The green stuff on a PCB

[duncan303]

Luciano

After I apply the spray SK10 on the PCB, I bake the PCB for about 10 minutes in a preheated
pizza oven at about 100°C. After this treatment, the SK10 film on the PCB is dry.

I remember now, I thoughtlessly used the domestic cooker once, never again!!!!!

I went out and bought a small pizza style oven instead; that I was intending to convert into a reflow but the heat was neither uniform or hot enough to be usefull. also the tray was too small to be of use on that project, so it ended up back in the kitchen as a cheese/sardines on toast oven, oh well... so you win some you.......

That also reminds me that I also went back to sparkfun today, not only because of the earlier post but also because about the same time as the oven debacle, I was attempting reflow in a large frying pan inspired by sparkfun. Hasn't he come a long way, looks like he may be making a few bob, good on him.

[duncan303]

Hi Dave,

Sorry I wasn't thinking with my practical hat on, I was just being anally retentive about my precious little tips

if I cross contaminate the tips even with lead<>leadfree they simply will not "wet" properly I am probably doing something really wrong, maybe time to look at a hot air rework station they seem to be very popular. Although I just know that if I breathe on a 0402 I will never see it again Its getting to the point where I can't see them anymore I just hope I know where they are!!

Duncan

[duncan303]

Hi Skimask

oil burner for a furnace, burns oil at something like a billion degrees, they take used motor oil too.

OMG I assumed my oil was being reprocessed recycled. How typically stupid. I can be so niave sometimes!

anyway I am glad that I am not alone in some of my more bizarre habits of waste sorting.


You lot over there are generaly a couple of years ahead of us, we (europeans) are just starting to deal with recycling but only through threats of massive fines and thats our governement being fined by some foreigner called Brussells!.

So our local authorities are running around like headless chickens, literally.

I referbed a old A3 printing heat press that had fluffy asbestos in it, so I phoned up the local council to ask them where I dispose of it, a few hours later and many transfers, I was eventually informed that there was "NO" facility available to members of the public in the county to dispose of it. They were terrified, no joke. I've still got it.

I air out the aromatic organic solvents as much for my own sanity as for the environment

[skimask]

I assumed my oil was being reprocessed recycled. How typically stupid. I can be so niave sometimes!

I'm not even 100% sure that burning it at high temp's is good enough. Think of all the metallic contamination that's probably in there (especially if it came from a worn out motor). The guys at the HAZMAT shop said the costs involved with actually recycling oil are way too high, and you basically end up with the same problems anyways.

You lot over there are generaly a couple of years ahead of us, we (europeans) are just starting to deal with recycling but only through threats of massive fines and thats our governement being fined by some foreigner called Brussells!.

I don't know about that. The gov't still hasn't switched over to lb-free soldering practices yet. In fact, it was only touched on in that micro-mini-circuit card repair class I went to last year. And if you look at all of the boards coming out of SE Asia these days, practically every one of them has lb-free markings on them.

I air out the aromatic organic solvents as much for my own sanity as for the environment

And again, as far as the HAZMAT guys are concerned, most commercially available products these days can be aired out without much worry. The main concern was the ozone depleting stuff (freon, etc). Good luck finding any of that these days.

As far as the cross-contamination goes...In the shop, I've got 2 sets of stations, one set for lb-full and one set for lb-free. If I get any lb contamination on the lb-free tools, those parts go over to the lb-full station. So basically, when I need to buy stuff, I buy it for the lb-free work, and move it over when I screw up
And, the instructors at that school said if you get lead into a lb-free environment, things get all screwy. You end up having to pump a load of heat into the product to get it to do anything for you...and by that time, you probably end up melting the PCB

[The Master]

Im back home now. I cant find the laquer stuff. I know its here somewhere but with the state of this place at the moment i doubt ill find it soon. I do have my solder to hand though. Its "Lead free solder. Composition: SN 99.3% CU 0.7% 1mm diameter"

[mackrackit]

Hi Duncan,
I was not thinking about Pb free stuff. I am still a 60/40 type But Pb is the least of my worries. At my day job, one of my duties is heading up our HAZWOPER team. That stands for Hazardous Waste Operations and Emergency Response. Mostly the emergency response part.

As far as your waste disposal goes, sounds like you are "OK".

One thing I have heard about waste oil, and I do not know if it is true. It gets hauled to the cost and loaded on a ship. Once past the twelve mile limit a valve is turned. Now it is a fuel.

[Archangel]

Hi Duncan,


One thing I have heard about waste oil, and I do not know if it is true. It gets hauled to the cost and loaded on a ship. Once past the twelve mile limit a valve is turned. Now it is a fuel.

That is what the recycler told me too . .

[duncan303]

Hi Duncan,
One thing I have heard about waste oil, and I do not know if it is true. It gets hauled to the cost and loaded on a ship. Once past the twelve mile limit a valve is turned. Now it is a fuel.

have had a reply

Dear Duncan

Thank you for your query regarding engine oil recycling. I have also
received a telephone message. Apologies for the delay in reply, I have
been away on leave.

Used engine oil is collected from all of our 19 recycling centres by a
company called Malary Oils.

Most oil recycling companies use a similar process. Once the oil is
collected it is taken for testing. Dependant on it's quality some of it
will be sent for disposal (which will either be incineration or a
hazardous landfill site) and the rest can then be reprocessed. During a
slow heating process water is separated from the oil. The water then
goes to a water treatment facility. The oil is then filtered and acts as
fuel for high temperature combustion furnaces and boilers.

I hope that this information is of use. Please do not hesitate to
contact me should you have any further enquires.

Regards,

Not too bad a reply, suppose its landfill vs international waters then.

I think I might delve further and see if the criteria for incineration/landfill is degree of contamination.



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