Guohao truck filter High-quality air filter with excellent moisture resistance
1. Sample Preparation
- Sampling: Randomly cut circular (125 mm diameter) or square (125 mm × 125 mm) specimens from the paper or paperboard according to GB/T 450, ensuring an effective test area of 100 cm².
- Pretreatment: Condition the specimens in an environment with a temperature of 23 ± 1°C and relative humidity of 50 ± 2% for at least 24 hours.
2. Equipment and Reagents
- Main Instruments:
- o Cobb absorption tester (including metal cylinder and clamping device)
- o Electronic balance (accuracy: 0.001 g)
- o Stopwatch
- o Measuring cylinder (100 mL)
- Liquid: Distilled or deionized water, maintained at 23 ± 1°C.
Test Steps
- Place the pretreated specimen with the test surface facing downward in the bottom of the tester’s cylinder, ensuring a smooth fit without air bubbles.
- Pour 100 mL of water into the cylinder and immediately start the timer (common test durations: 30 s, 60 s, 120 s).
- After the specified time, invert the cylinder to drain excess water. Within 10 seconds, cover the specimen with absorbent paper and roll to remove surface moisture.
- Quickly weigh the specimen after absorption (m₂) and compare it with its initial dry weight (m₁).
- Calculation
- Cobb Value Formula:
- C=(m2−m1)×10or equivalent formC=(m2−m1)×10or equivalent form
- Where:
- C = Cobb value (unit: g/m²)
- A = Test area (unit: m²)
- If the test area is 100 cm² (0.01 m²), the formula simplifies to the latter expression.
- Key Considerations
- Test Surface Selection: Distinguish between the front and back sides of the paper, testing each separately.
- Time Control: Adjust absorption time based on paper type (e.g., 60 s for packaging paper, 30 s for moisture-resistant paper).
- Environmental Consistency: Maintain standard temperature and humidity throughout testing to avoid external interference.
Testing date
| 标题 1 | 标题 2 | 标题 3 | 标题 4 | 标题 5 | 标题 6 |
|---|---|---|---|---|---|
| No. | Name | Item | Method | Result | Remark |
| 1 | Guohao truck filter | Moisture resistance testing | GB/T 1540-2002 | 16.5 | Cobb 30s |
Official lab test data shows that the Guohao truck filter products has excellent resistance to humidity. It won't be damaged by storage time or humid environments, which could affect the quality of the air filter.