07:48 PSD, 7/10/95

ONE OF OUR OPERATORS LEFT A LOAD OF PCBs IN OUR SOLDER MASK CURING 
OVEN FOR 40 HOURS AT 300F OVER THE WEEKEND.  THEY ARE PCBs TO AN OLDER 
INSTRUMENT FABRICATED WITH DIFUNCTIONAL FR4, .062 1/1.  THEY ARE 
SOLDER MASKED WITH PC401.  THEY ARE SLIGHTLY DISCOLORED.

1)  WILL THE PROPERTIES (ESPECIALLY ELECTRICAL, e.g. DIELECTRIC 
CONSTANT, INSULATION RESISTANCE, DISSIPATION FACTOR, DIELECTRIC 
BREAKDOWN VOLTAGE, ETC.) BE DEGRADED?

2)  WILL A 40 HOUR BAKE AT 300F DEGRADE THE FIRE RETARDING PROPERTIES?

RESPONSE TO THIS IS URGENT.  THANKS IN ADVANCE FOR ANY INFORMATION.

Fred Paul
FLUKE CORPORATION
POB 9090   M/S 55
EVERETT, WA 98206
VOICE MAIL:  (206)356-5734
FAX:	     (206)356-6070