HP PARTHAN EP GEAR OIL
150 / 220 / 320 / 460
PREMIUM INDUSTRIAL GEAR OILS
The Complete Guide: Grades, Specs, Applications & How to Choose the Right One
HP PARTHAN EP GEAR OIL
150 / 220 / 320 / 460
PREMIUM INDUSTRIAL GEAR OILS
The Complete Guide: Grades, Specs, Applications & How to Choose the Right One
By Lube Tradeways | Authorized HPCL CFA & Distributor | Chandigarh | www.lubetradeways.com
SEO Title: HP Parthan EP 150/220/320/460 Premium Industrial Gear Oil: Complete Guide | Lube Tradeways
Meta Description: Everything you need to know about HP Parthan EP 150, 220, 320 and 460 industrial gear oils — specifications, IS/AGMA/DIN approvals, grade selection guide, and industry applications. Available from Lube Tradeways, Chandigarh's authorized HPCL distributor.
Focus Keywords: HP Parthan EP gear oil | Parthan EP 220 320 460 | HPCL industrial gear oil Chandigarh | Lube Tradeways
Every maintenance engineer who has worked with industrial gearboxes in India has faced the same decision at some point: which gear oil do you use?
The gearbox in your cement mill, rolling mill, sugar factory, or paper plant is one of the most critical and expensive pieces of equipment in your operation. A gearbox failure is never just a maintenance problem. It is a production stoppage, a safety incident waiting to happen, and a six-figure repair bill that nobody wants to explain to management.
The right gear oil is the single most important factor in preventing that failure. And in India, one name consistently comes up at the top of gear oil recommendations for heavy industrial applications: HP Parthan EP.
Manufactured by HP Lubricants (HPCL), the Parthan EP series is a range of premium quality industrial gear box oils that meet some of the most stringent international and Indian standards in the industry. The grades that appear most commonly in industrial procurement lists are EP 150, EP 220, EP 320, and EP 460 — each designed for a specific viscosity requirement and operating condition.
In this guide, we walk you through everything: what makes Parthan EP special, the difference between the four main grades, which industries use which grade and why, and how to make sure you are getting the genuine product. If you are a plant manager, maintenance engineer, or procurement head at an industrial facility in Punjab, Haryana, or Himachal Pradesh, this guide is written specifically for you.Available at Lube Tradeways: We are an authorized HPCL CFA and Distributor in Chandigarh, stocking HP Parthan EP in all grades and pack sizes. Call +91 84277 70838 or visit www.lubetradeways.com.
What Is HP Parthan EP? The Foundation Explained
HP Parthan EP is a range of extreme pressure (EP) industrial gear box oils manufactured by Hindustan Petroleum Corporation Limited under the HP Lubricants brand. The EP in the name stands for Extreme Pressure — and that is exactly the performance promise these oils deliver.
At the heart of the Parthan EP formulation is a combination of three things:
• selected for their natural oxidation stability and viscosity retention properties: High quality mineral base stocks
• sulfur-phosphorus compounds that activate under high contact pressures to form a protective tribological film on gear tooth surfaces, preventing metal-to-metal contact under shock and heavy loads: Extreme pressure additives
• including antifoam agents to prevent air entrainment, antirust agents to protect internal surfaces during storage and operation, and antioxidation agents to extend oil life: Performance additive package
The result is an oil that does not just lubricate — it actively protects. When two gear teeth come together under heavy load, the EP additives react with the metal surfaces to form a sacrificial protective layer. This layer takes the brunt of the contact stress, preventing the scoring, scuffing, and micro-pitting that destroy gear surfaces over time.
This is not theoretical. HP Parthan EP grades are used daily in some of the most demanding gear applications in Indian industry — from the gearboxes of rolling mills in steel plants to the kiln drives of cement factories. The product has a proven track record backed by decades of field performance and multiple international approvals.
Standards, Specifications & OEM Approvals
One of the strongest reasons industrial buyers trust HP Parthan EP is its extensive list of recognized specifications and approvals. This is not just marketing — each specification represents a rigorous set of performance tests that the oil must pass.
