptance criteria and precision statements needed for certificates of analysis. It explains how solvent neutral versus hydrotreating manufacturing routes drive the specification gaps, details REACH, RoHS, FDA, and GHS compliance obligations, and outlines formulation guidelines for industrial gear oils, hydraulic fluids, and other end uses so you can specify, procure, and blend with confidence.

What Is BS 150 / SN 150 Base Oil? Terminology & Standards Clarification

SN 150 vs BS 150 vs ISO VG 150 naming conventions

SN 150 and BS 150 refer to the same light neutral base oil grade but originate from different naming systems. SN stands for Solvent Neutral and denotes the traditional solvent-refining process that produces a viscosity of approximately 4 cSt at 100 °C. BS 150 is a legacy British Standard designation that has been largely superseded by ISO VG 150 under ISO 3448 which defines the viscosity grade by its midpoint kinematic viscosity of 150 mm²/s at 40 °C. In commercial contracts the term SN 150 remains the default shorthand for Group I material while ISO VG 150 is used when the specification is written to the industrial lubricant grade rather than the refinery cut. Buyers should verify which nomenclature appears on the certificate of analysis to avoid receiving an off-grade product.

API Group I, II, III classification thresholds

API base oil categories are defined by saturates, sulfur and viscosity index. According to ExxonMobil Basestocks (current API classification), SN 150 is historically a Group I grade although modern hydrotreating allows the same viscosity cut to qualify as Group II. Group I constituted 38% of global base oil production capacity in 2023 according to Lube Report (Lubes'n'Greases). Understanding the API group is critical because it determines the oxidative stability and additive response of the finished lubricant.

Relevant ASTM, IP, and ISO standard references

The primary test standards for SN 150 are ASTM D445 for kinematic viscosity, ASTM D2270 for viscosity index, ASTM D97 for pour point, ASTM D92 for Cleveland open cup flash point and ASTM D1500 for color. The Institute of Petroleum equivalents are IP 71, IP 226, IP 15, IP 36 and IP 196 respectively. ISO 3104, ISO 2909, ISO 3016, ISO 2592 and ISO 2049 provide the parallel international methods. Specifications normally cite the ASTM method as the referee test with IP or ISO alternatives accepted by mutual agreement. When drafting a purchase contract reference the exact method number and year to prevent disputes over procedural updates.

Complete Specification Table: Group I SN 150 vs Group II SN 150 vs ISO VG 150 Limits

Kinematic viscosity at 40°C and 100°C ranges

Kinematic viscosity at 40 °C defines the ISO VG 150 grade with a midpoint of 150 mm²/s and an allowable range of 135 to 165 mm²/s. At 100 °C Group I SN 150 typically falls between 4.0 and 4.5 mm²/s while Group II SN 150 runs slightly higher at 4.2 to 4.7 mm²/s due to its narrower boiling range. The 100 °C viscosity controls the high-temperature film thickness in engine and hydraulic applications. Group II accounted for 41% of global base oil production capacity in 2023 according to Lube Report (Lubes'n'Greases). Buyers should confirm the referee temperature in the contract because a 0.1 mm²/s shift at 100 °C can change the viscosity index calculation and the final blend performance.

Viscosity index, pour point, flash point COC limits

Viscosity index for Group I SN 150 ranges from 90 to 105 while Group II SN 150 typically achieves 100 to 115 reflecting the higher saturates content. Pour point limits are minus 12 °C maximum for Group I and minus 15 °C maximum for Group II although dewaxed grades can reach minus 18 °C. Cleveland open cup flash point is a safety criterion set at 200 °C minimum for both groups with typical values between 210 and 230 °C. These three properties together determine the operating temperature window and the treat rate of viscosity index improvers in the finished oil.

Color ASTM D1500, sulfur content, aniline point values

Color on the ASTM D1500 scale is 1.0 maximum for Group I and 0.5 maximum for Group II indicating the superior purity of hydrotreated material. Sulfur content is the key differentiator with Group I capped at 0.8 to 1.0 percent by weight and Group II below 0.03 percent or 300 ppm according to ExxonMobil Basestocks (current API classification). Aniline point correlates with aromatic content and ranges from 90 to 100 °C for Group I versus 105 to 115 °C for Group II. Low sulfur and high aniline point improve oxidation stability and reduce sludge formation in service.

