---
title: "Cst"
description: "Centistoke"
url: "https://oceancargo.co.uk/shipping-terms/cst"
date: "2026-05-02T12:10:46+00:00"
language: "en-GB"
---

![Ocean Cargo](https://oceancargo.co.uk/images/GenPics/OCs-Customs-Brokerage.webp)

 # CST / Centistoke: Understanding Viscosity in Freight and Shipping

## What is Centistoke (CST)?

In the world of freight and shipping, particularly when dealing with liquid cargo, understanding the properties of the substances being transported is paramount. One critical property is viscosity, and its most common unit of measurement is the Centistoke (CST). Viscosity refers to a fluid's resistance to flow – essentially, how "thick" or "thin" it is. A fluid with a high CST value is thick and flows slowly (like treacle), while a fluid with a low CST value is thin and flows easily (like water).

The term "Centistoke" is derived from the CGS (centimetre-gram-second) system of units. One Centistoke is equal to one square millimetre per second (mm²/s). This measurement is crucial for various aspects of logistics, from selecting the right pumps and pipelines for loading and unloading to ensuring the stability and safety of the cargo during transit. For Ocean Cargo, understanding and managing the viscosity of liquid shipments is a core part of our commitment to secure and efficient [sea freight services](https://oceancargo.co.uk/services/sea-freight/).

## Why is Centistoke (CST) Important in Freight Forwarding?

The viscosity of a liquid, measured in Centistokes, has far-reaching implications across the entire shipping process. Ignoring this critical property can lead to operational inefficiencies, increased costs, and even safety hazards. Here’s why CST is so vital:

- **Equipment Selection:** Pumps, hoses, and pipelines used for loading and unloading liquid cargo are designed for specific viscosity ranges. Using equipment incompatible with the liquid's CST can lead to pump failure, burst hoses, or extremely slow transfer rates.
- **Loading and Unloading Times:** High-viscosity liquids flow much slower. This directly impacts the time required to load and unload vessels or tanks, potentially leading to demurrage charges and delays in the supply chain.
- **Temperature Control:** Viscosity is highly temperature-dependent. Many viscous liquids become less viscous (flow more easily) when heated. Maintaining specific temperatures during transit and transfer is often necessary, requiring specialised heating equipment on tanks and vessels.
- **Cargo Stability and Sloshing:** While less direct, the viscosity can influence how a liquid behaves within a tank during transit. Extremely low viscosity liquids can slosh more violently, potentially affecting vessel stability.
- **Cleaning Procedures:** Tanks that have carried high-viscosity liquids often require more intensive and specialised cleaning procedures, which adds to turnaround time and cost.
- **Regulatory Compliance:** Certain hazardous or sensitive liquids may have specific handling requirements based on their physical properties, including viscosity, to comply with international shipping regulations.

Ocean Cargo's expertise in handling diverse liquid cargoes means we meticulously consider CST values to ensure every aspect of your shipment is managed with precision, from initial planning to final delivery.

## How Centistoke (CST) Affects Different Liquid Cargoes

The range of liquids transported globally is vast, and their CST values vary dramatically. Understanding these differences is key to effective logistics planning:

### Petroleum Products

- **Crude Oil:** CST values vary widely depending on the crude's origin. "Heavy" crude oils have high CST values and often require heating for efficient pumping and transport. "Light" crude oils have lower CST values.
- **Fuel Oils (Bunker Fuel):** These are typically high-viscosity products, especially at ambient temperatures. They almost always require heating to be pumped and used effectively, both for bunkering vessels and for power generation.
- **Diesel and Kerosene:** These are much lighter and have lower CST values, flowing easily at ambient temperatures.

### Chemicals and Solvents

- **Acids and Alkalis:** Viscosity varies. Some concentrated acids can be quite viscous, while others are very fluid.
- **Solvents:** Generally have low CST values, making them easy to pump and handle.
- **Resins and Polymers:** Often have very high CST values, sometimes requiring significant heating and specialised equipment for handling.

