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Test Report of Yellowing Ceramic
The impact of yellowing ceramic  
Further to previous “Why Are There Yellowing Areas on DBC/DCB Substrate?”, we’d like to do more testing to see what the different between yellowing substrate and normal without yellowing. In addition to appearance, the biggest impact of performance is the product pressure resistance.

Pressure Resistance Test Results
Type	Q’ty	Press 60 sec	Max pressure value(KV)
Yellowing	10	OK	2.5	2.51	2.52	2.48	2.51
			2.49	2.50	2.49	2.48	2.52
Normal	10	OK	2.51	2.48	2.52	2.48	2.52
			2.50	2.51	2.48	2.52	2.51

The effect of ceramic surface color on Electric pressure.
 
Conclusion: There is no difference between them.

 Peel Force Comparison

Sample	Max Peel Force (N)	Min peel force (N)	Average Peel Force (N)	Average Peel of Strength (N/mm)
1	59.4000	51.4400	54.7600	10.9500
2	58.5900	49.3400	53.3300	10.6700
Average Value	59.0000	50.3900	54.0400	10.8100

Yellowing Ceramic

Peel force curve

Ceramic without yellowing (normal)

Sample	Max Peel Force (N)	Min peel force (N)	Average Peel Force (N)	Average Peel of Strength (N/mm)
1	56.1000	44.2400	50.5000	10.1000
2	51.7000	41.1800	45.9700	9.1900
Average Value	53.9000	42.7100	48.2300	9.6500

Peel force curve

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