Property	Test Method	Group I SN 150	Group II SN 150	ISO VG 150
Kinematic Viscosity at 40 °C (mm²/s)	ASTM D445	135, 165	135, 165	135, 165
Kinematic Viscosity at 100 °C (mm²/s)	ASTM D445	4.0, 4.5	4.2, 4.7	Not specified
Viscosity Index	ASTM D2270	90, 105	100, 115	Not specified
Pour Point (°C)	ASTM D97	Max -12	Max -15	Not specified
Flash Point COC (°C)	ASTM D92	Min 200	Min 200	Min 200
Color ASTM D1500	ASTM D1500	Max 1.0	Max 0.5	Not specified
Sulfur (wt%)	ASTM D4294	0.8, 1.0	Max 0.03	Not specified
Aniline Point (°C)	ASTM D611	90, 100	105, 115	Not specified

The table above aligns typical refinery release specifications for Group I and Group II SN 150 against the ISO VG 150 viscosity grade envelope. Note that ISO VG 150 only governs the 40 °C viscosity band and flash point while the remaining properties are supplier dependent. When writing a purchase specification always attach the full property table with test methods and precision statements to the contract annex.

Test Methods & Acceptance Criteria (ASTM / IP / ISO Standards Mapping)

Every critical property on a certificate of analysis must reference a recognized standard test method to ensure reproducibility across laboratories. The table below maps each key specification to its primary ASTM and ISO equivalents so procurement teams can verify that the CoA cites the correct procedure and precision statement. Using the wrong method, for example reporting kinematic viscosity by ASTM D7042 without a correlation study, can invalidate the acceptance criteria in a letter of credit. Global nameplate base oil capacity is approximately 60 million t/y according to Lube Report, which underscores the need for harmonized testing across high-volume supply chains.

Property	Primary ASTM Method	Primary ISO / IP Method	Typical Acceptance Criteria on CoA	Precision Reference
Kinematic Viscosity at 40 °C	ASTM D445	ISO 3104 / IP 71	135, 165 mm²/s	ASTM D445 Repeatability r = 0.35 %
Kinematic Viscosity at 100 °C	ASTM D445	ISO 3104 / IP 71	Group I 4.0, 4.5 \| Group II 4.2, 4.7 mm²/s	ASTM D445 Repeatability r = 0.55 %
Pour Point	ASTM D97	ISO 3016 / IP 15	Group I Max -12 °C \| Group II Max -15 °C	ASTM D97 Reproducibility R = 6 °C
Flash Point COC	ASTM D92	ISO 2592 / IP 36	Min 200 °C	ASTM D92 Reproducibility R = 8 °C
Color	ASTM D1500	ISO 2049 / IP 196	Group I Max 1.0 \| Group II Max 0.5	ASTM D1500 Reproducibility R = 0.5 scale units
Sulfur	ASTM D2622	ISO 8754 / IP 336	Group I 0.8, 1.0 wt% \| Group II Max 0.03 wt%	ASTM D2622 Repeatability r = 0.0015 wt%

When reviewing a CoA confirm that the laboratory reports the test method revision year and includes a statement of compliance with ISO 17025 accreditation. For sulfur the X-ray fluorescence method ASTM D2622 is preferred over ASTM D4294 for Group II material because the lower detection limit matches the sub-300 ppm specification. Always attach the precision statements to the purchase contract annex so disputes can be resolved against published repeatability and reproducibility limits rather than subjective interpretation.

Viscosity: ASTM D445 / ISO 3104

Viscosity is measured by ASTM D445 using a calibrated glass capillary viscometer at precisely controlled temperatures of 40 °C and 100 °C. The test requires temperature stability within ±0.01 °C and viscosity readings are accepted only when two determinations agree within the method repeatability limit of 0.35 percent at 40 °C. ISO 3104 is technically equivalent and accepted globally for customs classification under HS 2710.19. A CoA that lists only a single viscosity value without the duplicate run identifier should be rejected because the precision statement cannot be verified.

Pour point: ASTM D97 / ISO 3016

Pour point determines the lowest temperature at which the oil still flows under standardized cooling conditions using ASTM D97. The automatic tilt method ASTM D5950 is an accepted alternative but must be declared on the CoA because its reproducibility differs by up to 3 °C from the manual method. For Group I SN 150 the typical maximum is -12 °C while Group II achieves -15 °C due to lower wax content. Always verify the cooling bath medium and thermometer calibration date on the lab report to ensure the result meets the contract specification.