### Food-Grade Liquids

- **Vegetable Oils:** CST values vary but are generally moderate. They can become more viscous in colder temperatures.
- **Molasses and Syrups:** These are classic examples of high-CST liquids, requiring heating and powerful pumps for efficient transfer.
- **Juices and Dairy:** Typically low CST, similar to water, but require strict temperature control for preservation.

Whether you're shipping [excavators and diggers to the UAE](https://oceancargo.co.uk/countries/uae/excavators-diggers-uae) or a tanker full of chemicals, Ocean Cargo provides tailored solutions. Our team assesses the specific properties of your cargo to mitigate risks and optimise the shipping process, ensuring compliance with all relevant regulations, including those for [customs compliance](https://oceancargo.co.uk/services/customs-compliance/).

## Measuring and Specifying CST for Shipping

Accurate measurement and clear specification of a liquid's Centistoke value are fundamental for any freight forwarder. Here's how it's typically handled:

### Viscometers and Testing

Viscosity is measured using devices called viscometers. There are various types, including rotational viscometers, capillary viscometers, and falling ball viscometers. The method chosen depends on the liquid type and the required precision. Crucially, viscosity measurements are always taken at a specific temperature, as temperature significantly impacts the result. For example, a product might be specified as "100 CST at 40°C."

### Documentation and Communication

When arranging a shipment of liquid cargo, the CST value (along with the measurement temperature) must be clearly communicated to the freight forwarder and the carrier. This information is typically included in the Material Safety Data Sheet (MSDS) or Product Data Sheet (PDS) provided by the shipper. This allows Ocean Cargo to:

- Select the appropriate vessel or tank container.
- Advise on necessary heating requirements.
- Coordinate with port operators for suitable pumping equipment.
- Plan for efficient loading and unloading schedules.

Our proactive approach ensures that all parties involved in your supply chain are fully informed, preventing costly delays and ensuring the safe handling of your goods, whether it's a standard shipment or complex [wind turbine components to Australia](https://oceancargo.co.uk/countries/australia/wind-turbine-components-blades-nacelles-tower-sections-australia).

#### What is the difference between Centistoke and Centipoise?

Centistoke (cSt) measures kinematic viscosity, which is a fluid's resistance to flow under gravity. Centipoise (cP) measures dynamic (or absolute) viscosity, which is a fluid's resistance to flow when a force is applied. The relationship between them is: Kinematic Viscosity (cSt) = Dynamic Viscosity (cP) / Density (g/cm³). For shipping, Centistoke is more commonly used as it directly relates to how a fluid flows through pipes and pumps.

#### Does temperature affect Centistoke (CST) values?

Absolutely. Temperature has a significant impact on a liquid's viscosity. Generally, as temperature increases, the viscosity of a liquid decreases (it becomes thinner and flows more easily). Conversely, as temperature decreases, viscosity increases. This is why CST values are always specified at a particular temperature (e.g., 50 CST at 40°C).

#### Can Ocean Cargo handle high-viscosity liquid shipments?

Yes, Ocean Cargo has extensive experience in managing a wide range of liquid cargoes, including those with high Centistoke values. We work with a network of carriers and port facilities equipped with the necessary heating capabilities, specialised pumps, and handling procedures to ensure the safe and efficient transport of viscous liquids. Our team provides expert advice on all aspects of your liquid cargo logistics.

#### What information do I need to provide about my liquid cargo's CST?

To ensure a smooth shipping process, you should provide the Centistoke (CST) value of your liquid cargo, along with the temperature at which that measurement was taken. This information is typically found on the product's Material Safety Data Sheet (MSDS) or Product Data Sheet (PDS). Any specific heating or handling instructions should also be communicated.

### Ready to simplify your global logistics?

Get advice and a quote for your next shipment. Contact the Ocean Cargo team to start shipping.

[Freight Quote](https://oceancargo.co.uk/contact-us)

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