The board is to be submerged into a tank of etching solution, which is circulated through the tank by a water pump. The normal ferric chloride solution works well, but can be expensive and leaves permanent stains. I seem to have a passion for home brew pcb manufatcuring. If you like, you can now edit and enhance the graphics in a graphics software.
However, you need to keep in mind that mixing an acid with a base requires proper procedures. Theoretically it should be possible to etch slightly more than 60 grams of copper with 1 liter etching solution. Uses advised against not for food, drug, pesticide or biocidal product use details of the supplier of the safety data sheet. Etching a printed circuit boards pcb at home is a need that every electronic. The item for sale is 10 ounces 283 grams of sodium persulfate na2s2o8. Disposing or regenerating sodium persulphate etchant on. It is almost nonhygroscopic and has good shelflife. Bp26371, o61141, 06114500 casno 7775271 synonyms sodium peroxydisulfate recommended use laboratory chemicals. Etching a printed circuit boardpcb using sodium persulfate. It turns a very nice blue once the copper starts to dissolve but still remains transparent so the etching progress can be easily monitored.
For alkaline activated persulfate solutions, sodium hydroxide was added to raise the ph to above 10 and to neutralize sulfuric acid formed upon persulfate decomposition. As the sodium persulfate is economic to use, the demand for sodium persulfate is expected to grow in the near future. Two acid types that can be used for etching are ferric chloride eisen3chlorid and sodium persulfate natriumpersulfat feinatzkristall. Etching using sodium persulfate, is my photosensitive. Ammonium persulfate is one of many compounds available for copper etching, and is often used for etching circuit boards in particular.
Sodium persulfate a s a pcb etchant unless you are using an airbubbler to agitate the solution, theres no fume or liquid spray. Mar 27, 2016 etching a pcb using sodium persulfate maddingoogol. Its clear, so you can inspect the etch process as it proceeds. I think these five items are the most important factors contributing to good quality home brew pcb manufacturing. Again, if using our contactetch, it might be a bit dumb to buy that much etchant when you use so little per etch.
Simple pcb etchant made from chemicals you can put in your. I am pretty amazed about using this solution, the pcb needs not to be constantly moved, it is smellfree and it does not paint anything it touches. Disposing or regenerating sodium persulphate etchant. Of course both are absorbing copper ions as the working solution is etching the copper so there is a ramping down of efficiency the more it is used. Etchant for copperplated pc boards it appears that you are using adblocking software. I added about 2ml of water, then 1ml of used sodium persulfate etchant, then a tiny pinch of salt. After the pcb was stripped, it is rinsed under tap water and being neutralized. Etching techniques can be divided into wet etching and dry etching, chemical solution used in wet etching through chemical reactions in order to achieve the purpose of etching, dry etching is usually a plasma etching, its effect may be the impact chips by plasma surface physics, or. Etching using sodium persulfate i had used this material successfully to etch toner transfers done with press n peel. Demonstration of etching process using sodium persulfate as the etchant solution. There are 3 conventionally used chemicals for etching copper. Corrosives powder or liquid work much faster than oxidizers and have unlimited shelf life.
Identification product name sodium persulfate cat no. When the salts are dissolved in water the persulfate ion is formed, which then goes on to oxidize copper to the cupric ion. Really neutralizing the acid would, for example, be done with sodium hydroxide naoh. In addition to positive and negative developers for copperclad boards, we stock ammonium persulfate, sodium persulfate, and ferric chloride copper etchants for your pcb projects. Homemade pcb etching through hole parts part 1 duration. When the salts are dissolved in water the persulfate ion is formed, which then. The growing textile industry is also expected to create a buzz in the sodium persulfate market. It is a strong oxidizer and radical donator for polymerisation. It etches evenly, ensures the sharpness of contours and minimizes undercutting. The sodium persulfate crystals na2so42 or na2s2o8 are a stable salt of persulfuric acid.
