Hi Ian, Try Measurements Group, a division of Vishay. They are near Raleigh, N.C. Their phone number is (919)365-3800. They make Strain Gages as well as Photoelastic resins that do exactly what you want to do. We have used their Strain gages to make the x/y as well as Z expansion measurements on our laminate materials for several years now. I have also been exposed to their Photoelastic materials which cause fringing to occur on expansion/contraction. I hope thgis helps, Les > From: Ian Boyton <[log in to unmask]>, on 3/3/99 11:28 AM: > Hi All > > I want to carry out some stress measurements on pcb's to analyse the > weakest areas at various assembly and test processes. I can use the > latest technology in software to model the situations, but I'd much > rather use a quicker method. What I had in mind was some kind of spray > adhesive/lacquer which has brittle properties, thus under stress will > crack and be visible under scopes or UV light. Can anyone help out with > the name of supplier of this type of material and has anyone conducted > similar tests. > > Thanks in advance > > Ian > > > ______________________________________________________ > Get Your Private, Free Email at http://www.hotmail.com > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with following > text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section > for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > >