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D3060-94 – Standard Test Method Technical Guide
📊 Significance and Key Measured Properties
This test method, designated D3060-94 (Reapproved 2013), provides a rapid and reproducible procedure for determining the pressure drop rate of compressed gas-propelled products. It is applicable to all products packaged in prepressurized containers. The method simulates actual usage dispensing conditions, allowing for the measurement of equilibrium pressure changes correlated to the amount of product dispensed. By overcoming slight variances in valves and actuators, this test ensures consistent and accurate results.
Pressure drop rate is critical for evaluating product performance and consistency. The final equilibrium pressure in the container is directly related to the mass of product dispensed, making this method valuable for quality control and formulation assessment. The test is designed to be reliable and easy to perform in standard laboratory settings. The significance of this method lies in its ability to provide reproducible data for product development and compliance.
⚙️ Test Procedure and Setup
The test requires specific apparatus and conditioning. A gage must be prepressurized to 5 psi (34 kPa) above the expected container pressure to ensure a gastight seal and prevent contamination. Samples should represent the true product formula, obtained from production or laboratory batches. Conditioning is vital for consistent results. Products normally refrigerated must be kept at 40°F (4.4°C) for at least 24 hours before testing. Products stored at room temperature should be maintained at 70°F (21°C) for a minimum of 24 hours.
| ⚙️ Step | 📏 Parameter | 🎯 Specification |
|---|---|---|
| Gage Prepressurization | Pressure above expected | 5 psi (34 kPa) |
| Conditioning (Refrigerated) | Temperature | 40°F (4.4°C) |
| Conditioning (Room Temp) | Temperature | 70°F (21°C) |
| Conditioning Duration | Time | At least 24 hours |
| Dispensing Interval | Time between dispensings | 5 minutes |
| Maximum Delivery Hold | Hold time without dispensing | 2 minutes |
The procedure begins with mass determination of three filled containers. Using the prepressurized gage, equilibrium pressure is checked. For products requiring shaking, a specific inversion motion is performed ten times, pausing between cycles. Dispensing proceeds at 5-minute intervals, recording the mass dispensed after each step. The test stops when the first gas discharge is observed. The final equilibrium pressure is then recorded. For maximum delivery assessment, the container is held in the dispensing position for 2 minutes without dispensing, using the appropriate orientation for the valve type. The rate of dispensing is regulated to expel the product in a given number of dispensings as per standard recommendations.
⚠️ Important Note: Ensure the gage is prepressurized to 5 psi (34 kPa) above the expected container pressure to avoid contamination and ensure accurate pressure readings. This step minimizes the risk of aerosol product entering the gage, which could affect accuracy. The prepressurization also confirms the assembly is gastight.
❓ Frequently Asked Questions
🔍 What does this test method determine? It determines the pressure drop rate of compressed gas-propelled products, which is essential for evaluating dispensing performance. The test measures how pressure changes as product is dispensed, providing a correlation to the amount delivered.
💡 How should the gage be prepared? The gage must be prepressurized to a pressure 5 psi (34 kPa) higher than the expected container pressure to ensure a gastight assembly and accurate readings. This also prevents gage contamination from the product.
⚡ Why is conditioning important? Conditioning at specified temperatures (40°F for refrigerated or 70°F for room temperature) for 24 hours ensures product stability and consistency during testing, eliminating thermal variables that could affect pressure readings.
📌 What is the key procedure step for accuracy? Dispensing at 5-minute intervals and recording masses carefully ensures accurate correlation of pressure drop to product dispensed. This step minimizes errors from dynamic dispensing effects and ensures equilibrium measurements.