Lubricants & Metalworking — EP Additive Package
Gear Oil Additive
Sulfur-Phosphorus EP — AGMA / API GL-4 / GL-5
Sulfur-phosphorus EP additive package for formulating AGMA industrial and API GL-4/GL-5 automotive gear lubricants. Treat rate 5–15% in finished fluid. Copper passivator included.
EP Chemistry
Sulfur-Phosphorus
Treat Rate
5–15% in finished fluid
Specifications
AGMA / GL-4 / GL-5
Pack Sizes
Drums · Totes · Pails
Additive Components
Sulfur-phosphorus EP additive package — treat rate 5–15%
Safety & Regulatory
- NFPA Health
- 2 — Moderate hazard
- NFPA Flammability
- 1 — Slight hazard
- NFPA Reactivity
- 0 — Stable
- OSHA PEL (vapor)
- Consult SDS for specific components
- DOT Hazard Class
- Not regulated (non-flammable)
- Skin/Eye Contact
- Irritant — wear gloves and safety glasses
- Copper Compatibility
- Controlled via copper passivator
Grades & Packaging
Available Grades
Pack Sizes
Also Known As
Physical & Chemical Properties
| Product Type | Sulfur-phosphorus EP additive package |
| Treat Rate | 5–15% in finished fluid (application-dependent) |
| Appearance | Amber to dark amber liquid |
| Specifications Supported | AGMA 9005, API GL-4, API GL-5, MT-1 |
| EP Agent | Active sulfur + phosphorus (S-P chemistry) |
| Copper Corrosion | Controlled — copper passivator included |
| Foam Control | Silicone-based foam inhibitor included |
| Rust Protection | Rust inhibitor included |
| Flash Point | Above 100 °C (212 °F) |
| Density | ~0.95 g/cm³ at 15 °C |
| Viscosity (neat) | ~50–150 cSt at 40 °C |
| Sulfur Content | Active sulfur — EP performance |
Industrial Applications
Industrial Gear Oil Formulation
Gear oil additive packages are used by lubricant blenders formulating industrial gear oils (ISO 68–680, AGMA 1–9) for enclosed gearboxes, worm drives, and industrial drive systems across Texas.
Automotive Gear Lubricant Formulation
Used to formulate API GL-4 and GL-5 automotive gear lubricants (75W-90, 80W-140) for manual transmissions, transaxles, and hypoid axle differentials.
Mining & Aggregate Processing
Heavy-duty EP gear oils formulated with this additive package protect the large gearboxes and drive systems used in mining, quarrying, and aggregate processing equipment.
Wind Energy
Specialized gear oil additive packages are used in wind turbine gearbox lubricants, a growing application in Texas wind energy operations across West Texas and the Panhandle.
Marine Gear Oil
Used to formulate marine gear oils for ship propulsion gearboxes, stern tube bearings, and deck machinery requiring EP protection in marine environments.
Worm Gear Oil
The copper passivator in this additive package is critical for worm gear oil formulation, protecting the bronze worm wheel from corrosion by active sulfur EP agents.
Why Source Gear Oil Additive from Texas-Chem?
- Sulfur-phosphorus EP chemistry — meets AGMA 9005, API GL-4, and API GL-5 specifications
- Copper passivator included — protects bronze and brass components in worm gears and transmissions
- One package, multiple grades — formulate ISO 68 through ISO 680 industrial gear oils
- SDS, COA, and technical data sheets on every order
- Nationwide delivery from Fort Worth, TX — drums and totes
Frequently Asked Questions — Gear Oil Additive
What treat rate should I use for industrial gear oil formulation?▾
For ISO 68–220 industrial gear oils (AGMA 2–5), a treat rate of 5–8% is typical. For ISO 320–680 heavy industrial gear oils (AGMA 6–9) and API GL-5 automotive gear lubricants, 10–15% treat rate is used. The higher treat rate provides the additional EP performance required for hypoid gear applications. Contact Texas-Chem at 855-TEX-CHEM for formulation guidance.
What is the difference between API GL-4 and GL-5 gear lubricants?▾
API GL-4 is specified for manual transmissions and transaxles with moderate EP requirements. API GL-5 is specified for hypoid axles and differentials with high EP requirements — it contains more active sulfur and phosphorus than GL-4. GL-5 lubricants can be corrosive to yellow metals (brass, bronze) in some transmissions — check OEM specifications before using GL-5 in a GL-4 application.
Can this additive package be used for worm gear oil formulation?▾
Yes. The additive package is suitable for formulating AGMA 9 EP worm gear oils when blended with appropriate base oil. Worm gear oils require good EP performance and copper corrosion control — the built-in copper passivator in this package addresses the copper corrosion concern from the bronze worm wheel.
What base oil should I use with this additive package?▾
Group I or Group II paraffinic base oil is the standard base stock for gear oil formulation with this additive package. The base oil viscosity grade is selected to achieve the target ISO viscosity grade in the finished fluid. Texas-Chem supplies both the base oil and the additive package for a complete gear oil formulation solution.