How to Test Organoclay Suspension in paints & Coatings?

Organoclay Suspension Test Method for Coatings | Anti-Settling Performance Evaluation (CP-10).

What is Suspension Performance in Coatings?

In coating and paint systems, suspension performance refers to the ability of a formulation to prevent pigment and filler settling during storage.

A high-performance organoclay forms a stable three-dimensional gel structure, which helps:(How to Test Organoclay Suspension)

• Keep pigments uniformly dispersed
• Prevent hard sediment formation
• Maintain consistent viscosity over time

For formulators, suspension performance is a key factor affecting storage stability and application consistency.

Scope of This Suspension Test Method (How to Test Organoclay Suspension)

This test method is specifically developed for evaluating the anti-settling performance of Organoclay CP-10 in coating systems.

It is applicable to:

• Solvent-based coatings
• Industrial paints
• Pigment dispersion systems

👉 This method introduces 12-hour suspension volume measurement (ml/12h) as a practical indicator of stability.

👉 Traditional viscosity tests (such as xylene viscosity) are not sufficient alone to evaluate long-term suspension behavior in coatings.

Technical Specification for Coating Application

Reference:
Standard sample suspension value: 48 ml/12h

Suspension Test Method for Coatings (CP-10) (How to Test Organoclay Suspension)

Equipment

• 100 ml graduated cylinder (accuracy 0.01 ml)
• High-speed disperser
• Electronic balance (accuracy 0.001 g)

Materials

• Solvent (e.g., WS-3040 or equivalent coating solvent)
• 95% Methanol (activator)
• Standard Organoclay CP-10 sample

Step 1: Preparation of Organoclay Gel

• Add 98 g solvent into a container
• Slowly add 1% organoclay under 1000 rpm, disperse for 2 minutes
• Add 1% methanol activator
• Increase speed to 1500 rpm, mix for 10 minutes

👉 After dispersion, cool to 20–25°C

Step 2: Static Suspension Test

• Transfer the dispersion into a 100 ml cylinder to 50 ml mark
• Seal and keep on a stable surface without vibration
• Record suspension volume after 4, 6, and 12 hours

👉 The 12-hour suspension volume (ml) is used as the final result

Acceptance Criteria

• Acceptable range: 43–48 ml/12h
• Compare with standard sample to ensure consistency

Appearance Evaluation

• Place sample and standard sample powders on white paper
• Flatten evenly
• Observe under natural light

👉 Color should be consistent between batches

Why Suspension Performance Matters in Coatings

In real coating applications, poor suspension leads to:

• Pigment settling during storage
• Hard sediment difficult to redisperse
• Color inconsistency
• Reduced shelf life

Using high-quality organoclay like CP-10 helps achieve:

✔ Excellent anti-settling performance
✔ Stable viscosity over time
✔ Improved storage stability
✔ Better application consistency

Suspension vs Viscosity: What’s the Difference?

Many formulations rely only on viscosity testing, but:

• Viscosity = flow resistance under shear
• Suspension = stability under static conditions

👉 A coating can have high viscosity but still suffer from pigment settling.

That’s why suspension testing provides a more realistic evaluation of long-term stability.

Quality Control & Production Requirements （How to Test Organoclay Suspension?)

• All batches must meet 43–48 ml/12h suspension range
• Products outside this range are not released

If there are changes in:

• Raw materials
• Production process

👉 Customer validation is required before shipment

CP-10 is a kind of organo clay rheological additive. It is used in systems of non-polar to medium polarity aliphatic and other solvents (ketones, ester, ether esters, alcohols, aromatic). 

Properties

Composition                      Organic derivative of a montmorillonite clay

Appearance                       Fine powder,white

Moisture content (105℃,2hr)         ≤3.5%

Loss on ignition (1000℃)            30%-34%

Bulk density                       0.35~0.45g/cm3

Fineness (<74μm, %)               ≥98%

Dispersion fineness (μm)            ≤40

Advantages

• High efficiency
• The gel is of light colour and high clarity
• Easy to use, no need to pregel
• Eliminate polar activator
• Consistent development of rheology
• Can be used to post correct

Application

 CP-10 is used in the following applications:

• Paints
• Putty
• Sealants &adhesives
• Inks
• Cosmetic
• Nano-composite

Need Organoclay for Coatings?How to Test Organoclay Suspension?

We supply high-performance organoclay for coatings and paints, designed for excellent suspension and anti-settling behavior.

👉 Contact us for samples, formulation support, or technical data.

Email:  [email protected]       

Whatsapp: 0086-13185071071

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