Electronics Forum | Fri Jan 14 17:09:21 EST 2005 | Bob R.
Whether or not conformal coating creates a reliability problem if it bridges the gap between the board and bottom of the part depends on the properties of the coating. A low modulus coating is fine, but one thats modulus increases at colder temperat
Electronics Forum | Fri Jun 02 15:53:51 EDT 2000 | James Burrell
I'm considering using Delmat, or some equivalent material, as a stiffener for rather large pcb, but I don't know the material properties. Specifically I'm interested in: Young's Modulus, E Poisson Ratio, nu Density, rho Strength, Thanks, Jim
Electronics Forum | Thu Mar 27 15:19:07 EDT 2008 | ck_the_flip
Will clay, rock, and paper provide sufficient signal carrying capabilities without degrading signal strength or transmission speed, and further, will these materials exceed tensile strengths of traditional "metallurgical" solder joints? DaveF? Patr
Electronics Forum | Thu Feb 11 09:12:46 EST 2010 | blnorman
Have you checked to make sure the mix ratio is correct? My experience with epoxies is that if the mix ratio is off with too much hardener you will get a much higher exotherm than expected. Modulus is high too, pretty stiff material.
Electronics Forum | Thu Feb 11 09:14:05 EST 2010 | blnorman
One other thing, if you're using this for vibration dampening, would a silicone work? Much lower modulus.
Electronics Forum | Thu Jun 04 02:16:43 EDT 2020 | SMTA-Robert
Looking for CTE and young's modulus values for aluminum backed PCB for solder joint predictions. The data sheets are a bit sparse, and the weighted average method somehow doesn't feel appropriate. Any advice is welcome. Thanks!
Electronics Forum | Wed Jun 24 15:16:51 EDT 2020 | SMTA-Dave
The typical CTE below Tg is 40 ppm/K and 110 above Tg ppm/K. The typical modulus is 16 Gpa
Electronics Forum | Thu Oct 15 15:34:16 EDT 1998 | Andrew
We have a need to bond Flatpack and Quadpack components to the circuit board. The adhesive should be quick curing, repairable and have a low modulus. It does not have to be thermally conductive (but it would be a plus). The components are currently
Electronics Forum | Fri Jul 06 10:08:21 EDT 2007 | blnorman
The coating thickness is more a property of the individual coating itself. The 0.03 - 0.13 is based on average properties of acrylics in general. It's like trying to pour 3 mils of motor oil on a table. The material will find it's own thickness.
Electronics Forum | Thu May 17 15:17:42 EDT 2001 | blnorman
Parylene is arguable the best conformal coating there is, unfortunately it's also the most expensive. We had considered using it some time back, but due to environmental and safety issues, we would have had to build a new building to house the proce
