cylinder of uniform wall section a typical oven cycle would consist of a temperature of about 700 u00b0 f for 75 minutes for this same type of part melt flow of the modified pfa powder adequate for rotomolding purposes can be obtained at temperatures below the maximum discussed above for example adequate melt flow can be obtained at 675 u00b0 f if that temperature is maintained for 90 minutes thus the rotolining operator is given an operating 34 window 34 affording substantial flexibility in selecting practical time temperature conditions to be programmed for any given product to be lined on completing the melt lining program the mcneil akron rotolining apparatus is activated to index the spider arm to a cooling station during transition to this station as well as during its residency thereat the spider arm and clamping fixture continue to cause the part to be rotated while cooling air and or water spray introduced at the station reduce the temperature of the part to ambient room conditions on completing the cooling operation the rotolining machine is again indexed to bring the finished part of the loading unloading station where it is removed and replaced by another part to be lined the lining of the finished part is found on inspection to be free of all bubbles or other porosity the general procedure described in example i is followed but in this case the 34 as received 34 pfa polymer is a blend of 70 30 parts by weight of 34 te9714 34 and 34 te9715 34 these grades differ in their molecular weights the former being the lower weight material the blend produces a.