Indian Standards
IS: 8406-1993 is the Bureau of Indian Standards specification for industrial gear lubricants. Parthan EP meets this standard across all grades, making it the right choice for public sector undertakings, government projects, and any procurement governed by BIS specifications.
International Industry Standards
Standard Issuing Body What It Means for You
IS: 8406-1993 Bureau of Indian Standards (BIS) Required for govt/PSU procurement. Parthan EP meets this across all grades.
AGMA 250.04 American Gear Manufacturers Assoc. The benchmark US standard for enclosed gear drive lubricants. Parthan EP meets this.
DIN 51 517 Part 3 (CLP) German Institute for Standards European gear oil standard specifying oxidation, wear & EP performance. Parthan EP compliant.
USS 224 / AIST 224 US Steel / Assoc. for Iron & Steel Legacy US Steel specification — widely required by Indian steel plant procurement teams.
IPSS 1-09-003-82 Indian steel plant standard Required for gear oil procurement at SAIL and other Indian steel plants.
Cincinnati Milacron P-63, P-77, P-35, P-57 Milacron (Machine Tools) Required for machine tool applications where Milacron specifies gear oil grades.
OEM Approvals
Beyond standards, HP Parthan EP carries approvals from actual equipment manufacturers — the companies whose gear drives your plant depends on:
• Parthan EP grades are approved by ABB-ABL for their various industrial equipment installations across India: ABB-ABL Projects
• recommended and approved for use in FMG-manufactured industrial gearboxes: FMG Gearboxes
• approved for Shanti-manufactured industrial gear drives: Shanti Gear BoxWhy Approvals Matter: OEM approvals are not just a stamp of quality. If your gearbox is under warranty and you use a non-approved oil, the manufacturer can deny warranty claims. Always verify OEM specifications before filling — and Parthan EP is pre-cleared for most major Indian industrial gear drive OEMs.
HP Parthan EP 150 vs 220 vs 320 vs 460: What Is the Difference?
All four grades share the same premium EP additive package and pass the same specifications. The difference between them is viscosity — how thick or thin the oil is at operating temperature. ISO VG (Viscosity Grade) is the international classification system: a higher number means a thicker, more viscous oil.
Choosing the right viscosity grade is not a matter of preference — it is an engineering requirement. Here is how to understand each grade:
Grade ISO VG Viscosity @ 40 deg C (cSt) Viscosity @ 100 deg C (cSt) VI (Min) Flash Point (Min) Best For
Parthan EP 150 ISO VG 150 ~135-165 ~14-16 90+ 200 deg C Light industrial gearboxes, faster speeds, lower loads
Parthan EP 220 ISO VG 220 ~198-242 ~19-21 90+ 200 deg C Most common grade: medium-duty enclosed gear drives
Parthan EP 320 ISO VG 320 ~288-352 ~25-28 90+ 210 deg C Heavy industrial gearboxes, cement mills, higher loads
Parthan EP 460 ISO VG 460 ~414-506 ~32-37 90+ 210 deg C Very heavy duty: rolling mills, kiln drives, extreme pressure
Which Grade Should You Use?
The quick answer is: always follow your gearbox OEM manual. But here is a practical field guide for the most common scenarios across Indian industry:
Choose Parthan EP 150 when:
• Your gearbox operates at higher rotational speeds and lighter loads
• The OEM manual specifies ISO VG 150 or AGMA 4 EP grade
• Operating temperatures are moderate (below 60 deg C at the sump)
• You are lubricating smaller, higher-speed industrial gearboxes in light manufacturing
Choose Parthan EP 220 when:
• This is the most widely used grade in India for general industrial purposes
• The OEM manual specifies ISO VG 220 or AGMA 5 EP grade
• You have medium-duty enclosed gear drives running under normal to moderate load
• You need a reliable all-purpose EP gear oil for mixed industrial machinery
• Cement ball mill auxiliary drives, general conveyor gearboxes, pump drives
Choose Parthan EP 320 when:
• The OEM manual specifies ISO VG 320 or AGMA 6 EP grade
• Your gearbox runs under heavy load at moderate speed
• Operating in high-ambient-temperature environments, like North Indian factory floors in summer
• Cement kiln main drives, heavy crusher drives, steel plant conveyor gearboxes, sugar mill drives
• The gearbox housing runs warm and you need a thicker oil to maintain film thickness at temperature
Choose Parthan EP 460 when:
• The OEM specifies ISO VG 460 or AGMA 7 EP grade
• Your application involves very heavy loads, very low speeds, or severe shock loading
• Rolling mill main gearboxes, kiln main drive gearboxes, heavy-duty bucket elevator drives
• Large, slow-moving industrial gears where the oil film must support enormous contact pressures
• Applications where operating temperature is high and a heavy-bodied oil is needed to maintain filmRule of Thumb: When in doubt between two adjacent grades, select the higher viscosity grade (thicker oil) for applications involving heavy loads, high temperatures, or slow speeds. For high-speed, lightly loaded applications, the lower viscosity grade gives better efficiency and less heat generation.
