According to Guoli Chemical's technical data, the core advantage of OP-40 Octylphenol Polyoxyethylene Ether lies in its extremely high ethylene oxide (EO) addition number, which brings excellent high-temperature stability, strong hydrophilicity, and chemical inertness in concentrated alkaline environments. This makes its performance far superior to low-addition-number OP series products in industrial applications requiring extreme conditions.
Below is a detailed comparison based on product data for your reference:
### 1. Detailed Explanation of Core Advantages
Compared with low-addition-number products such as OP-10 (typically EO number 10), OP-40 (EO number 40) has a longer molecular chain, which directly determines its performance differentiation:
- **Extremely High Cloud Point (High-Temperature Resistance)**: The 1% aqueous solution cloud point of OP-40 is **greater than 100°C**. This means it will not precipitate and become ineffective due to the "cloud point" phenomenon in high-temperature or even boiling water environments. In contrast, low-EO-number OP series products generally have lower cloud points (e.g., OP-10 cloud point is about 60-70°C) and are prone to stratification and loss of activity in high-temperature processes. This makes OP-40 particularly suitable as a key raw material for **high-temperature leveling agents**.
- **Excellent Hydrophilicity and Emulsifying Power**: Its HLB value is as high as **17-18**, making it a typical O/W (oil-in-water) emulsifier. It is significantly higher than the HLB value of OP-10 (approximately 13-14), with strong hydrophilicity, enabling more efficient emulsification, dispersion, and solubilization in aqueous systems.
- **Outstanding Stability in Concentrated Alkali**: Guoli Chemical's data particularly emphasizes OP-40's "**resistance to alkali, stable in concentrated alkali**" characteristic. This advantage allows it to maintain structural stability and continuously perform cleaning functions in industrial hard surface cleaning and metal processing cleaning agents requiring high alkalinity. Low-addition-number products may suffer from reduced solubility or salting out in concentrated alkali.
- **Low Foaming Property**: With a high EO addition number, OP-40 has significantly reduced foaming power and is classified as a **low-foam** surfactant. This is a key performance advantage in scenarios such as industrial circulating water treatment and high-temperature high-pressure spray cleaning, reducing the need for defoamers.
- **Higher Safety and Operational Convenience**: OP-40 appears as a **paste** at 25°C, with a flash point **above 200°C**, making it non-flammable and very low in volatility. Compared with some low-addition-number liquid products (which have relatively lower flash points), it offers higher safety during high-temperature use.
### 2. Key Performance Parameter Comparison
| Performance Indicator | OP-40 (Guoli Chemical) | Common Industry OP-10 | Comparative Advantage Interpretation |
| :--- | :--- | :--- | :--- |
| **HLB Value** | **17-18** | ~13-14 | OP-40 has extremely strong hydrophilicity, making it a more efficient emulsifier and solubilizer in aqueous systems. |
| **Cloud Point (1% aq.)** | **>100°C** | ~60-75°C | **Core advantage**. OP-40 can be used stably in boiling water and high-temperature processes without stratification. |
| **Concentrated Alkali Stability** | **Stable** | Moderate/Unstable | **Key advantage**. It can remain active in high-concentration alkaline cleaning agents. |
| **Foam Characteristics** | **Low foam** | Medium to high foam | Reduces foam problems in industrial cleaning applications such as circulating water and spraying. |
| **Form (25°C)** | **Paste** | Liquid | The paste form facilitates compounding with other solid raw materials, with no dripping during operation. |
| **Surface Tension** | **30~35 mN/m** | ~30-35 mN/m | Both have excellent wetting and penetrating capabilities, with comparable performance. |
| **Active Content** | **≥99%** | ≥99% | Very high content ensures sufficient active ingredients. |
| **Hydroxyl Value** | **27.0~31.0** | ~85-90 | The lower the hydroxyl value, the higher the EO addition number and the stronger the hydrophilicity, fully consistent with the HLB value data. |
### 3. Application Selection Recommendations
Based on Guoli Chemical's technical data, we recommend selecting according to the following application scenarios:
- **Scenarios for Choosing OP-40**:
- **High-temperature leveling agent**: In high-temperature high-pressure dyeing of polyester and other synthetic fibers, the auxiliary must continuously work during heating and holding stages.
- **Strong alkaline cleaning agent**: For heavy-duty cleaning of beer bottles, aluminum processing parts, and metal components.
- **High-temperature emulsion polymerization**: Emulsifiers must maintain emulsion stability during polymerization exothermic processes and external heating.
- **Pesticide emulsion in water (EW) or suspension emulsion (SE)**: Providing efficient emulsification for highly hydrophilic pesticide active ingredients.
- **Applications requiring low foam**: Such as high-temperature high-pressure spray cleaning systems.
- **Alternative Reference**:
If you need a product that is liquid at room temperature, you can try melting OP-40 before use or consult Guoli Chemical's technical team, who may provide a solution with a specific form or formulation from the same series.
In summary, OP-40 sacrifices certain low-temperature fluidity in exchange for **unparalleled high-temperature and strong alkali tolerance and excellent hydrophilic emulsification ability**. It is a high-performance, specialized product from Guoli Chemical for specific industrial applications.
