Comprehensive and detailed physicochemical parameters of OP-21 Octylphenol Polyoxyethylene Ether, covering three categories: basic chemical properties, physical properties, and safety-related characteristics, providing complete data reference for formulation development and quality control.
Detailed Description
OP-21 Octylphenol Polyoxyethylene Ether (CAS No.: 9036-19-5) is a high-performance nonionic surfactant with the molecular formula C8H17C6H4O(CH2CH2O)21H (n≈21) and molecular weight of approximately 1130. The product appears as a white to light yellow paste or solid, with consistency varying with temperature changes. It has high active matter content (≥99%), is readily soluble in water, is chemically stable at room temperature, and exhibits excellent resistance to acids, alkalis, and hard water.
In terms of surface activity, OP-21 has an HLB value of up to 16, making it a highly hydrophilic emulsifier. Its cloud point is ≥100℃, and the critical micelle concentration (CMC) is 2.5×10-4 mol/L, significantly reducing the surface tension of water to about 32 mN/m. These properties enable it to maintain excellent emulsification, dispersion, and wetting functions even in high-temperature and high-electrolyte systems. Its foam properties are moderate to low foaming, suitable for industrial applications requiring foam control.
From a safety physicochemical perspective, the product has a flash point >200℃ (closed cup), is non-flammable, and poses no explosion or oxidation hazards. However, it should be noted that it is irritating to the skin and eyes, classified under GHS as Skin Irritation Category 2 and Serious Eye Irritation Category 2A, and also has reproductive toxicity (Category 2) and aquatic environmental hazards (Acute and Chronic Category 2). Strict adherence to safety operating procedures is required during use.
Technical Parameters
Basic Chemical Parameters
| Parameter Name | Value/Specification |
|---|
| CAS Number | 9036-19-5 |
| Molecular Formula | C8H17C6H4O(CH2CH2O)21H (n≈21) |
| Molecular Weight | Approximately 1130 |
| Ionic Type | Nonionic |
| Appearance | White to light yellow paste or solid |
| Active Matter Content | ≥99% |
| Solid Content | ≥99% |
| Moisture | ≤0.5% |
| Free Alcohol | ≤1% |
Surface Activity and Functional Parameters
| Parameter Name | Value |
|---|
| HLB Value | 16 |
| Cloud Point | ≥100℃ |
| Critical Micelle Concentration (CMC) | 2.5×10-4 mol/L |
| Surface Tension | Approximately 32 mN/m (Source: Guoli Chemical Database) |
| Penetration Power (1% Aqueous Solution) | >180 s (Source: Guoli Chemical Database) |
| Foam Properties | Moderate to low foaming |
| Alkali Resistance | Good |
Physicochemical Indicator Parameters
| Parameter Name | Value |
|---|
| pH Value (1% Aqueous Solution) | 5.0~7.0 (Product Specification); 6.0–8.0 (Safety Data Sheet, 25℃) |
| pH Value (5% Aqueous Solution) | 5.5~7.0 |
| Hydroxyl Value | 45~55 mgKOH/g |
| Acid Value | ≤0.3 mgKOH/g |
| Saponification Value | ≤1 mgKOH/g |
| Iodine Value | ≤0.5 gI2/100g |
| Amine Value | ≤0.1 mgKOH/g |
| Tertiary Amine Content | ≤0.1% |
| Unsaturation | 0 mol/kg |
| Heavy Metals | ≤10 mg/kg |
| Arsenic | ≤2 mg/kg |
Physical Property Parameters
| Parameter Name | Value |
|---|
| Melting Point | Approximately 45~50℃ |
| Density | Approximately 1.06 g/cm³ |
| Refractive Index | 1.483~1.487 |
| Kinematic Viscosity (50℃) | Approximately 150 mm²/s |
| Low Shear Viscosity (50℃) | Approximately 2000 mPa·s |
| Flash Point (Closed Cup) | >200℃ (Product Specification); >150℃ (Safety Data Sheet) |
| Solubility
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