Technical data of type DM-308 electronic glass
1 Subject content and applicable scope
This standard specifies the chemical composition and physical and chemical property indexes of type DM-308 electronic glass.
This standard is applicable to the glass materials used for encapsulation of high-power and semiconductor devices.
2 References
GB 9000 Standard methods for chemical analysis of electronic glass
GB 9622 Test methods for physical and chemical properties of electronic glass
3 Technical requirements
3.1 The chemical composition is given in Table 1.
Table 1
Chemical composition Weight percentage (%)
% Test method
SiO2 66.5±1.0 GB 9000.2
Al2O3 3.0±0.5 GB 9000.7
B2O3
GB 9000.3
K2O 3.8±0.3 GB 9000.10
Na2O 3.7±0.3
Fe2O2 ≤0.151) GB 9000.14
Note: 1) Fe2O3 is controlled as an impurity, so it is not counted in the percentage composition.
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3.2 The physical and chemical property indexes are given in Table 2.
Table 2
S.N. Index name Unit Index Test method
1 Coefficient of mean linear thermal expansion, α, in the range of 0~300℃ 1/℃ (48.0±1.0)×10-7 GB 9622.2
2 Density g/cm3 2.230±0.015 GB 9622.1
3 Softening point ℃ 705±10 GB 9622.4
4 Annealing point ℃ 500±10 GB 9622.5
5 Strain point ℃ 450±10
6 Dielectric dissipation factor tgδ×104 at a frequency of 6MHz and a temperature of 20℃ — ≤30 GB 9622.9
7 Temperature (TK-100) at a volume resistivity of 100MΩ·cm ℃ ≥305 GB 9622.8
8 Thermal stability ℃ ≥200 GB 9622.3
9 Chemical stability level against water — V GB 9622.11
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Additional explanation:
This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry of the People's Republic of China.
This standard was drafted by No.772 Factory, No.774 Factory and the Standardization Research Institute of the Ministry of Electronics Industry of the People's Republic of China.
Chief drafters of this standard: WANG Yongmei, LIU Chengjun and WEI Guangyun.
This standard was issued in 1973 as the first edition, and revised for the second time in August 1994.
