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Photo Resist Preparation - thanks for the suggestions

Michael Sims All Messages By This Member #35956 Hello, Thanks to all who provided suggestions on how to eliminate or get rid of air bubbles between the photo resist and PCB. ? ?Already from the initial look at some of the suggestions I'm finding additional information of how I can improve my application of using the photo resist technique to make printed circuit boards.? Look forward to reviewing all of the suggested material. Again, thanks for all the good suggestions and sharing your experience. ?? V/R, ?? Mike, K4GMH -- Mike, K4GMH
Sam Reaves All Messages By This Member #36792 A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Jim Pruitt WA7DUY All Messages By This Member #36793 Is kpr a negative resist?? Or positive resist? toggle quoted message Show quoted text On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@...> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Sam Reaves All Messages By This Member #36794 Negative resist. You use it with a negative. A bottle will?last a lifetime. I think it is made by Transene now. Sam Reaves ARS W3OHM Owner and Moderator of: LeCroy Owners Group on 开云体育 Electronics and Mechanical Hardware Design Engineering Manager Andritz Rolls Global Research Center (RETIRED) toggle quoted message Show quoted text On Fri, Mar 12, 2021 at 11:56 PM Jim Pruitt <jpruitt67@...> wrote: Is kpr a negative resist?? Or positive resist? On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@...> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Harvey White All Messages By This Member #36795 开云体育 Short wave sensitive.? Unshielded mercury vapor arcs.? Expose through negatives where the trace is transparent, background is opaque.? Develop in the appropriate developer and then put the dye on.? That'll show you where the resist really is.? Cover holes (if any) with something opaque, then etch.? It'll withstand ferric chloride, although I'd recommend CuCl etchant (hydrochloric acid and hydrogen peroxide to start with) because it's FAR cheaper, better behaved, and works as well. Once etched, strip off resist or solder through depending on whether or not you want tin-lead plating.? I never had access to tin lead plating when I was using KPR. All of my boards then were using crepe paper tape, 2x photo masters, an 8x10 view camera shooting on kodalith, (use kodalith developer!? Dektol gives? you gray scale), and then contact printing. Harvey On 3/14/2021 9:07 PM, Sam Reaves wrote: toggle quoted message Show quoted text Negative resist. You use it with a negative. A bottle will?last a lifetime. I think it is made by Transene now. Sam Reaves ARS W3OHM Owner and Moderator of: LeCroy Owners Group on 开云体育 Electronics and Mechanical Hardware Design Engineering Manager Andritz Rolls Global Research Center (RETIRED) On Fri, Mar 12, 2021 at 11:56 PM Jim Pruitt <jpruitt67@...> wrote: Is kpr a negative resist?? Or positive resist? On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@...> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Jeff All Messages By This Member #36796 开云体育 Where is PKP-308i purchased? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Sam Reaves Sent: Sunday, March 14, 2021 9:08 PM To: [email protected] Subject: Re: [homebrewpcbs] Photo Resist Preparation - thanks for the suggestions ? Negative resist. You use it with a negative. A bottle will?last a lifetime. I think it is made by Transene now. ? Sam Reaves ARS W3OHM Owner and Moderator of: LeCroy Owners Group on 开云体育 Electronics and Mechanical Hardware Design Engineering Manager Andritz Rolls Global Research Center (RETIRED) ? ? ? On Fri, Mar 12, 2021 at 11:56 PM Jim Pruitt <jpruitt67@...> wrote: Is kpr a negative resist?? Or positive resist? ? On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@...> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Jim Pruitt WA7DUY All Messages By This Member #36797 开云体育 What is the nomenclature for the positive resist and where can it be purchased? Thank you. Jim Pruitt On 3/14/2021 6:07 PM, Sam Reaves wrote: toggle quoted message Show quoted text Negative resist. You use it with a negative. A bottle will?last a lifetime. I think it is made by Transene now. Sam Reaves ARS W3OHM Owner and Moderator of: LeCroy Owners Group on 开云体育 Electronics and Mechanical Hardware Design Engineering Manager Andritz Rolls Global Research Center (RETIRED) On Fri, Mar 12, 2021 at 11:56 PM Jim Pruitt <jpruitt67@...> wrote: Is kpr a negative resist?? Or positive resist? On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@...> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM
Donald H Locker All Messages By This Member #36798 How about "positive photoresist" from Donald. -- Plain Text email -- it's an accessibility issue () no proprietary attachments; no html mail /\ <> toggle quoted message Show quoted text On 2021-03-15 4:14 a.m., Jim Pruitt wrote: What is the nomenclature for the positive resist and where can it be purchased? Thank you. Jim Pruitt On 3/14/2021 6:07 PM, Sam Reaves wrote: Negative resist. You use it with a negative. A bottle will?last a lifetime. I think it is made by Transene now. Sam Reaves ARS W3OHM Owner and Moderator of: LeCroy Owners Group on 开云体育 Electronics and Mechanical Hardware Design Engineering Manager Andritz Rolls Global Research Center (RETIRED) On Fri, Mar 12, 2021 at 11:56 PM Jim Pruitt <jpruitt67@... <mailto:jpruitt67@...>> wrote: Is kpr a negative resist?? Or positive resist? On Fri, Mar 12, 2021, 8:49 PM Sam Reaves <sam.reaves@... <mailto:sam.reaves@...>> wrote: A friend of mine uses cosmetic cotton pads(get them at your local dollar store)? to apply Kodak Photoresist (KPR). When it is dry he places the unexposed boards in an old phone book for storage and pulls one out (all under a yellow safe light) when he needs one. He has used this method for decades. Sam W3OHM _._,_._,_

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