OP-40, as a high-performance nonionic surfactant, generally has good stability. However, if abnormalities occur, it is recommended to investigate from the following aspects: First, physical form changes. Since the melting point of OP-40 is 40~50°C, it is a paste at room temperature. If it becomes hard and difficult to use in low-temperature environments, this is a normal physical phenomenon. It is recommended to place the packaging barrel in a 25~30°C water bath for slow rewarming (avoid local overheating). Once the fluidity is restored, it can be used normally without affecting product performance.
Second, instability of emulsion or formulation system, such as stratification, demulsification, precipitation, or turbidity. Please check whether the dosage is within the recommended range, whether the system pH exceeds the tolerance limit (OP-40 has good chemical stability in acid, alkali, and salt solutions, but extreme conditions still need verification), whether high water hardness introduces interfering ions, and whether the feeding sequence and stirring shear intensity are appropriate. OP-40 has an HLB value as high as 17~18, with strong hydrophilicity, suitable for O/W emulsion systems. If used in W/O systems, compounding adjustments are required.
Third, poor cleaning or leveling effect, which may be related to the working solution concentration, temperature, or compatibility with additives. The cloud point of OP-40 exceeds 100°C (1% aqueous solution), making it less prone to precipitation under high-temperature conditions. However, when compounded with anionic additives, attention should be paid to charge compatibility to avoid neutral salt precipitation. It is recommended to record the operating temperature, dosage, and types of compounding agents for technician judgment.
If the problem remains unresolved after the above troubleshooting, or if there are doubts about product quality, Haian Guoli Chemical Co., Ltd. provides professional technical support services. Please contact the business manager assigned to you or call the official service hotline of Guoli Chemical (please visit the company's official website for the latest contact information). Before contacting, it is recommended that you prepare the following information to help engineers quickly locate the problem:
Based on the detailed information you provide, Guoli Chemical technicians will compare and analyze the physical and chemical indicators from the product database (such as active content ≥99%, moisture ≤0.5%, acid value ≤0.5, hydroxyl value 27.0~31.0, etc.). If necessary, they can coordinate sample re-inspection or provide targeted formulation adjustment suggestions.
If you need to verify product indicators yourself, please refer to the following key technical parameters of OP-40 provided by Guoli Chemical:
| Indicator Item | Typical Value / Specification |
|---|---|
| Appearance (25℃) | White to light yellow paste |
| Active Content | ≥99% |
| HLB Value | 17~18 |
| pH Value (1% aqueous solution) | 5.0~7.0 |
| Cloud Point (1% aqueous solution) | >100°C |
| Hydroxyl Value (mgKOH/g) | 27.0~31.0 |
| Moisture | ≤0.5% |
| Acid Value (mgKOH/g) | ≤0.5 |
| Melting Point Range | 40~50℃ |
If personal injury occurs during use (skin irritation, eye contact, etc.), stop work immediately and perform first aid according to the SDS:
At all times, do not discharge untreated OP-40 or its solutions directly into water bodies or soil. In the event of a major spill or accident, immediately notify the local environmental protection department and simultaneously contact Guoli Chemical for emergency response guidance.