Flash point COC: ASTM D92 / ISO 2592

Flash point by Cleveland Open Cup ASTM D92 is a safety critical property with a minimum acceptance of 200 °C for SN 150 grades. The test uses a 70 ml sample heated at 5 to 6 °C per minute with ignition attempts every 1 °C. ISO 2592 provides the harmonized international equivalent. A flash point below 200 °C indicates contamination with lighter fractions or incomplete solvent removal and triggers an automatic rejection under most refinery release specifications. Record the barometric pressure on the CoA because the method requires correction to 101.3 kPa.

Color: ASTM D1500 / ISO 2049

Color is assessed visually against standardized glass slides using ASTM D1500 with a 0.5 to 8.0 scale where lower numbers indicate lighter oil. Group I SN 150 typically passes at Max 1.0 while Group II must meet Max 0.5 reflecting the higher saturates content from hydrotreating. ISO 2049 is the direct equivalent. Automated spectrophotometric methods such as ASTM D6045 can be used for screening but the referee method remains visual comparison. Lighting conditions must conform to CIE standard illuminant C and the observer must pass a color vision test per ASTM D1535.

Sulfur: ASTM D2622 / ISO 8754

Sulfur content is quantified by wavelength dispersive X-ray fluorescence ASTM D2622 which covers the range 0.0017 to 5.0 weight percent. For Group II SN 150 the specification maximum of 0.03 wt% sits near the lower calibration range so laboratories must run a low-level check standard at 0.01 wt% to demonstrate accuracy. ISO 8754 and IP 336 are the recognized equivalents. Energy dispersive XRF ASTM D4294 lacks the sensitivity for reliable Group II certification and should not appear on a CoA for hydrotreated grades. Always request the calibration curve verification data when sulfur is a contractual limit.

Manufacturing Route Impact on Specs: Solvent Neutral vs Hydrotreated

The manufacturing route defines the fundamental chemistry of SN 150 and drives every specification difference between Group I and Group II. Solvent neutral refining uses furfural or NMP extraction to remove aromatics and dewaxing to set pour point while hydrotreating uses hydrogen at elevated temperature and pressure to saturate aromatics and crack wax isomers. The resulting saturates level sulfur content and viscosity index divergence are direct consequences of process severity not additive packages.

Solvent neutral (Group I) process chemistry and typical outputs

Solvent neutral (Group I) process chemistry relies on liquid-liquid extraction with furfural or N-methyl-2-pyrrolidone to selectively dissolve aromatics and polar compounds from the vacuum distillate. The raffinate then passes through a dewaxing unit using methyl ethyl ketone toluene solvent to crystallize and filter wax which sets the pour point. Typical yields are 65 to 75 percent of feed. This route produces a cost effective base oil suitable for industrial lubricants where oxidative stress is moderate.

Hydrotreating (Group II) severity impact on VI and color

Hydrotreating (Group II) severity impact on VI and color is governed by reactor temperature hydrogen partial pressure and catalyst activity. At typical severities of 380 to 410 °C and 50 to 100 bar hydrogen pressure the process saturates aromatics to naphthenes and cracks waxy paraffins to iso-paraffins which simultaneously raises viscosity index and drives color below ASTM 0.5. Sulfur drops to below 300 ppm as hydrogen sulfide. According to ExxonMobil Basestocks (current API classification) the higher saturates level dramatically improves oxidation stability measured by RPVOT. Yield is lower at 55 to 65 percent of feed but the premium over Group I justifies the capital intensity for applications requiring longer drain intervals.

Oxidation stability and additive response differences

Oxidation stability and additive response differences stem directly from the saturates and sulfur gap between the two routes. Group I SN 150 consumes phenolic antioxidants faster because residual aromatics act as oxidation initiation sites. Group II SN 150 extends antioxidant life by a factor of two to three in bench tests such as ASTM D2272 RPVOT according to ExxonMobil Basestocks (current API classification). The lower sulfur also reduces interference with zinc dialkyldithiophosphate antiwear chemistry allowing treat rates to be cut by 10 to 15 percent in hydraulic fluid formulations. Formulators must rebalance detergent inhibitor packages when switching grades because the aniline point shift from 95 to 110 °C alters seal compatibility and additive solubility.

