SC vs SL: Understanding Suspension Concentrates and Soluble Liquids in Pesticides

In modern pesticide formulation technology, the formulation type plays a critical role in determining efficacy, safety, and environmental impact. With the advancement of agricultural science and the increasing awareness of green farming, choosing the right pesticide formulation has become essential for achieving effective pest control and stable crop yield.Among various formulations, Suspension Concentrates (SC) and Soluble Liquids (SL) are the most widely used water-based types. They differ in physical properties, application methods, and target crops, each offering unique advantages. Understanding these differences allows farmers and agronomists to select the optimal formulation for maximum effectiveness.

What is a Suspension Concentrate (SC)?

Definition

A Suspension Concentrate (SC) is a liquid formulation in which insoluble solid active ingredients are finely ground and uniformly dispersed in water to form a stable suspension. The active ingredients exist as micro-sized solid particles evenly distributed in the liquid, providing consistent and long-lasting efficacy.

Composition

Active Ingredient: The core substance responsible for pest or disease control.

Dispersants, Wetting Agents, and Anti-settling Agents: Ensure uniform particle distribution and prevent settling.

Water: Acts as a carrier, environmentally friendly and cost-effective.

Features

Environmentally friendly: No organic solvents, minimal VOC emissions.

Dust-free: Safer and easier to handle than wettable powders (WP).

Stable efficacy: Uniform particle dispersion ensures slow release of active ingredients.

Suitable for poorly water-soluble pesticides.

Typical Products

25% Azoxystrobin SC: Broad-spectrum fungicide with long-lasting efficacy.

480g/L Clodinafop-propargyl SC: Efficient herbicide with reliable weed control.

What is a Soluble Liquid (SL)?

Definition

A Soluble Liquid (SL) is a transparent or semi-transparent liquid formulation in which water-soluble active ingredients are completely dissolved in water or mixed solvents. SL formulations are easy to use—simply dilute with water, no stirring required.

Composition

Water-soluble Active Ingredients: Ensure uniform efficacy upon dilution.

Solubilizers and Stabilizers: Maintain solubility and prevent precipitation.

Water or Alcohol-based Solvent: Ensures transparency, safety, and stability.

Features

Easy to use: Transparent solution allows easy monitoring during spraying.

Stable: No sedimentation or separation after dilution.

No equipment clogging: Ideal for sprayers and foliar application.

Suitable for water-soluble pesticides and plant growth regulators.

Typical Products

360g/L Glyphosate SL: Broad-spectrum systemic herbicide, quickly absorbed by plants.

280g/L Alkyl Ethyl Sulfonate SL: Plant growth regulator with excellent solubility and stability.

Key Differences Between SC and SL

Applications

SC Applications

Foliar disease control: Forms a protective layer on leaves, slow release of active ingredients.

Soil treatment: Penetrates soil to control soil-borne diseases and underground pests.

Crops: Rice, wheat, vegetables, fruit trees.

Methods: Spraying, irrigation, seed treatment.

SL Applications

Rapid pest control: Quickly absorbed by plants for fast action.

Growth regulation: Precisely regulates plant growth processes.

Crops: Cotton, soybeans, fruit trees, and other cash crops.

Methods: Spraying, foliar application.

Conclusion

Suspension Concentrates (SC) emphasize stability and long-lasting efficacy, making them ideal for poorly soluble active ingredients and prolonged control. Soluble Liquids (SL) highlight solubility and convenience, suitable for rapid action and water-soluble products