- CRC ELECTRONICS CLEANER - 4 Updates
- VEHICLE VIDEO - 1 Update
| avagadro7@gmail.com: Jul 24 05:45PM -0700 THE PRODUCT IS http://shop.advanceautoparts.com/wcsstore/CVWEB/staticproductimage//N3225/large/7070074_crc_05103_pri_larg.jpg contains a naptha. I conclude the naptha burns off with flux. However, as with JIFFY LUBE, cleaned surfaces do not develop colors over time expect to darken the surface. The spray is toxic in a closed area. |
| Phil Allison <pallison49@gmail.com>: Jul 24 07:56PM -0700 > THE PRODUCT IS http://shop.advanceautoparts.com/wcsstore/CVWEB/staticproductimage//N3225/large/7070074_crc_05103_pri_larg.jpg ** CRC QD appears to be a new product, going by the date on the MSDS sheet. The can contains naptha and a propellant and not much else - naptha is a strong hydrocarbon solvent, once used as dry cleaning fluid. I would expect the surface to be left very clean after use while both the naptha and propellant evaporate fast. The stuff is however highly flammable, even explosive so no smoking while using it! ... Phil |
| Jeff Liebermann <jeffl@cruzio.com>: Jul 25 07:56AM -0700 >THE PRODUCT IS >http://shop.advanceautoparts.com/wcsstore/CVWEB/staticproductimage//N3225/large/7070074_crc_05103_pri_larg.jpg >contains a naptha. I conclude the naptha burns off with flux. Naphtha does not oxidize (burn) off anything. It dissolves and then evaporates. If you're lucky, it takes the diluted flux with it. If not, it leaves a residue of evenly distributed flux, in a very thin layer. Of course, if you wipe or blot it off, the flux goes with the solvent. <http://www.crcindustries.com/faxdocs/msds/5101.pdf> Looks like a mix of naphtha, difluoroethane, hexane, dimethylbutane, methylpentane. All of these ingredients evaporate. At the bottom of section 9, it proclaims: Percent volatile: 100% estimated which means that the cleaner leaves no residue. However, that does not mean that dissolving an unspecified type and amount of solder flux with the cleaner also does not leave a residue. For example, water soluble fluxes do not easily dissolve in organic solvents and do better with hot water as a flux cleaner. Other types of fluxes (i.e. no-clean flux) are made to be left in place on the PCB. I guess you'll just have to test the cleaner. Take a sheet of clean window glass. Lay it horizontally flat. Spray some of the CRC Electronic Cleaner on the glass. Allow it to evaporate. If not, blot it dry but don't rub. Is there anything left on the glass? Repeat with anything claiming to be both a cleaner and lubricant and you should see an oily residue. Incidentally, I use the stuff for cleaning automotive connectors. Works quite nicely. >However, as with JIFFY LUBE, cleaned surfaces do not develop colors over time expect to darken the surface. By colors, I assume you mean oxidation of the copper PCB traces. Yes, cleaning off any protective coating of flux or goo will expose to copper to atmospheric attack. >The spray is toxic in a closed area. So am I. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Jeff Liebermann <jeffl@cruzio.com>: Jul 25 08:17AM -0700 On Fri, 24 Jul 2015 19:56:45 -0700 (PDT), Phil Allison >** CRC QD appears to be a new product, going by the date on the MSDS sheet. I've been using it for at least 10 years, so it's not a new product. However, there may have been changes in formulation, or MSDS reporting requirements. >The stuff is however highly flammable, even explosive so no smoking while using it! I was using it to clean connectors under the hood of my truck. The engine was still warm. I managed to spray some on the engine, but saw no flames or smoke. The flash point of naphatha is 225C. I've measured 250C exhaust manifold temperature on my former truck, so I guess it's possible to create an explosion. This engine went to 425C and would certainly ignite the fumes: <http://joyreactor.com/post/1548773> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| avagadro7@gmail.com: Jul 24 05:51PM -0700 Need a 3rd TV camera for my truck for rearward views of a towed trailer. Is the video output of vehicle cameras compatible with a Dell Inspiron flat screen ? is there a standard for communications between units ? The Dell sits on a plywood table from dash over doghouse to the metal cargo/cockpit divider wall. Dell runs Garmin and Streets and trips...going around and thru LA is a snap. However, LA sports some wicked arterial intersections where rearward cameras are a large safety component. Are wireless camera/screen units equipped with frequency adjusters so a second and interfering signal can be tuned away from with a frequency adjuster ? other suggestions and info welcome. |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 5 updates in 2 topics"
Post a Comment