4 Key Benefits That Make HP Parthan EP Stand Out
Superior Anti-Wear Protection
The EP additive system in Parthan EP creates a reactive protective film on gear tooth surfaces under high contact pressure. This is not just ordinary lubrication — it is active surface protection. When two gear teeth come together under load, the sulfur-phosphorus compounds in the additive package react with the metal at the contact point to form a solid lubricating layer of iron sulfide and iron phosphate.
This sacrificial layer takes the stress instead of the metal, preventing the micro-welding and tearing that leads to pitting, scuffing, and ultimately gear tooth breakage. In plain terms: your gear teeth last dramatically longer when protected by a genuine EP oil like Parthan EP, compared to a standard industrial gear oil without EP additives.Field Evidence: Gear manufacturers and maintenance teams across India consistently report extended gear tooth life and reduced maintenance intervals when Parthan EP replaces non-EP or lower-quality EP oils in equivalent applications.
Outstanding Thermal Stability
Heat is the enemy of gear oil. Every degree of operating temperature above the design point accelerates oil oxidation, reduces viscosity, promotes deposit formation, and shortens oil life. Parthan EP's antioxidation additive package significantly retards this process.
The oil delivers dependable performance for continuous service at operating temperatures up to 110 degrees C — which covers the vast majority of industrial gearbox applications in India. Even in North Indian factory environments where ambient temperatures push 45 degrees C in summer, Parthan EP maintains its protective film without thermal breakdown.
This thermal stability also means the oil forms fewer deposits and varnish in the gearbox over time. Mineral gear oils that oxidize quickly leave behind sludge that clogs circulation passages, blocks oil ports, and gradually starves bearings of lubrication. Parthan EP stays cleaner for longer.
Extended Pump and Component Life
An industrial gearbox contains more than just gears. It has bearings — both plain and anti-friction — that support the rotating shafts. These bearings are subjected to shock and heavy loads from the same forces that act on the gear teeth. Parthan EP is formulated to protect these bearings as effectively as the gear teeth themselves.
The antirust additive package prevents corrosion of internal surfaces during oil changes, during periods of standby, and when condensation moisture finds its way into the gearbox — a common occurrence in Indian factories with significant humidity swings between seasons. The antifoam agents prevent air from being whipped into the oil, which would reduce its load-carrying capacity and accelerate oxidation.
The net result is that not just gears, but bearings, seals, and internal passages all last longer with Parthan EP than with lower-quality industrial gear oils.
Excellent Oxidation and Shear Stability
Industrial gear oil has to do something that sounds simple but is actually very challenging: it has to stay the same viscosity grade throughout its service life. Every time oil passes through a gear mesh, the shear forces in the oil try to break down the molecular chains that give it its viscosity. Inferior oils thin out over time, losing the film thickness they need to protect gear surfaces.
Parthan EP uses high quality base stocks with inherently good shear stability, meaning the oil's viscosity does not drop significantly over its service life. Combined with the antioxidation additives that prevent chemical degradation, this means the oil you drain at the end of the service interval is doing nearly the same job as the oil you put in at the beginning.