Regulatory & Compliance Requirements (REACH, RoHS, FDA, GHS)

REACH registration numbers and SDS Section 15 requirements

REACH registration numbers must appear in Section 15 of the Safety Data Sheet for any BS 150 base oil imported into the European Economic Area above one tonne per year. The registration dossier covers the petroleum substance identity EC 265-157-1 and CAS 64742-54-7 with tonnage band specific Chemical Safety Reports. Importers without their own registration must source from a registered Only Representative or EU manufacturer to maintain legal supply. Downstream users blending finished lubricants rely on the exposure scenarios attached to the registration for their own compliance.

RoHS substance restrictions for electrical applications

RoHS substance restrictions for electrical applications limit lead mercury cadmium hexavalent chromium PBB and PBDE to 0.1 percent by weight in homogeneous materials with cadmium capped at 0.01 percent. BS 150 base oil used in transformer oils or cable filling compounds must demonstrate compliance through supplier declarations supported by ICP-MS or XRF test certificates. Phthalates DEHP BBP DBP and DIBP added under RoHS 3 are not typically present in mineral base oils but confirmation is required for formulations containing plasticisers.

FDA 21 CFR 178.3620 for incidental food contact (H1/H2)

FDA 21 CFR 178.3620 for incidental food contact (H1/H2) applies to BS 150 base oil used in lubricants with potential incidental contact in food processing equipment. The regulation requires the base oil to meet ultraviolet absorbance limits at specific wavelengths and pass the FDA extraction test using hexane. H1 lubricants allow up to 10 ppm incidental contact while H2 lubricants permit no food contact. Formulators must verify the base oil supplier provides a Letter of Guaranty referencing the specific CFR section.

GHS classification and labeling obligations

GHS classification and labeling obligations for BS 150 base oil typically result in Aspiration Hazard Category 1 H304 with the signal word Danger and the pictogram GHS08. Skin irritation Category 2 H315 may apply depending on refining severity. The Safety Data Sheet must follow the 16 section format with hazard statements precautionary statements and supplier identification in Section 1. Transport classification under ADR IMO IMDG is generally Not Regulated unless flash point falls below 60 °C.

Regulation	Key Requirement	Typical Classification	Documentation Needed
REACH	Registration >1 t/y EEA	EC 265-157-1 CAS 64742-54-7	SDS Section 15 CSR Exposure Scenarios
RoHS	Heavy metal phthalate limits	Pb Hg Cd Cr(VI) <0.1% Cd <0.01%	Supplier Declaration ICP-MS XRF Certs
FDA 21 CFR 178.3620	UV absorbance extraction limits	H1 10 ppm H2 No contact	Letter of Guaranty FDA Test Report
GHS	16 Section SDS Hazard pictograms	H304 Aspiration Cat 1 H315 Skin Irrit Cat 2	SDS Label Transport Classification

The table summarises the four regulatory pillars governing BS 150 base oil trade. REACH drives the highest documentation burden for European market access requiring active registration management. RoHS compliance is a pass fail gate for electrical sector tenders. FDA 21 CFR 178.3620 certification opens the food grade lubricant premium segment. GHS alignment ensures global hazard communication consistency across all shipping documents and workplace labels.

Applications & Formulation Guidelines by End-Use

Industrial gear oils (ISO VG 150/220 blending)

Industrial gear oils (ISO VG 150/220 blending) use BS 150 base oil as the primary carrier for extreme pressure additive packages. The 28 to 32 cSt at 40 °C viscosity window allows formulators to hit ISO VG 150 with minimal viscosity index improver treat rate. Group I SN 150 provides superior additive solubility for sulphur phosphorus EP chemistries while Group II SN 150 extends oxidative life in high temperature enclosed gearboxes. Typical treat rates range from 3 to 6 percent for AGMA 9005-E02 compliance.

Hydraulic fluids (AW/ISO HM/HV grades)

Hydraulic fluids (AW/ISO HM/HV grades) rely on BS 150 base oil for antiwear hydraulic oils meeting ISO 11158 HM and HV categories. The aniline point of Group I SN 150 near 95 °C ensures zinc dialkyldithiophosphate solubility at 0.08 to 0.12 percent phosphorus treat. Group II SN 150 with aniline point above 110 °C may require solubility boosters for high ZDDP concentrations. Low temperature pumpability for HV grades demands pour point below -30 °C often achieved with pour point depressants at 0.1 to 0.3 percent.

