| 摘要 |
Provided is a phenolic resin foamed plate having a thickness of 50 mm or more, wherein, when the phenolic resin foamed plate is sliced, from one principal plane thereof, into (n) pieces at 5 mm intervals in the thicknesswise direction along the principal plane, the obtained (n) pieces are named, starting from the principal plane side, (Q1) to (Qn), and the average densities of (Q1) to (Qn) are referred to respectively as (dq1) to (dqn), the ratio (dqmin/ dqave) of the minimum value (dqmin) among (dq2) to (dq(n-1)) to the average (dqave) of (dq2) to (dq(n-1)) satisfies 0.91=(dqmin/dqave)=0.98; and when (Di)values [Di=(dq(i-1)+dqi+dq(i+1))/3, wherein (i) is an integer of 2 to (n-1), provided that when (i) is 2 and (n-1), (D2) equals to (dq2) and (D(n-1)) equals to (dq(n-1)) respectively] are calculated, plotted according to the numerical value of (i) [with (i) on the horizontal axis and (Di) on the vertical axis] and connected together to give a density distribution curve, there is a straight line intersecting with said density distribution curve at 4 points and being parallel to the horizontal axis. Thus, a phenolic resin foamed plate, which shows practically sufficient compression strength and heat conductivity even in the case of increasing the product thickness, can be obtained. |