Better yet, our new etchant will turn an eerie green color rather than the dull. Providing here the database of sodium persulfate cas no 7775271, sodium persulfate manufacturers, sodium persulfate suppliers and exporters. Etching a pcb using sodium persulfate maddingoogol. It is readily soluble and does not crystallize from the solution. Give 200250 g of sodium persulfate to 1 litre of water delivery unit. Significant decreases in corrosion rates were observed for high ph activated persulfate in contact with copper, brass and carbon steel. Sodium persulfate 10 ounce bottle 98% pure reagent grade. Ammonium persulfate turned out to be superior etchant to ferrous chloride and didnt stink up the place with chlorine gas. Scotchbrite or similar green hard sponge acetone black markers some fine tipped,some with thicker tip pyrex deepwide bowl wooden chopsticks clothing iron pcb design software freeware edition of i. A process of chemically etching circuit boards michigan state. When etching iron or steel with sodium persulfate and tablesalt i got ferric chloride as a byproduct which was really useful to etch copper with.
Etching using sodium persulfate, is my photosensitive board too old. Use your favourite cad software mine is cadsoft eagle to design a pcb layout. In addition, the solution must be hot to etch copper efficiently, and heat causes. Sodium persulfate can be catalyzed with iron, acid, base and heat.
The cost of running this website is covered by advertisements. Unlike ferric chloride, sodium persulfate makes a colorless, clear solution allowing for easy monitoring of the etching process. Etching with air regenerated acid cupric chloride an excellent indepth page on acid cupric chloride etching by adam seychell. It is available in a dry or powder form and must be mixed with water to create the etching solution. I use sodium persulfate to etch a copper board to manufacture home made printed circuit board pcb, and i use the same etching tank on the below photo which has no cover on the top. I etched one more pcb today, and my storage of used sodium persulphate is almost full.
Etching printed circuits boards at home giangrandi. Jul 06, 2014 demonstration of etching process using sodium persulfate as the etchant solution. Alternatively, sodium sulfate na2so4 may be used to begin with and sodium persulfate can be generated from that by electrolysis. Sodium persulfate is the inorganic compound with the formula na 2 s 2 o 8. Klozur activated sodium fmc chemicals has recently emerged as a robust chemical oxidant for treatment of soil and groundwater contamination. This also makes it extremely difficult to touch up traces with a cdmarker prior to etching, as the ink gradually dissolves away into the heated solution. It is the sodium salt of peroxydisulfuric acid, h 2 s 2 o 8, an oxidizing agent.
Ive got everything i need but just want a few tips on the use of sodium persulfate for etching. You can also find a detailed tutorial on etching at muriatic acid etching tutorial. B to prevent premature breakdown of the solution, do not operate in excess of 50c. Ammonium persulfate potassium persulfate sodium persulfate solubilities of persulfate salts maximum solubility of persulfate salts in water solubility ammonium potassium sodium g100g of h 20 persulfate persulfate persulfate 25.
In fact, after etching a few boards with this solution, you will have successfully made acid cupric chloride see below. I have been etching pcbs since i was about thirteen im 55 now. Sodium persulfate 10 ounce bottle 98% pure reagent. Etching your own circuit boards is tons of fun, but etching requires strong chemicals to dissolve the copper plating on blank circuit boards. Pack of 500g high purity ferric chloride sodium persulfate used to make pcb b32. Mar 03, 2011 this is a variation of the etchant i have used for a very long time. Prepare pcb using dedicated software without mirror image. Imports of sodium persulfate in usa manufacturers of sodium persulfate buyers of sodium persulfate in usa. Video picks up after a copper clad board has had traces printed on it with a laserjet printer. Sodium persulfate b327 100g a compound for etching of printed circuit boards and pickling of copper. I already added copperwire to the solution, but i am unsure if that is sufficient. The companys current production capacity of ammonium persulfate aps is 50,000 tons per year, and 38,000 tons annually for sodium persulfate sps,7,000 tons annually for potassium persulfate kps. I spend a good deal of time looking to improove the process. The item for sale is 5 ounces 142 grams of sodium persulfate na2s2o8.
Pcb etchant solutions engineering technical pcbway. Etching using sodium persulfate, is my photosensitive board. Sodium persulphate an oxidizer, called sp whats the difference. At such a relatively high etching temperature, any direct contact with the etchresist causes it to flake away or become pitted, leading to a terrible looking pcb. I am trying to etch my first pcb ever, i have used the inkjet transparency method to expose my photosensitive bungard board and developed it using sodium peroxide. You can etch a pcb by yourself, in a lab or even at home, through a simple and. It has set up its owned specialized industrial park of persulfates including the first and second stages of project. Also the strict regulations for the disposal of waste water from the chemical industry can be a major driver for the sodium. Persulfate is safe to handle and has a solubility of approximately 35% under field conditions.