HP Parthan EP in Action: Industry Applications Across India
HP Parthan EP is the gear oil of choice across virtually every major industrial sector in India. Here is a detailed look at how it is applied in the most common industries across Punjab, Haryana, and Himachal Pradesh:
Cement Plants
Cement manufacturing is one of the most gear-oil-intensive industries in existence. A single cement plant has dozens of major gearboxes: the kiln main drive (one of the largest gearboxes in any industry), ball mill drives, roller press drives, raw mill drives, clinker cooler drives, and multiple conveyor and bucket elevator drives.
The demands on gear oil in a cement plant are severe. Shock loading is constant, ambient temperatures are high, and the plant runs 24 hours a day, 365 days a year. Any gearbox failure means production loss measured in thousands of tonnes.
• Kiln main drive gearboxes: Parthan EP 460 (very heavy loads, slow speeds)
• Ball mill drives: Parthan EP 320 or 460 (heavy shock load, high torque)
• Roller press drives: Parthan EP 320 (high compression loads)
• Conveyor and bucket elevator gearboxes: Parthan EP 220 or 320
Steel Plants and Rolling Mills
Steel is another extreme-duty environment for gear oil. Rolling mill gearboxes handle enormous forces — the force required to reduce hot steel billets to the required section and thickness is staggering. The main pinion gearboxes of rolling mills are among the most severely stressed gear drives in any industry.
Parthan EP meets the IPSS 1-09-003-82 and USS 224 specifications required by SAIL and other major steel plant procurement standards, making it one of the approved choices for steel plant gear drive lubrication.
• Rolling mill main and pinion gearboxes: Parthan EP 320 or 460
• Continuous casting machine drives: Parthan EP 320
• Conveyor and crane gearboxes in steel plants: Parthan EP 220 or 320
• Wire rod and bar mill finishing stands: Parthan EP 220
Sugar Mills
Sugar mills operate seasonally but intensively. The crushing season, typically October to April in North India, runs the plant at maximum capacity for months at a stretch. Gear drives in sugar mills include the main cane mill drive, bagasse conveyors, juice processing drives, and centrifuge drives.
The cane mill drive is particularly demanding — it handles the extremely tough job of crushing fibrous sugarcane stalks with very high torque at low speed. Shock loading is constant and severe.
• Cane mill main drives: Parthan EP 460 (high torque, low speed, severe shock load)
• Diffuser drives: Parthan EP 320
• Bagasse conveyor gearboxes: Parthan EP 220 or 320
• General sugar plant auxiliary gearboxes: Parthan EP 220
Paper Mills
Paper manufacturing requires precision and continuous operation. The main paper machine drives, pulper drives, refiner gearboxes, and press section drives all require reliable, clean gear lubrication. Paper mills are particularly sensitive to oil contamination and deposits, since product quality can be affected by any oil that finds its way into the paper web.
• Paper machine main drives: Parthan EP 220 or 320
• Pulper and refiner gearboxes: Parthan EP 220
• Press section and dryer drives: Parthan EP 150 or 220 (higher-speed sections)
Power Plants and Utilities
Coal handling plant gearboxes, ash handling system drives, cooling tower fan drives, and boiler feed pump drives are all applications where Parthan EP is used routinely in Indian power plants and industrial utilities.
• Coal mill and crusher gearboxes: Parthan EP 320 or 460
• Conveyor gearboxes in coal handling: Parthan EP 220
• ID/FD fan gearboxes: Parthan EP 220 or 320
General Engineering and Manufacturing
Beyond heavy industry, Parthan EP 220 is the workhorse grade for general industrial machinery across all sectors. Machine tool gearboxes, compressor drives, mixer and agitator drives, crane and hoist gearboxes — wherever an enclosed gear drive needs EP-rated lubrication at moderate duty, Parthan EP 220 is the practical, cost-effective, and proven choice.
Maximizing Parthan EP Performance: Maintenance Best Practices
Even the best gear oil will underperform if not maintained correctly. Here are the key practices that Indian maintenance teams should follow to get full value from HP Parthan EP:
Follow OEM-Specified Oil Change Intervals
HP Parthan EP gives dependable performance for continuous service at operating temperatures up to 110 degrees C. A general guideline for drain intervals is 4,000-6,000 hours for standard operating conditions, or once a year whichever comes first. For applications with high operating temperatures, heavy contamination risk, or water ingress, shorten the interval accordingly. Use oil analysis to confirm when the oil actually needs changing, rather than guessing.
