Response Surface Method for Strength Analysis and Proportion Optimization of New Type Sealing Materials

Table 4

Response surface secondary model and ANOVA results.

Curing age (d)	Source	Sum of squares	df	Mean square		value	Significance
3	Model	332.63	14	23.76	24.40	<0.0001
	A	159.82	1	159.82	164.12	<0.0001
	B	2.63	1	2.63	2.70	0.1224
	C	4.27	1	4.27	4.39	0.0549
	D	43.67	1	43.67	44.85	<0.0001
	AB	4.10	1	4.10	4.21	0.0593
	AC	4.81	1	4.81	4.94	0.0432
	AD	10.67	1	10.67	10.96	0.0052
	BC	0.058	1	0.058	0.060	0.8102
	BD	1.06	1	1.06	1.09	0.3145
	CD	1.16	1	1.16	1.19	0.2940
	A^2	4.61	1	4.61	4.73	0.0473
	B^2	53.14	1	53.14	54.57	<0.0001
	C^2	7.07	1	7.07	7.26	0.0174
	D^2	16.88	1	16.88	17.33	0.0010
	Residual	13.63	14	0.97
	Lack of fit	13.63	10	1.36
	Pure error	0.000	4	0.000
	Cor total	346.26	28
	Adj	value [-∞, 0.0001]; value [0.0001, 0.05]; value [0.05, +∞]
7	Model	328.94	14	23.50	14.33	<0.0001
	A	139.62	1	139.62	85.15	<0.0001
	B	5.81	1	5.81	3.55	0.0807
	C	7.43	1	7.43	4.53	0.0515
	D	70.35	1	70.35	42.91	<0.0001
	AB	1.34	1	1.34	0.81	0.3819
	AC	1.55	1	1.55	0.94	0.3482
	AD	9.45	1	9.45	5.76	0.0308
	BC		1			0.9413
	BD	0.23	1	0.23	0.14	0.7128
	CD	0.26	1	0.26	0.16	0.6981
	A^2	13.54	1	13.54	8.26	0.0123
	B^2	25.25	1	25.25	15.40	0.0015
	C^2	22.23	1	22.23	13.56	0.0025
	D^2	22.18	1	22.18	13.53	0.0025
	Residual	22.96	14	1.64
	Lack of fit	22.96	10	2.30
	Pure error	0.000	4	0.000
	Cor Total	351.90	28
	Adj	value [-∞, 0.0001]; value [0.0001, 0.05]; value [0.05, +∞]