Oct 30, 2011 i added about 2ml of water, then 1ml of used sodium persulfate etchant, then a tiny pinch of salt. The developed pcb is etched with a 220 gl solution of ammonium peroxydisulfate nh 4 2 s 2 o 8 a. The chemical reaction causing the metal to dissolve is a corrosion reaction involving the persulfate ion and the copper atoms on the board. Ultrakeet australia ferric chloride vs ammonium persulphate. This is a variation of the etchant i have used for a very long time. I wonder if it is okay to keep it like that at the room temperature or would it evaporate. Sodium chloride reacts with copper sulfate to produce sodium sulfate and. The directions on the label suggest a dilution of onehalf pound by weight to one gallon of water, which i translated to onequarter ounce by weight about a rounded teaspoon by volume per four ounces for making a small batch.
They can even have catalysts added which then allow them to be used with tin tinlead resists. I have been etching pcbs since i was about thirteen. Sodium, ammonium, potassium persulfates all make good copper etches. How to create a pcb etchant that automatically improves after. It also treats a wide range of organic compounds including. A process of chemically etching circuit boards application note. Safety data sheet creation date 24nov2010 revision date 18jan2018 revision number 3 1. How to make ammonium persulfate to etch copper our pastimes.
Video picks up after a copper clad board has had traces. Indeed it was a white dust that should be mixed with water to form the etching solution. Making circuits is great but what if you want to make your. Klozur persulfate corrosion and material compatibility with. Sodium persulfate market persistence market research. These sodium persulfate manufacturing companies are delivering best quality products to the clients on time. Circuit specialists carries a number of lowpriced photochemicals manufactured by industry leader mg chemicals. The reaction started as soon as the salt was added and produced quite a bit of heat, i think it nearly boiled, which is why you need water ready to add to cool and slow the reaction.
A process of chemically etching circuit boards application. Test, etching, ammonium, persulfate, method created date. This way, you can regulate how much heat gets to the solution and keep it at its optimal etching temperature, which is around 50c for persulfate. Neutralizing sodium persulphate with copper wire doesnt neutralize it, it increases the problem. As a side effect, all traces of etching liquid and copper will be removed from the board and. Sodium persulfate as a pcb etchant unless you are using an airbubbler to agitate the solution, theres no fume or liquid spray. Sodium persulfate is commonly used as an etchant for copper, iron, brass, and other metals. How to create a pcb etchant that automatically improves. Making your own metal core printed circuit boards for. Theoretically it should be possible to etch slightly more than. There are three common pcb etchants available in electronics stores. Question about sodium presulphate to etch pcb picaxe forum. Have a look at our affordable photofabrication kit which includes three pcbs, developer.
Although etching can also be done in simple plastic boxes, the quality of the results will improve dramatically when using a machine that controls temperature and constantly keeps the fluids in motion. Sodium persulfate sodium peroxosulphate short form naps, trade name sodium persulfate is the salt of peroxodisulphuric acid. Etching with sodium persulfate requires no heating baths and produces hardly any fumes. The etching solution used for this application note is sodium persulfate, although there are other options available.
Klozur persulfate corrosion and material compatibility. This part of the process seems to have gone well, i can see the traces clearly on the board in a darker shade. Pcb etching technique and analysis of etching solution. Due to its high oxidation potential it can cause ignition under certain conditions.
Etching pcb is to use the materials of chemical reactions or physical impact of technologies that are removed. An activated alkali metal persulfate effectively repulps neutralalkaline wetstrength broke and decolorizes dyes and optical brightener. Luckily, we can whip up our own etchant at home with everyday chemicals. View detailed import data, price, monthly trends, major importing countries, major ports of sodium persulfate. Feb 28, 2017 another common etchant is ammonium or sodium persulphate. Chemical etching is a process of printed circuit board pcb manufacturing that provides. Sodium persulfate is an alternative to ammonium persulfate that will work with etch resist pens. Wikipedia refers to pcb etching use, so i am pretty sure this is what i purchased. Alternatively, instead of disposing of the etchant, you can reuse it again and again. Aug 28, 2009 i just saw this on maplins and a couple of other sites re.
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