Test method of epoxy molding compound for electronic packaging
1Key Takeaways
This document specifies the appearance, gelation time, spiral flow length, flash, thermal hardness, density, thermal conductivity, viscosity, glass transition temperature, linear thermal expansion coefficient, water absorption, and flame retardancy of epoxy molding compounds for electronic packaging. Properties, conduc…
2Expert Interpretation
Comprehensive analysis of GB/T40564-2021 standard for test methods of epoxy molding compounds for electronic packaging, covering 28 key testing technologies such as appearance inspection, physical and chemical properties, mechanical properties and electrical properties, providing standardized operating procedures and data interpretation methods, suitable for quality control of semiconductor device packaging materials.
Analysis of the core content of the standard
This standard systematically specifies the performance test system for epoxy molding compounds used in electronic packaging, including 28 test items in 4 categories, forming a complete material evaluation matrix. The design of the test method fully considers the characteristics of the semiconductor packaging process and has the following technical features:
- Establish a three-level quality control system (raw materials → process parameters → finished product performance)
- Introduce the high temperature and high humidity accelerated aging test scenario
- Combining non-destructive testing with destructive testing
Comparison of key technical indicators
| Test items | Test methods | Key parameters | Accuracy requirements |
|---|---|---|---|
| Gelation time | Hot plate method | 175℃±1℃ | ≤5% deviation |
| Spiral flow length | Mold injection molding method | 6.90MPa±0.17MPa | ≤5% deviation |
| Glass transition temperature | DMA/TMA | Heating rate 5℃/min | ±2℃ |
Details of typical test methods
1. Gel time test
The hot plate method is used to determine the transition time from the molten state to the gel state:
- Sample preparation: crushed to powder (212-600μm)
- Test conditions: 175℃±1℃ constant temperature electric heating plate
- End point determination: stop timing when the stirring rod shows obvious resistance
Application case: The test value of a certain model of EMC material is 45s, which is consistent with the industry benchmark value (40-50s), indicating that its curing rate is moderate and suitable for multi-cavity mold injection molding.
2. Uranium content detection
Safety warning:Hydrofluoric acid must be handled in a fume hood, and a gas mask and acid-resistant gloves must be worn
Use ICP-MS to determine trace uranium elements:
- Sample pretreatment: 750℃ incineration to remove organic matter → microwave digestion (3mL HF)
- Instrument parameters: RF power 1100W, monitoring m/z=238
- Detection limit: 0.03mg/kg (0.5g sample)
Standard implementation recommendations
Laboratory construction requirements
- Environmental control: temperature 15-30℃, humidity 20-70%
- Equipment configuration: must include precision instruments such as DMA, ICP-MS
- Staff qualifications: chemical analysts must be certified
Key points of quality control
- Establish a traceability system for standard substances
- Insert control samples for every 20 samples
- Two people shall review key parameters
Technology evolution analysis
Main improvements of this standard compared with the old version:
- New items: 5 tests including uranium content (6.18) and bonding strength (7.4)
- Method upgrade: DMA method (6.8.1) is added to the glass transition temperature test
- Improved accuracy: The allowable deviation of flash detection is tightened from 15% to 10%
Reflects the industry's development trend towards high reliability and environmental protection requirements.