Use Oil Analysis to Optimize Drain Intervals
Oil analysis is the most cost-effective maintenance tool available to industrial operators. A sample of oil sent to a laboratory costs a few hundred rupees and tells you the viscosity, acid number, water content, and wear metal concentration in the oil. This data lets you extend drain intervals safely when the oil is still in good condition, and catch problems before they become failures.
Check for Water Contamination
Water is one of the most destructive contaminants in gear oil. Even small amounts of water — as little as 0.1% by volume — significantly reduce the load-carrying capacity of gear oil and promote rust and corrosion on gear surfaces. Check for water contamination visually (milky or cloudy oil is a warning sign) and through periodic oil sampling. Drain contaminated oil immediately and investigate the source of ingress.
Inspect the Breather and Seals Regularly
Most gearbox contamination enters through the breather (which allows air pressure equalization as oil heats and cools) or through worn seals. Replace blocked or damaged breathers with proper desiccant breathers that filter out moisture and dust from incoming air. Inspect shaft seals periodically and replace at the first sign of oil leakage.
Never Mix with Incompatible Oils
Do not mix Parthan EP with oils of a different additive type, particularly those containing active sulphur, molybdenum, or other additive systems that may interact with the EP additive package. If switching from a different brand, drain and flush the gearbox thoroughly before refilling with Parthan EP. For switching between Parthan EP grades (e.g. from 220 to 320 in the same gearbox), mixing is generally acceptable but a drain and refill is always the cleaner option.
Buying HP Parthan EP in Chandigarh: What You Need to Know
HP Parthan EP is widely available across India, but not all sellers are equal. In the Indian lubricants market, counterfeit and adulterated gear oils are a genuine problem. Buying from non-authorized sources means you may be paying for genuine product but receiving something that looks the same but performs very differently.
Here is what to look for and what to avoid:
Buy Only from Authorized HPCL Distributors
Lube Tradeways is an authorized HPCL CFA and Distributor in Chandigarh. Every product we supply is sourced directly from HPCL, with full traceability. We carry HP Parthan EP in all four main grades — 150, 220, 320, and 460 — in the following pack sizes:
• 1 litre and 5 litre cans (for workshop use and small machinery)
• 20 litre tins (standard workshop and maintenance quantities)
• 210 litre barrels (for industrial buyers and plant lubrication programs)
We also supply in bulk for industrial procurement teams that need regular supply under annual rate contracts. If your plant consumes multiple drums per month, talk to us about setting up a supply schedule that reduces your procurement effort and ensures you never run short.Counterfeit Warning: Be very careful with Parthan EP purchased from unknown online sellers or unverified local traders, especially at significantly below-market prices. Adulterated gear oil has destroyed gearboxes in Indian factories. The saving on oil cost is never worth the risk of a gearbox failure.
Frequently Asked Questions: HP Parthan EP Industrial Gear Oil
Q1. What is the difference between HP Parthan EP and HP Parthan EE?
Parthan EP contains extreme pressure additives (sulfur-phosphorus type) designed for gear drives under heavy and shock loads. Parthan EE (Energy Efficient) is a special formulation designed for the same enclosed gear drive applications but with focus on energy savings through reduced internal friction. If your plant has large gearboxes with significant power consumption, Parthan EE may offer measurable energy savings over Parthan EP. For applications where load and wear protection is the primary concern, Parthan EP is the standard recommendation.
Q2. Is HP Parthan EP suitable for worm gear drives?
Standard Parthan EP grades (sulphur-phosphorus type EP additives) are generally not recommended for worm gearboxes with bronze worm wheels. The active sulphur compounds in EP oils can corrode copper and copper alloys, including the bronze commonly used for worm gear wheels. For worm gear applications, use a compounded gear oil (containing fatty acid additives) or a polyglycol-based gear oil like HP Parthan PG series, which is specifically designed for worm gears and is non-corrosive to bronze.Worm Gear Alert: NEVER use standard EP gear oil (including Parthan EP) in a gearbox with a bronze worm wheel unless the manufacturer specifically approves it. The corrosion damage to the bronze wheel can occur within weeks. Use Parthan PG series for worm gears.
