Table 3.

Design matrix and response value for the fire resistance test.

Sample	Coded Factors		Uncoded Factors		Responses		Sample	Coded Factors		Uncoded Factors		Responses
	A	B	A	B	TT200	TAE		A	B	A	B	TT200	TAE
S1	−0.500	0.500	20	80	168	439	S21	0.000	0.000	30	70	202	332
S2	0.000	−1.000	30	50	246	274	S22	0.000	0.000	30	70	201	331
S3	−0.500	−0.500	20	60	192	421	S23	0.000	0.000	30	70	198	330
S4	0.000	1.000	30	90	197	425	S24	−1.000	0.000	10	70	164	481
S5	0.500	0.500	40	80	198	285	S25	−0.500	0.500	20	80	172	445
S6	0.500	0.500	40	80	201	287	S26	1.000	0.000	50	70	315	236
S7	0.000	0.000	30	70	198	330	S27	1.000	0.000	50	70	314	237
S8	0.000	0.000	30	70	198	333	S28	0.500	−0.500	40	60	251	261
S9	0.000	0.000	30	70	201	331	S29	−1.000	0.000	10	70	162	487
S10	0.000	0.000	30	70	209	337	S30	0.000	0.000	30	70	199	331
S11	0.000	0.000	30	70	199	331	S31	0.000	0.000	30	70	202	336
S12	0.000	0.000	30	70	201	334	S32	0.000	0.000	30	70	200	330
S13	0.500	−0.500	40	60	246	258	S33	0.500	−0.500	40	60	248	259
S14	0.000	0.000	30	70	199	330	S34	−0.500	0.500	20	80	173	441
S15	0.000	0.000	30	70	201	333	S35	0.000	0.000	30	70	202	332
S16	−0.500	−0.500	20	60	190	419	S36	0.000	1.000	30	90	195	425
S17	0.000	1.000	30	90	195	423	S37	0.000	−1.000	30	50	243	269
S18	1.000	0.000	50	70	312	239	S38	0.500	0.500	40	80	203	287
S19	0.000	−1.000	30	50	240	266	S39	−0.500	0.500	20	80	163	483
S20	−0.500	−0.500	20	60	186	418

TAE = Temperature at equilibrium (in °C); TT200 = Time taken to reach 200 °C (in seconds).