Transformer oils (IEC 60296 inhibition requirements)

Transformer oils (IEC 60296 inhibition requirements) specify BS 150 base oil with high saturates low aromatics and inhibited oxidation stability. Group II SN 150 meets the IEC 60296 Table 2 requirement for oxidation stability at 120 °C with 0.3 percent DBPC inhibitor delivering >500 hours according to ExxonMobil Basestocks (current API classification). Group I SN 150 typically fails the unrestricted breathing test without higher inhibitor doses. Water content must remain below 30 ppm and breakdown voltage above 30 kV for new oil acceptance.

Metalworking fluids and mould oil formulations

Metalworking fluids and mould oil formulations use BS 150 base oil for neat cutting oils and concrete release agents. The viscosity provides sufficient film strength for broaching and gear hobbing while allowing mist suppression additive incorporation. Mould oils leverage the narrow boiling range of solvent neutral grades for clean burnout in foundry cores. Chlorinated paraffin solubility in Group I SN 150 supports extreme pressure performance in heavy duty machining.

Grease base stock thickener compatibility

Grease base stock thickener compatibility with BS 150 base oil determines soap fibre formation and oil bleed characteristics. Lithium 12-hydroxystearate thickeners at 6 to 10 percent yield NLGI 2 consistency with Group I SN 150 showing minimal oil separation in ASTM D1742. Group II SN 150 may require polar additives to improve thickener yield due to lower aromatic content. Calcium sulphonate complex greases benefit from the higher aniline point of Group II for thermal stability.

Application	Key Standard	Preferred Grade	Critical Property	Typical Treat Rate
Industrial Gear Oil	AGMA 9005 ISO 12925	Group I or Group II	Additive Solubility Oxidation Life	3-6% EP AW VI Improver
Hydraulic Fluid	ISO 11158 HM HV	Group I for ZDDP Group II for Long Life	Aniline Point Low Temp Pumpability	0.08-0.12% P ZDDP 0.1-0.3% PPD
Transformer Oil	IEC 60296	Group II	Oxidation Stability Water Content	0.3% DBPC Inhibitor
Metalworking Fluid	ISO 6743-7	Group I	Chlorinated Paraffin Solubility	5-15% EP Additives
Grease Base Stock	NLGI ASTM D217	Group I for Li Group II for CaSul	Thickener Yield Oil Bleed	6-10% Soap Fibre

The table maps BS 150 base oil grades to five major end use categories with their governing standards and formulation levers. Global lubricant demand is around 38 million tons per year in 2024 according to Lube Report (Lubes'n'Greases). Gear oils and hydraulic fluids consume the largest share of SN 150 volume. Transformer oils demand the highest purity Group II grades. Metalworking fluids exploit Group I solvency. Grease manufacturers select base oil based on thickener chemistry compatibility.

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Conclusion

Specify the exact API group, test methods with revision years, and full property limits in every purchase contract annex to prevent off-grade deliveries. Verify that the certificate of analysis cites ASTM D445, D97, D92, D1500, and D2622 with duplicate run identifiers and ISO 17025 accreditation statements. Confirm REACH registration numbers appear on the SDS for EEA shipments above one tonne per year and that FDA 21 CFR 178.3620 compliance with a Letter of Guaranty is documented for incidental food contact grades.

Cross-check the nomenclature on the CoA against the agreed specification because SN 150, BS 150, and ISO VG 150 are not interchangeable without explicit property alignment. Use Global Trade Plaza to identify and verify suppliers who provide complete documentation packages matching these requirements.

Frequently Asked Questions

What is the difference between BS 150 and SN 150 base oil?

BS 150 and SN 150 refer to the same light neutral base oil grade but originate from different naming systems. BS 150 is a legacy British Standard designation now aligned with ISO VG 150 while SN 150 denotes Solvent Neutral refining. In commercial contracts SN 150 remains the default shorthand for Group I material whereas ISO VG 150 is used for industrial lubricant grades.

What is the SN 150 base oil specification?

SN 150 specification varies by API group with Group I requiring 90 to 105 viscosity index, maximum -12 °C pour point, 0.8 to 1.0 wt% sulfur and maximum 1.0 ASTM D1500 color. Group II tightens these to 100 to 115 viscosity index, maximum -15 °C pour point, maximum 0.03 wt% sulfur and maximum 0.5 color. Both groups share the 135 to 165 mm²/s viscosity range at 40 °C and minimum 200 °C flash point.

