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hi all, I am looking for the testing method for flexural strength of ceramic and I come across several different type. Does anyone know the difference between ASTM-F417, ASTM-F394 and ASTM-C1161? Another question is, whether the speed of the loading will influence the flexural strength of the...

Hi, Does anyone know of an effective method to clean the flux residue of a SAC305 solder joint? I need to totally remove the residue in order to ensure no delamination effect of the silicone rubber layer and the solder joint. Thank you! Best regards, ct

Hi, I'm looking for ways on how to detect delamination effect of a clear silicone rubber layer adhered to a white color surface. Can anyone shed some light here? Thanks! Best regards, ct

Hi, I'm looking for a type of solder paste which is tested and found pass under 120 deg C operating condition for long hours. Can any one shed some light here? Best regards, ct

Hi, Can anyone shed some light here about what's the difference between these two? Thanks in advance. Best regards, ct

Hi, Anyone has an idea to draw MacAdam ellipse in excel? Best regards, ct

Hi all, I'm not sure if this is the right place to ask this question, but here is how it goes: I have two SMT sub-con houses who are equal in terms of their equipment. My product is a two layer PCBs which the top and bottom copper are OSP treated. The issue I'm facing is that one of the sub-con...

Is there a way/test to find out if a screw has a risk of hydrogen embrittlement attack? Best regards, ct

Hi, Has anyone got any data to show whether temperature cycle or constant high temperature would cause bigger impact to warpage on FR4 PCB. Best regards, ct

Hi, Can anyone tell me how would the thermal conductivity be impacted on an oxidized copper surface. Best regards, ct

Hi, Can anyone shed some light regarding Pin in Paste technology? Question: what's the acceptance level in% for the so called "barrel filled" (meaning the the volume of solder filling up the PTH) Best regards, ct

Hi, I have difficulty to join certain entieis where I always see the message "two entieis are non-coplanar, is there a way to make those entities co-planar? Best regards, ct

Hi, can anyone shed some light on this...what should be the minimum spacing between the +ve and -ve traces on a FR4 PCB, in order to pass in a 4kV high pot test. Thanks! Best regards, ct

Hi, Can someone confirm what's the acceptance specs of solder void (SMT reflow oven) for consumer electronics. Many thanks. Best regards, ct

Can the font size of time and date stamp be changed in 2007LT? Best regards, ct

Can the dwg file be protected just like the Microsoft xls or doc file? Meaning any attemp to overwrite the file is not possible unless one use "save as" and under different file name. Thanks! Best regards, ct

Hi, Do anyone know how to do this? Thank you in advance. Best regards, ct

I wanna create a drawing title block which will contain 2x the drawing number on it, one at the lower right corner and the other at the upper right corner. Can I link these two to only one attribute tag? so when I edit it, both the linked drawing number will be updated. Best regards, ct

hi folks, I read an article about heat sink, it says that; 1) heat sink with painted surface will have better thermal emissivity than an unpainted one 2) and one with brighter color (eg. white) will have about 3% higher in thermal emissivity than a black coloured one. 3) anodizing will decrease...

Hi, can anyone recommend a supplier who's good in manufacturing multilayer metal core PCB. Appreciate it. Best regards, ct