CP-908 is a white-powder organophilic clay producing a colorless, high-clarity thixotropic gel in low to medium polarity organic solvent systems. The white appearance distinguishes it from standard light-yellow organoclay grades, making CP-908 the preferred choice for color-sensitive applications including white industrial coatings, near-white cosmetic formulations, and light-tinted paint systems. Performance characteristics are equivalent to other low-to-medium polarity grades — anti-settling, anti-sagging, and thixotropy — with the additional benefit of color neutrality.
Technical Properties
| Parameter | Specification | Test Method |
|---|
| Chemical composition | Organic derivative of montmorillonite clay | — |
| Appearance | Fine powder, white | Visual |
| Moisture content | ≤ 3.5% | 105°C, 2 hours |
| Loss on ignition (LOI) | 29–32% | 1000°C |
| Bulk density | 0.53 g/cm³ | — |
| Fineness | ≥ 98% passing 74 μm (200 mesh) | Sieve analysis |
| Gel appearance | Colorless, high clarity | Visual |
Applications and Dosage
| Application | Typical Dosage | Polarity Range |
|---|
| Paints & coatings (low to medium polarity) | 0.3–1.2 wt% | Aliphatic, mild aromatic |
| Lubricating grease | 8–15 wt% | Mineral/synthetic base oil |
| Printing ink | 0.5–2.0 wt% | Oil/solvent-based ink vehicles |
| Sealants and adhesives | 0.5–2.0 wt% | Low to medium polarity |
| Cosmetics (anhydrous) | 1.0–5.0 wt% | Oils, esters |
| Oil-based drilling mud | 5–12 kg/m³ | Mineral oil, diesel |
Color Advantage: CP-908 white powder is the correct choice when final product color is white or near-white. Standard light-yellow organoclay grades (CP-34, CP-180B) contribute a slight yellow tint visible in white industrial finishes, white cosmetics, and light-color paints. CP-908's colorless gel eliminates this tint without compromising rheological performance in low to medium polarity solvent systems.
Incorporation Method
- Prepare pre-gel: charge solvent, add CP-908 at 6–10% by weight of pre-gel under agitation
- Disperse at high shear for 5 minutes
- Add polar activator: 95% ethanol at 30–40% of CP-908 weight
- Continue dispersion for 5 minutes; rest 10–15 minutes
- Incorporate pre-gel into full formulation
Frequently Asked Questions
What is CP-908 organoclay used for?
CP-908 is used in low to medium polarity coatings, lubricating greases, printing inks, sealants, cosmetics, and oil-based drilling muds. As a white powder producing colorless gel, it is preferred where the yellow tint of standard organoclay grades would be unacceptable — white industrial coatings, near-white cosmetics, light-tinted paints. Requires 30–40% polar activator (ethanol/methanol) at 0.2–2.0% treat rate.
Why is CP-908 specified as a white powder?
CP-908 is produced from a selected bentonite ore yielding white powder after organophilic modification. This eliminates the yellow tint from standard organoclay in white and light-tinted formulations. For solvent-based cosmetics, white industrial coatings, tooth polish, and near-white adhesives where pure white appearance is required, CP-908 is specified over yellow-tinted grades like CP-34 or CP-180B.
Packaging and Storage
| Parameter | Specification |
|---|
| Standard packaging | 25 kg kraft paper bags with PE inner liner |
| Shelf life | 2 years from manufacture date |
| Storage conditions | Cool, dry, well-ventilated warehouse; avoid moisture |
Related grades: CP-10 (white, self-activating) ·
CP-300A (white, also for refractory) ·
CP-34 (light yellow, highest gel strength)
Related applications: Paint & Coatings ·
Lubricating Grease ·
Cosmetics
