Synolex Vacuum S4 VDL 46

Vacuum S4 VDL 46 – Vacuum Pump Oil

Product Overview

Synolex Vacuum S4 VDL 46 is a vacuum-pump lubricant for oil-lubricated pumps with a matching ISO VG 46 grade and documented fluid requirement. In vacuum service, the oil can contribute to lubrication, sealing and heat transport according to the pump design. It also encounters the gases and vapours entering the pump. The product is therefore selected for both the mechanical lubrication duty and the vacuum process, rather than treating it as an ordinary compressor oil with a similar viscosity.

Product Identification and Grade

Key Features and Benefits

1. Lubrication of internal moving parts

The oil supplies the moving contacts included in the pump lubrication design. An appropriate grade helps maintain the required oil-film condition while the mechanism operates. The pump model and its delivery arrangement determine how this lubricant reaches the relevant surfaces.

2. Support for the pump sealing function

In designs that use oil as part of the internal sealing arrangement, the fluid contributes to the working clearances needed for pumping. The required viscosity and fluid properties should be matched to that design. Oil identity is therefore relevant to pumping performance as well as component lubrication.

3. Heat transport during pumping

The lubricant can carry heat from internal contacts through the pump oil system. Normal operating temperature is an important part of the fluid assessment. Cooling conditions, duty cycle and incoming process load should be considered alongside the grade when reviewing pump behaviour.

4. Selection for the required vacuum duty

Vacuum applications require attention to fluid properties beyond viscosity, including the relevant vapour behaviour. Synolex Vacuum S4 VDL 46 should be compared with the pump manufacturer specification for the intended duty. A shared grade does not establish that an air-compressor oil is an equivalent vacuum-pump fluid.

5. Consideration of incoming vapours

Process vapours and condensate can alter the condition of the service oil. The lubricant programme should therefore reflect what the pump handles, not only its running hours. Suitable process protection and the pump operating procedure work together with the selected fluid.

6. A consistent service reference

The full product designation links the pump, oil stock and maintenance history. Recording oil changes and top-ups against that reference supports useful comparison of pump temperature, oil condition and the ability to achieve the required process vacuum.

Applications

Use Synolex Vacuum S4 VDL 46 after matching the pump model, required vacuum duty and incoming process stream. The specification should identify the necessary oil properties and any restrictions associated with the process. Where a gas-ballast arrangement or other operating feature is fitted, use it only in accordance with the pump instructions and the application requirement.

• Oil-lubricated vacuum pumps with a compatible fluid specification.
• Industrial vacuum service within the confirmed pump and product application.
• Scheduled pump-oil changes and controlled replenishment.
• Process installations where incoming gases and vapours have been assessed.

Viscosity and Grade Selection

The ISO VG 46 designation identifies the nominal viscosity class at the 40°C reference temperature. It is a grade reference, not a measured typical property for an individual batch and not the maximum operating temperature. This grade is used as a defined viscosity reference within the product family. Its suitability depends on the oil requirement of the specific equipment, not on the popularity of the grade. As oil temperature changes, its viscosity changes too. The operating requirement therefore includes both starting conditions and the temperature reached during normal service. Use the current product data sheet to review the actual viscosity and any other properties required for the application. A different series with the same grade can still have a different intended duty. Keep the full product designation when comparing alternatives or placing an order, and use the equipment specification to decide whether a neighbouring grade is appropriate.

Performance in the Application

A pump can appear mechanically healthy while struggling with a process load different from the one for which its oil programme was established. Incoming vapour, operating temperature and the frequency of atmospheric exposure can affect oil condition. A useful assessment therefore records the process alongside the pump. When performance changes, consider leakage, process loading and maintenance condition as well as the lubricant. This avoids assigning every vacuum problem to oil viscosity. The service fluid should remain matched to the pump specification throughout normal operation and any planned change in process conditions.

Handling and Service

Maintain the specified level and follow the pump procedure for draining and refilling. Check for changes in oil appearance, consumption and operating temperature. Investigate water or condensate entry and ensure any fitted separation or protection equipment remains functional. After servicing, assess the pump under a comparable process load. Keep new oil protected from contamination and moisture.

Store the product in its original labelled container in a clean, covered area. Close the container after dispensing and use dedicated, clean transfer equipment. Protect the product from water and debris and keep batch identification legible. Follow the safety data sheet for handling and spill management, and manage used product through the applicable collection arrangements.

Why Choose This Product?

Choose Synolex Vacuum S4 VDL 46 for a vacuum pump whose mechanical and process requirements match the product. The lubricant serves the oil-dependent functions of the pump, including lubrication and the sealing or cooling roles provided by its design. Correct matching brings the pump and incoming process conditions into the same fluid selection.

Product Selection and Ordering

For product selection or an order, provide the complete Synolex designation, the equipment or process application and the quantity required. Where a replacement is being considered, include the current lubricant name and the relevant equipment requirement. This allows the proposed product to be compared on application and documented properties. The current technical data sheet governs numerical specifications and any formal approvals. The comparison section below retains the product references and their qualifications, so that a potential alternative can be reviewed in its proper technical context.

Similar Products (Equivalent Matching)

The entries below support technical comparison. A documented comparator does not establish an automatically approved replacement. Conditional alternatives require the stated differences to be resolved. A family-level lead does not verify the exact grade, and the absence of a verified entry does not mean that no product exists in the market.