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Permali Approves Smart Sonic for Durostone Pallet Cleaning
October 25, 2002 |Estimated reading time: 1 minute
Maxeville, France and Canoga Park, Calif. -- Permali Composites S.A., manufacturer of Durostone pallet materials has approved Smart Sonic ultrasonic stencil cleaners and 440-R SMT detergent for cleaning flux residues from reflow and wave solder pallets.
It was previously advised not to clean Durostone solder pallets using ultrasonic equipment as it seriously degraded the material and left it susceptible to flux attack, reducing the lifespan of the pallets. Two cases had been reported but a manufacturer supplying the PCB industry did not produce the ultrasonic machines used in both instances.
As many end users were having problems with cleaning and did not have a budget to invest in a dedicated system just for pallets, inquiries were received from customers if they could use the ultrasonic stencil/pallet cleaners available for this purpose.
Tests were carried out in conjunction with Smart Sonic Corp. A batch of pallets covered in a no-clean flux were submitted to Smart Sonic for cleaning and returned to the customers' production line. Following cleaning of the pallets, no degradation occurred so it was concluded that given the correct equipment and process settings, ultrasonics does not affect Durostone.
The pallets cleaned at Smart Sonic were at a frequency of 40 kHz or higher, with a power input of 11 W per liter or less (12-15 W would be OK) in a wash cycle of 10 minutes or less.
It was finally concluded that the past problems occurred due to the material being subjected to a low frequency, i.e. below 40kHz. The lower the frequency the more aggressive the ultrasonic cavitation.
For more information on Smart Sonic Corp., visit www.smartsonic.com. For more information on Permali Composites S.A., visit www.permali.com.