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Crop Care
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  1. Home
  2. Products & Applications
  3. Concentrated Aqueous Emulsion (EW)

Concentrated Aqueous Emulsion (EW)

They can be considered as a safer and more environmentally friendly alternative to emulsifiable concentrates (EC). In an EW the continuous phase is water (as opposed to an organic solvent for ECs) which offers the benefit of lower phytotoxicity, no flashpoint concern, ease of handling, and a lower environmental impact.

EW formulations are physically stabilised by specifically identified polymeric surfactants incorporated at an appropriate level. The emulsion has already been established in the formulation and is only diluted further in the spray mixture.

EW formulation diagram
The Formulator's Toolbox
The Formulator's Toolbox

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Benefits

  • Simple to manufacture
  • Relatively high biological activity
  • Good chemical stability
  • Spontaneous emulsification upon dilution

Limitations

  • Use expensive solvents containing harmful VOCs
  • Solvents may affect plastics and rubbers in spray applicators
  • Active ingredients needs to be fully soluble in the solvent over a range of temperatures
  • Use of water miscible solvents can cause active ingredient crystallisation problems upon dilution

Products Recommended for EW

  • High HLB Emulsifier
  • Low HLB Emulsifier
  • Organic Solvent
  • Rheology Modifier

High HLB Emulsifier

We recommend the combination of a low and high HLB polymeric surfactant to obtain EW formulations with excellent, long term stability. This surfactant combination ensures that the formulation maintains stability over a range of application temperatures.

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Atlas™ G-5004 LD

Block copolymer

A demineralised version of Atlas™ G-5002L. It is used as a high HLB emulsifier for active ingredients that are sensitive to mineral presence.

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Atlas™ G-5002L

Polyalkylene oxide block copolymer

A high HLB polymeric emulsifier or wetting agent in liquid form providing long term stability It is commonly used in combination with Atlox™ 4916.....

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SP Tween™ 22 MBAL

Polyoxyethylene (8) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications The significantly reduced equilibrium surface tension.....

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SP Tween™ 23 MBAL

Polyoxyethylene (12) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications Improved performance identified with various hydrophilic.....

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SP Tween™ 24 MBAL

Polyoxyethylene (16) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications Strong all round performing adjuvant and strategic.....

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Low HLB Emulsifier

We recommend the combination of a low and high HLB polymeric surfactant to obtain EW formulations with excellent, long term stability. This surfactant combination ensures that the formulation maintains stability over a range of application temperatures.

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Atlox™ 4916

High molecular weight polymer

A low HLB polymeric emulsifier and non-aqueous dispersant with a unique star structure which provides exceptional stability As an emulsifier it is.....

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Atlox™ 4914

Nonionic random polymeric

A nonionic random polymeric surfactant with low HLB value which can be used as an emulsifier or non-aqueous dispersant Multiple PEG anchoring groups.....

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Organic Solvent

In an EW formulation the active ingredient must be fully soluble in the carrier solvent. If the active ingredient is solid, it will need to be dissolved in a solvent. Croda’s Seatons Natural Oil range are 100% natural and renewable, which make them a great choice for use in crop care formulations.

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Seatons refined linseed oil

Linseed oil

Seatons refined linseed oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Seatons refined rapeseed oil

Rapeseed oil

Seatons refined rapeseed oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Seatons refined soyabean oil

Soyabean oil

Seatons refined soyabean oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Rheology Modifier

If an EW is not properly structured, the formulation can breakdown resulting in the oil phase creaming to the surface. This leads to reduced shelf life stability and poor performance in the field. The inclusion of a rheology modifier helps overcome this issue by increasing the viscosity of the formulation, providing improved stability.

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Atlox Rheostrux™ 300A

Polyquaternium 37 emulsion

Rheology modifier designed for aqueous formulations Excellent performance seen in acidic conditions necessary for certain active ingredients.....

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Formulation Finder

Formulation Finder

Browse our range of fully developed formulations for inspiration and guidance.

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Experimental Design Tool

Experimental Design Tool

This tool enables you to methodically calculate surfactant ratios meaning the number of experiments are kept to a minimum.

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The Formulator's Toolbox

The Formulator's Toolbox

View our in-depth training guides about how to develop different formulation types.

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  • Adjuvants
  • Capsule Suspension (CS)
  • Emulsifiable Concentrate (EC)
  • Flowable Concentrates for Seed Treatment (FS)
  • Microemulsions (ME)
  • Oil Dispersion (OD)
  • Suspension Concentrate (SC)
  • Suspoemulsion (SE)
  • Water Dispersible Granule (WDG)
  • Wettable Powder (WP)
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