How to read BS 150 base oil specification PDF?

Verify the document references ISO VG 150 viscosity grade (135 to 165 mm²/s at 40 °C) and lists ASTM test methods with revision years for each property. Confirm the certificate of analysis includes duplicate viscosity determinations, pour point cooling bath details and ISO 17025 lab accreditation. Cross-check sulfur method ASTM D2622 for Group II material to ensure sub-300 ppm detection capability.

What are the BS 150 base oil specification requirements?

BS 150 aligned with ISO VG 150 mandates kinematic viscosity of 135 to 165 mm²/s at 40 °C and minimum 200 °C Cleveland open cup flash point. Other properties including 100 °C viscosity, pour point, color, sulfur and aniline point are supplier dependent unless the purchase contract explicitly adopts Group I or Group II SN 150 limits with their respective ASTM test methods.

What documents are required for BS 150 base oil specification compliance?

A certificate of analysis citing ASTM D445, D2270, D97, D92, D1500 and D2622 with revision years is mandatory for commercial acceptance. For EEA imports above one tonne per year REACH registration under EC 265-157-1 and CAS 64742-54-7 must appear in SDS Section 15. FDA 21 CFR 178.3620 compliance with a Letter of Guaranty is required for H1 or H2 incidental food contact lubricant formulations.

What is the cost of BS 150 base oil and what drives pricing?

Pricing tracks Group I or Group II refinery gate values plus freight and packaging with Group II commanding a premium for higher saturates and lower sulfur. Key drivers include crude slate, hydrotreating capacity utilization, seasonal demand for industrial lubricants and regional supply-demand balance. Contracts typically reference Platt's or ICIS assessments plus a negotiated differential for quality and volume.

Where to find BS 150 base oil specification template for procurement?

Procurement templates are available from major additive suppliers such as Afton, Lubrizol and Infineum who publish blending guides with specification annexes. Industry associations including UEIL and ILMA provide model purchase specifications. Refineries often supply their standard sales specification sheets which can be adapted into a contract annex with agreed precision statements.

What are the typical uses of SN 150 base oil?

SN 150 is widely used in industrial gear oils, hydraulic fluids, circulating oils and metalworking fluids where ISO VG 150 viscosity grade is specified. Group I grades serve general purpose applications while Group II grades are preferred for extended drain intervals and higher oxidative stability requirements. It is also the primary carrier for automotive additive packages in certain regions.

What is the viscosity of SN 150 base oil at 40°C and 100°C?

At 40 °C both Group I and Group II SN 150 fall within the ISO VG 150 range of 135 to 165 mm²/s. At 100 °C Group I typically ranges 4.0 to 4.5 mm²/s while Group II runs slightly higher at 4.2 to 4.7 mm²/s due to its narrower boiling range from hydrotreating. The referee temperature must be stated in the contract to avoid disputes.

Is SN 150 Group I or Group II base oil?

SN 150 is historically a Group I grade defined by less than 90% saturates and over 0.03% sulfur but modern hydrotreating allows the same viscosity cut to qualify as Group II with at least 90% saturates and sulfur below 0.03% according to ExxonMobil Basestocks current API classification. The API group must be specified in the purchase contract because it determines oxidative stability, additive response and regulatory classification.

What test methods apply to SN 150 base oil specifications?

Primary ASTM methods are D445 for kinematic viscosity at 40 °C and 100 °C, D2270 for viscosity index, D97 for pour point, D92 for Cleveland open cup flash point, D1500 for color and D2622 for sulfur. ISO equivalents 3104, 2909, 3016, 2592, 2049 and 8754 are accepted by mutual agreement. The contract must cite exact method numbers and revision years.

Can SN 150 be used for transformer oil formulation?

SN 150 is not suitable for transformer oil formulation which requires uninhibited naphthenic or highly refined paraffinic oils meeting IEC 60296 with extremely low sulfur, specific oxidation stability and gassing tendency limits. SN 150's higher aromatic content and additive response characteristics are designed for lubricating oils not electrical insulating applications.

Sources

Lube Report (Lubes'n'Greases) (2023): Group I share of global base oil production capacity
ExxonMobil Basestocks (current API classification): API Group III viscosity index