Description
VpCI®-326 is an oil-based additive concentrate that upgrades the hydraulic, lubricating or preservative oil already in a system for standby and shutdown periods. It is the Cortec oil additive that will pass through a 1-micron filter, so it can go into hydraulic circuits with fine filtration without plugging elements. It is NATO and NSN listed, nitrite-free, thermally stable and has an exceedingly high flash point for in-plant safety.
Hydraulic systems that sit idle corrode above the fluid line in the reservoir, in cylinders parked with rod retracted and in valve bodies where moisture collects. VpCI-326 protects ferrous and non-ferrous metals in both the liquid and the vapor phase, and it can also be fogged into the interior of drained reservoirs and housings at 1 fl oz per cubic foot. It carries NSN 6850-01-470-3358 and NATO stock number 6850-66-132-6100 and is a commercial equivalent to MIL-PRF-46002C and MIL-I-85062. In the Cortec Product Consultation Guide VpCI-326 is rated 3, outside sheltered storage, on carbon steel, stainless steel, cast iron, aluminum alloys, galvanized steel, copper, brass and solder; it is not intended for uncovered outdoor exposure.
Typical applications
- Hydraulic oil systems
- Gearbox assemblies
- Fogging interiors of enclosed spaces
- Upgrading existing lubricants for standby and shutdown periods
- Servo and proportional-valve hydraulic circuits with 1-micron filtration
- Hydraulic power units on mobile, marine and defense equipment
- Circulating oil systems being prepared for seasonal shutdown
- Drained reservoirs and housings preserved by fogging
How to apply VpCI-326
- Check compatibility. Cortec’s oil compatibility chart lists VpCI-326 as compatible at 10 % in the gear, transmission and turbine oils it has tested, and as not compatible with one synthetic gear oil. Blend a sample of your fluid before dosing.
- Dose the system. Add VpCI-326 to the reservoir at 5 to 20% by weight (Cortec Technical Service; use the high end of the range for longer lay-up or harsher conditions), then cycle the system so the treated oil reaches every circuit. Because it passes a 1-micron filter there is no need to bypass filtration.
- Wet or dry lay-up. Leave the treated fluid in place or drain it; the vapor phase inhibitors continue to protect the drained interior.
- Fogging. For drained reservoirs, gearboxes and housings, seal all but two openings and fog VpCI-326 through the low port at 1 fl oz per cubic foot (1 liter per cubic meter) of enclosed space until mist reaches the exhaust port, cap the exhaust, complete the dose and seal.
- Return to service. No removal or flush is required.
- Storage. Keep sealed and mix before use.
Compatibility
VpCI-326 works in mineral and synthetic hydraulic and lubricating oils. Cortec’s oil compatibility chart shows it compatible at 10 % in the gear, transmission and turbine oils tested and not compatible with one synthetic gear oil, so a blend test is the rule for any fluid not on the chart. See the full oil and elastomer compatibility charts.
Where it fits in the Cortec line
VpCI-326 is the hydraulic specialist. VpCI-329 is the general-purpose oil concentrate with adjustable 1:19, 1:9 and 1:4 ratios for gearboxes and crankcases; VpCI-322 is the fixed 1:9 concentrate rated 24 months for pumps, compressors and gearboxes in lay-up. For turbine and gear oils where demulsibility and a non-staining film matter, use M-531; for engine oils in intermittent service, M-529. Browse the full Cortec VpCI line.
Field notes
A private pilot in Oshkosh, Wisconsin winterized the 180 hp engine of a restored 1965 amphibious airplane per the engine maker’s service letter: 26 oz of VpCI-326 in 8 quarts of oil (1:10), the engine run briefly and shut down, with extra mix sprayed into the cylinders after five months. (Cortec Case History #254)
A state-owned deepwater drilling contractor in Vietnam cold-stacked a rig with a full treatment schedule: VpCI-326 and VpCI-329 at 20% and M-531 at 5% in gearboxes, mud pumps and engines; VpCI-705 at 100 ppm in fuel; VpCI-649 BD at 0.5% in fresh-water systems; and VpCI-308 and VpCI-609 fogged into empty tanks and pipelines. (Cortec Case History #575)
A French gear-reducer maker had precision reducers rusting in shipment, and filling the cases with oil was costly and shipped as hazardous freight. VpCI-329 is now poured into the gearcase at only 0.3% of case volume, with CorShield VpCI-369 on the exterior: up to 48 months of protection, no oil fill and non-hazardous freight. (Cortec Case History #599)
Specifications
| Fogging rate | 1 liter/m³ (1 oz/ft³) of enclosed space |
|---|---|
| Use | Dilute with lubricating, hydraulic or preservative oils |
| Treat rate in oil | 5–20% by weight (Cortec Technical Service) |
| Limitation | Not for applications where the oil may contact liquid water |
| Filtration | Passes through a 1-micron filter |
| Phases protected | Liquid and vapor |
| Metals | Ferrous and non-ferrous – carbon steel, stainless steel, cast iron, aluminum, galvanized steel, copper, brass, solder |
| Consultation guide rating | 3 – outside sheltered storage |
| Composition | No hazardous chromates, nitrites or phosphate inhibitors; nitrite-free and thermally stable |
| Flash point (ASTM D92) | 280 °F (138 °C) |
| Viscosity | 19.2 cSt at 40 °C; 3.6 cSt at 100 °C |
| Pour point | −33 °F (−36 °C) |
| Safety | Exceedingly high flash point |
| Listings | NATO and NSN approved |
| Stock numbers | NSN 6850-01-470-3358; NATO 6850-66-132-6100 |
| Standards | MIL-PRF-46002C and MIL-I-85062 (commercial equivalent) |
| Removal | Not required |
| Size | 5 Gallon Pail |
| Shipping weight | 39.5 lb (17.9 kg) |
| Availability | In stock |
| Cortec product number | 12100269 |
Solvent Recycling Systems is an authorized Cortec® distributor. See the full Cortec VpCI line, browse the VpCI product selection guide, or contact us for volume pricing and lead times.
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