Synolex Circula S4 SHT 150

Circula S4 SHT 150 – Circulating and Bearing Oil

Product Overview

Synolex Circula S4 SHT 150 is an oil for circulating lubrication and bearing duties that require the stated product family and ISO VG 150 grade. In a circulating system, oil repeatedly travels from the reservoir to the lubricated components and back again. During that journey it supplies the working contacts, carries heat and passes through the circuit filtration arrangement. The lubricant therefore belongs to a complete system rather than a single isolated contact. Its selection should reflect the bearings, any additional lubricated components and the conditions in the common oil circuit.

Product Identification and Grade

Key Features and Benefits

1. Continuous supply to lubricated contacts

A circulating system provides oil to components while they operate. The selected grade must flow through the distribution arrangement and remain appropriate at the bearing. Matching these requirements helps the oil supply serve its intended purpose throughout the working shift.

2. Oil-film support for bearings

Bearings depend on an appropriate lubrication condition for their design, speed and loading. Synolex Circula S4 SHT 150 provides a defined oil selection to compare with those requirements. The lubricant must be considered alongside clearances, alignment and the method used to deliver oil to each bearing.

3. Heat movement through the oil circuit

The oil can carry heat away from the contact and release it through the system cooler or reservoir. Effective circulation is therefore part of temperature management. Adequate flow and functioning cooling equipment remain important to the working conditions experienced by the lubricant.

4. Integration with filtration

Circulating oil passes repeatedly through the system, making contamination control an important part of service. Correct filters, clean transfer and attention to reservoir entry points help protect the circulation path. The lubricant programme should consider the whole route rather than only the condition at the tank.

5. A consistent basis for replenishment

The full Synolex Circula S4 SHT 150 designation helps keep top-ups aligned with the selected service oil. This is especially useful where several reservoirs or nearby machines use similar-looking products. Clear labelling supports stock control and reduces uncertainty during maintenance or shift changes.

6. Application-led performance selection

Some circuits serve bearings alone, while others also include loaded contacts with additional requirements. The product family must match that duty. Viscosity remains essential, but the presence of gears or other heavily loaded components adds a separate performance consideration.

Applications

Synolex Circula S4 SHT 150 is selected with the complete lubricated circuit in mind. Identify the most demanding component sharing the reservoir, not just the largest bearing. The required oil delivery, operating temperature and contact performance determine whether the product fits the installation. The specific series information below clarifies the intended duty within the broader circulating-oil range.

• Central circulating lubrication systems with matching oil requirements.
• Plain or rolling bearings where the machine specifies the relevant oil category.
• Industrial equipment with a common reservoir and controlled oil distribution.
• Marine circulation duties only where the selected product is intended for that service.

Product-Specific Application

This product is intended for a circulating lubrication circuit with the performance requirement indicated by its family. The R&O range addresses rust-and-oxidation-related circulating service, while AW and other specialist designations identify additional application considerations. A shared reservoir may feed more than one component, so the selection should cover all connected duties. The viscosity grade does not establish extreme-pressure performance for a heavily loaded gear contact. Confirm any additional contact requirement before using one oil across a combined circuit.

Viscosity and Grade Selection

The ISO VG 150 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 is a more viscous grade than the lower-numbered industrial grades. Its selection should balance the contact requirement with oil delivery and the operating temperature. 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

The reservoir is more than a storage volume. It forms part of the return, settling and circulation arrangement, while the cooler and filter prepare the oil for another pass through the machine. Changes in return flow or reservoir temperature can therefore affect several components at once. When one bearing runs hot, consider local flow, alignment and loading as well as the lubricant. When several bearings change together, review the common circuit. This distinction helps identify whether the issue belongs to one contact or to the overall oil supply. The selected grade should remain appropriate across the normal operating range of that system.

Handling and Service

Maintain the specified reservoir level and check return flow, filters and coolers during planned service. Observe bearing temperatures at comparable speed and load. Investigate water entry and persistent aeration rather than relying on additional oil to correct them. Keep sampling points consistent so that trends describe the same part of the circuit over time. Use clean transfer equipment for both new fills and routine top-ups.

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 Circula S4 SHT 150 for the circulating-oil or bearing duty that matches its grade and performance category. The product serves a repeated cycle of contact lubrication, heat transport and return through the oil system. This makes it a practical choice to assess wherever several components depend on a dependable common oil supply.

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.