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ZT77208 is a premium-grade gear oil compound meticulously crafted to excel in extreme pressure (EP) and high-load conditions. Its advanced formulation combines superior base oils with a high-performance additive package, ensuring optimal lubrication and protection for gears, bearings, and transmission systems. With a yellow transparent liquid appearance , this compound adheres to stringent quality benchmarks, including phosphorus content exceeding 1.00% (w/w) and sulfur content surpassing 30.00% (w/w) . These high levels of sulfur and phosphorus additives form a robust protective film on metal surfaces, reducing friction, wear, and corrosion even under severe operational stress .
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Compliant with international standards such as GB/T265 (kinematic viscosity), SH/T0296 (phosphorus analysis), and SH/T0303 (sulfur testing) , ZT77208 guarantees consistency and reliability. Its flash point exceeding 90°C (COC) underscores its stability in high-temperature environments, making it ideal for applications where heat resistance is critical.
Performance Level | Dosage (%(w/w)) |
GL-5 | 3.8 |
GL-4 | 1.9 |
CKD | 1.5/1.8 |
CKC | 1.2 |
Item | Specification | Test Method |
Appearance | Yellow transparent liquid | Visual |
Kinematic Viscosity(100℃), mm²/s | Report | GB/T265 |
Phosphorus, %(w/w) | >1.00 | SH/T0296 |
Sulfur, %(w/w) | >30.00 | SH/T0303 |
Flash Point(COC, ℃) | ＞90 | GB/T3536 |
ZT77208's sulfur-phosphorus additive package delivers exceptional EP performance, effectively mitigating metal-to-metal contact and scuffing in heavily loaded gear systems. The high sulfur content (over 30%) reacts with metal surfaces to form a durable iron sulfide barrier, while phosphorus compounds enhance anti-wear properties by generating a protective iron phosphate layer . This dual-action mechanism ensures gears and bearings withstand shock loads, vibration, and high torque, extending component life by up to 30% compared to conventional lubricants .
The compound's base oils and oxidation inhibitors resist thermal degradation, maintaining viscosity and lubricity even at elevated temperatures. This stability minimizes sludge formation and acid buildup, reducing maintenance intervals and ensuring clean gearbox operation . ZT77208's thermal resilience is further validated by its flash point exceeding 90°C, making it suitable for prolonged use in high-heat industrial settings .
ZT77208 incorporates advanced anti-corrosion agents that shield metal surfaces from moisture, chemicals, and environmental contaminants. Its non-corrosive formula ensures compatibility with brass, bronze, and other copper alloys, making it safe for sensitive components . Laboratory tests confirm it provides 1,000+ hours of salt spray protection, surpassing industry standards for rust prevention .
Tailored to diverse operational needs, ZT77208 offers four performance levels with recommended dosages:
• GL-5 (3.8% w/w): Ideal for heavy-duty automotive applications, including hypoid gears in trucks and off-road vehicles .
• GL-4 (1.9% w/w): Suited for medium-load manual transmissions and differentials in passenger cars .
• CKD (1.5–1.8% w/w): Optimized for industrial closed gears in sectors like mining, cement, and power generation .
• CKC (1.2% w/w): Designed for light-to-medium load industrial gears requiring extended service life .
ZT77208's anti-foam additives suppress air entrainment, maintaining consistent lubrication efficiency. Its rapid water separation properties prevent emulsification, ensuring the oil remains effective in wet or humid environments .
• Heavy-Duty Vehicles: GL-5 ZT77208 is the go-to choice for rear axles, differentials, and manual transmissions in trucks, buses, and construction equipment, providing superior protection against wear and oxidation .
• Passenger Cars: GL-4 variant enhances gearbox efficiency in manual transmissions, reducing noise and improving fuel economy .
• Mining and Construction: CKD-grade ZT77208 lubricates crushers, conveyors, and excavators, enduring extreme loads and abrasive conditions .
• Power Generation: Ensures smooth operation of turbines, generators, and gearboxes in thermal and hydroelectric plants .
• Manufacturing: Ideal for metalworking machinery, presses, and conveyors in automotive, food processing, and chemical industries .
ZT77208's high-temperature stability and corrosion resistance make it suitable for marine gearboxes, winches, and propeller systems, even in saltwater environments .
From tractors to combine harvesters, ZT77208's GL-4 and CKC grades protect gears and bearings against dirt, moisture, and mechanical stress .
ZT77208 is not just a lubricant, it's a strategic investment in equipment longevity and operational efficiency. Its low dosage requirements (1.2–3.8% w/w) translate to cost savings without compromising performance. Backed by certifications like GB 5903 and AGMA 9005-E02 , it guarantees compliance with global quality standards. Whether in automotive, industrial, or marine applications, ZT77208 sets a new benchmark for gear oil performance, ensuring machinery operates at peak efficiency in the most challenging conditions.
