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This troubleshooting chart has been developed to assist 3M customers in identifying and solving some possible problems that can occur when using 3M™ Scotchcast™ Liquid Resins. Should you need further assistance, contact your local 3M Sales Representative or area electrical distributor. nc Problem U Cause and Solution ex ure te d ns R i e Th ve c sin ur re er in m bu m g ai t b op ns ec las liq C ui ha om tic d, es C in rr so ce ing liq ast ft u i n o i n or O ter r D d or g ap ta oz ck isc ta pe i y an ng ck a ol ev or y rs d en in at no s o Re g e af on sin le rm C R te a v ra e oo at l a r si ed t do ck ze n ro ap s w ing t em om n fro p ea o F pe te m Po r su iss rs r fis or bu atu mp bs ure s ur le A r e s ne res era qu d e ad d tu d, an en ev re w hes e d es C ires ion t th lop ar p ra e e ou i a c r n R m c zi ia nd ng nd s es al a lly i s te Su o o n re sho ting rm n le ck e rfa i D n as al ith ist ce s, es er or ex lu tio f d r gs hi o u n m r bi in t c s C g o St as fin cu m ic tin po e re cr re kin ,c g ne ac m g wa oo n ov A ks ts r lp ,t ,r s So e ll o er i o p r ft m rd pl p in es ar c u Sp is al to to re ot or s, rts fm d s ge pr S f o n r od of Bl o l e d m ra em uc t a di lr m ffi ts rea ro is ou ol cu ug he s d gh l tt in s h s ha ne o o S f u Vo r p ur p ss l l e yi itt fac ed e in ds B th u e b ca bl s t es in g 3M™ Scotchcast™ Liquid Resins Troubleshooting Contamination Moisture/Keep covered Dirt/Clean parts and keep them covered Excess mold release/Use sparingly Oxidized surfaces/Remove oxide Incompatible insulation or components/ Change insulation Rough mold surface/Polish mold Undercuts in mold/Remove undercuts Insufficient mold release/Use more mold release Inadequate mold release/Use different mold release Permanent-type release worn away/ Resurface mold Mold not broken in/Use mold Insufficient vacuum/Adjust vacuum Resin viscosity too high/Select resin with lower viscosity or warm resin to reduce viscosity Component design/Check design for undercuts Difficult-to-bond-to surface (e.g., plastics)/ Evaluate Scotchcast primers; “rough up” surface Nonstick surface (PTFE, etc.)/ Change materials Incorrect mix ratio/Check equipment and procedures, must be within + 2% Insufficient mixing/Having proportioned parts A and B correctly, mix thoroughly Resin not fully cured/Check oven temperature. Is resin at cure temperature at onset of timed cure cycle? Wrong resin choice/May need more flexible system or a filled system Poor component or mold design/ Change design Cure temperature too high/ Lower temperature Temperature reached as a result of exotherm/Check exotherm. Use smaller mass of resin Excessive shrinkage/Filled resins exhibit less shrinkage and should be considered if this problem persists Indicates cause and effect