Q3. Can I use Parthan EP 220 where the OEM specifies EP 320?
No. Always follow the OEM viscosity specification. Using a lower viscosity than specified means the oil film may not be thick enough to fully separate the gear tooth surfaces under the design load, leading to accelerated surface fatigue, pitting, and potential gear tooth failure. If your OEM specifies ISO VG 320, use Parthan EP 320. The only circumstance where a grade change might be appropriate is if operating temperatures have changed significantly from the design conditions — and even then, consult the OEM or a qualified lubrication engineer first.
Q4. How do I know when Parthan EP gear oil needs changing?
Visual inspection gives you some clues: if the oil appears very dark, milky (water contamination), or has visible particles, it needs immediate attention. For a more reliable assessment, use oil analysis. Send a sample to a certified oil analysis laboratory and check viscosity (should be within 10% of the original grade), acid number (a rising acid number indicates oxidation), water content (should be below 0.05-0.1%), and wear metals. When any of these parameters goes significantly out of specification, it is time to drain and refill.
Q5. Where can I buy HP Parthan EP in bulk in Chandigarh?
Lube Tradeways is the authorized HPCL CFA and Distributor in Chandigarh, stocking HP Parthan EP 150, 220, 320, and 460 in all pack sizes including 210-litre barrels for industrial buyers. We supply to factories, cement plants, sugar mills, steel plants, and engineering companies across Chandigarh, Mohali, Panchkula, and across Punjab and Haryana. Contact us at +91 84277 70838, email [email protected], or visit www.lubetradeways.com to check stock and pricing.
Q6. Does HP Parthan EP protect against rust during gearbox shutdowns?
Yes. The antirust additives in Parthan EP provide protection against corrosion during normal operation and during shutdown periods. However, for extended shutdowns lasting more than 2-3 months, additional protective measures are recommended: ensure the gearbox is fully filled with oil before shutdown (not just the normal operating level), turn the gearbox over periodically if possible to distribute the protective oil film, and consider installing desiccant breathers to prevent moisture ingress during the shutdown period.
Conclusion: The Right EP Gear Oil for Your Plant
HP Parthan EP 150, 220, 320, and 460 represent some of the most thoroughly tested and widely approved industrial gear oils available in India. With certifications meeting IS, AGMA, DIN, USS, IPSS, and Cincinnati Milacron standards, and OEM approvals from ABB, FMG, and Shanti Gearbox, these oils are not a leap of faith. They are a proven choice backed by decades of performance in Indian industry.
The four key benefits that plant managers across India rely on are exactly what the product image says: superior anti-wear protection, outstanding thermal stability, extended pump and component life, and excellent oxidation and shear stability. These are not marketing claims — they are engineering properties that directly translate to longer gearbox life, fewer maintenance interventions, and lower total cost of ownership for your plant.
The only mistake you can make with Parthan EP is choosing the wrong grade, buying from an unauthorized source, or neglecting the maintenance practices that allow the oil to do its job. Get those three things right, and your gearboxes will thank you with years of reliable service.
If you are in Chandigarh, Mohali, Panchkula, Ludhiana, Ambala, or anywhere across Punjab and Haryana, Lube Tradeways is your nearest authorized HPCL source for the complete Parthan EP range. We stock all four grades, offer technical guidance on grade selection, and supply in quantities from single cans to full truckloads.Ready to Order? Call +91 84277 70838 or email [email protected]. We will confirm stock availability, current pricing, and arrange delivery to your plant. No minimum order for standard pack sizes.
Buy HP Parthan EP in Chandigarh
EP 150 | EP 220 | EP 320 | EP 460
Authorized HPCL CFA & Distributor | Chandigarh, Punjab
Plot No. 106, Industrial Area, Phase 1, Chandigarh
+91 84277 70838 | www.lubetradeways.com
[email protected] | [email protected]
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