CP-300A is a white-powder organophilic clay providing colorless, high-clarity thixotropic gel in low to medium polarity organic solvent systems. Its white color and colorless gel performance make it suitable for light-tinted industrial coatings, near-white cosmetics, and white refractory castables. CP-300A is particularly notable as one of the few organoclay grades with documented refractory applications — where it functions as a plasticizer and binder additive in high-temperature castable and monolithic refractory formulations, burning out cleanly above 500°C during firing.
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 | Function |
|---|
| Paints & coatings (low to medium polarity) | 0.3–1.2 wt% | Anti-settling, anti-sagging, thixotropy |
| Lubricating grease | 8–15 wt% | Thickener, high-temp consistency |
| Printing ink | 0.5–2.0 wt% | Anti-settling, body and tack |
| Sealants and adhesives | 0.5–2.0 wt% | Non-sag, extrusion profile |
| Cosmetics (anhydrous) | 1.0–5.0 wt% | White powder — no yellow tint in white cosmetics |
| Refractory castables & monolithics | 0.2–1.0 wt% | Plasticizer, workability, aggregate suspension |
Refractory Application — Burnout Characteristic: CP-300A is suitable for refractory castables because it burns out completely above 500°C during kiln firing — leaving no carbon residue that could contaminate the refractory structure or reduce hot strength. LOI of 29–32% (measured at 1000°C) confirms full organic burnout. For high-alumina, mullite, and silica-based refractories requiring maximum purity after firing, CP-300A's complete organic elimination is essential.
Incorporation Method
- Prepare pre-gel: charge solvent, add CP-300A at 6–10% by weight under agitation
- Disperse at high shear for 5 minutes
- Add polar activator: 95% ethanol at 30–40% of CP-300A weight
- Continue dispersion for 5 minutes; rest 10–15 minutes
- For refractory applications: add directly to the liquid phase of the castable mix at 0.2–1.0% and mix thoroughly
Frequently Asked Questions
What are refractory applications for CP-300A organoclay?
In refractory castables and monolithics, CP-300A acts as a plasticizer improving workability and castability, prevents aggregate settling during casting, and provides green strength before firing. It burns out completely above 500°C (LOI 29–32% at 1000°C confirms clean organic elimination) — leaving no carbon contamination in the fired refractory structure. Suitable for high-purity high-alumina, mullite, and silica refractory formulations at 0.2–1.0% addition.
How does CP-300A differ from CP-908 and CP-180?
CP-300A, CP-908, and CP-180 are all white-powder grades with similar LOI (29–32%) for low to medium polarity systems. CP-300A is specifically listed for refractory applications; CP-908 includes oil drilling mud; CP-180 is focused on diesel systems. All produce colorless gel and require 30–40% polar activator at 0.2–2.0% treat rate. Specify CP-300A for refractory use; any of the three for general multi-application coating/grease/ink use.
Packaging and Storage
| Parameter | Specification |
|---|
| Standard packaging | 25 kg kraft paper bags with PE inner liner; 22.68 kg bags available |
| Shelf life | 2 years from manufacture date |
| Storage conditions | Cool, dry, well-ventilated warehouse; avoid moisture |
Related grades: CP-908 (white, includes drilling mud) ·
CP-10 (white, self-activating) ·
CP-34 (light yellow, highest gel strength)
Related applications: Paint & Coatings ·
Lubricating Grease ·
Construction & Industrial
