Table 2.
Sound absorption coefficient values of sandwich particleboard.

Frequency (Hz)	Board type
	A	B	C	D	E	F	G	H
		Absorption coefficient
250	0.7	0.6	0.7	0.9	0.8	0.8	0.7	0.8
750	0.5	0.6	0.6	0.5	0.5	0.5	0.6	0.5
1250	0.5	0.4	0.4	0.5	0.4	0.3	0.4	0.3
1750	0.4	0.5	0.4	0.5	0.5	0.5	0.4	0.5
2250	0.4	0.7	0.6	0.6	0.6	0.6	0.7	0.6
2750	0.6	0.5	0.4	0.5	0.6	0.3	0.4	0.4
3250	0.7	0.4	0.6	0.9	0.8	0.6	0.5	0.8
3750	0.8	0.2	0.3	0.9	0.9	0.4	0.3	0.8
4250	0.7	0.3	0.4	0.8	0.9	0.4	0.5	0.7
4750	0.6	0.3	0.4	0.6	0.9	0.7	0.6	0.5
5250	0.5	0.3	0.6	0.7	0.9	0.7	0.6	0.7
Average values	0.6	0.4	0.5	0.7	0.7	0.5	0.5	0.6