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Rapid Prototyping Stereolithography

Rapid Prototyping Stereolithography

well we’re standing here in front of the convection oven I realized we get asked a lot of questions about heat deflection properties for a lot of our resins now we can supply you with with the spreadsheets if you want to see them but we thought we’d do an experiment to kind of show a real-world example of how these proper materials react to the heat yeah like brian says one of the frequently asked questions

we get is hey is this part going to melt on me if I’m at elevated temperatures and I guess the short answer to that is going to be no stereo lithography resins are thermal sets which is an irreversibly curable process so the part itself is not going to melt it’s different than a thermal plastic like a typical injection molded part where in those cases you can melt something and shape it you can melt it again and reshape into different things so it’s very recyclable thermal sense like stereo lithography residents are not

so they can be recycled in terms of the filler material but once it’s got its shape it’s got its shape so again we’re gonna do some experiments here today and see how heat affects the materials as we slowly ramp up temperatures well basically what we have is a sample that represents each of the resins that we offer here realize these are an order of heat deflection temperature so there mark the labeled in order of least resistant to most resistant ending up with the so most 18 for 20 which is thermally post cured

okay we’re gonna start our experiment here right around 100 degrees and we’re gonna leave this in here for a little while and see how a hundred degrees affects these parts here one of the things that we do discourage is ground shipping especially across the country in the middle of summer due to the effects of heat in the backup say a UPS or FedEx truck or a not climate-controlled dock so we thought this might be a good start okay we’ve had this first round of parts in here for about 20-25 minutes or so

so we’re gonna open things up here and they just kind of give everything a little squeeze and see how it feels again this was right around I believe a hundred degrees is what we were starting with so at this point everything is still feeling pretty good about like the original 94 20 is getting pretty soft again that’s got one of the lower heat deflection temperature zon it so that one’s getting pretty easy to squeeze across the board there 80-120 is feeling awful soft as well which makes sense because those are our two most flexible materials to begin with so they’ve got a lower heat deflection with the most flexibility I also feel I care 25 and

our 3d printer material of the m3 black off of the project 3500 HD max is still this is the one non-sterile lithography material that we’ve got in there although it is still a flash cured system so yeah right now I think all of our flexible materials are we’re starting to see some impact as low as 100 degrees so we’re gonna ramp up the temperature a little bit here okay so the parts have been baking in here for several minutes at 130 degrees Fahrenheit at this point we expect to see that parts getting actually really flexible really pliable and really saw

so let’s find out they see here that horrible take most of the pieces here make here 60 still got a little bit of resistance to it what I would what I’m kind of experiencing here is the parts are being a little bit oily they don’t feel like they’re normal dry selves but these are normally pretty stiff pieces here that were able to totally make them touch with these at room temperature these parts would actually break if we try to touch the parts together I think we’re going to jump up again here we’re at 130 so we might jump up to 150 175 and

we’ll get back to you all right so the parts have been baking for approximately 30 minutes at about 175 degree Fahrenheit I think what we’re gonna find is just really really soft parts so okay yeah we definitely got some splatter going on here on the tree yeah we’re getting some discoloration too in the parts that we see so yeah this is a really turned into a rubbery like Wow good girl I mean it doesn’t take any effort at all to squeeze these together I’m noticing the parts still have a little bit of memory to them though they do bounce back and we’re starting to get a little softer on the 18 420

so we’re we’re approaching some deformation so what you can definitely see here under increased temperature any kind of load you’re gonna see some deformation that’s the best thing to point out here so I think we’re going to give her one more run here at over 200 degrees and see what we can do with the 18 420 okay we are back here realized at the convection oven we’re currently in the 220 225 range temperature so this is gonna be our final stop on the tour today so we’re gonna see where things are at again things have been in here for you know 20 minutes half an hour letting them come to temperature and

we’re gonna see more discoloration on the parts and at this point other than the parts being quite warm we’re really able to tweak them and twist them and to just about any shape we want they’re becoming very very pliable very rubbery they’ve almost got a short a feel to them on the durometer scale all the parts are quite flexible even the 18 420 has got a lot more flex of course we have exceeded its heat deflection temperature as well so at this stage I think we’ve I think we’ve shown what elevated temperatures can do to a cell eight parts yeah and

you know for for a high heat application we’ve definitely proven the worth of the the thermal post cure option that’s available wholly with the 18 420 everything else seemed to really break down around that 130 degree mark so you know it’s valuable for us as well as those engineers looking to find a solution for you know high heat applications you know most of these resins will probably hold up just fine under a short blast of heat above that 130 degree temperature mark as you can see that they all have sort of a memory they’re bouncing back in the shade but for long-term subjection that he definitely recommend the post curing from 420 resin I think the next step if we were to check with anything is to see what would happen when the parts come back down to temperature down to room temperature and

see if they I guess regain their properties and in a sense we’ve kind of taken them all through a thermal post cure at this point so yeah we’ll just have to see what happens but I think this has been a good indication of how heat can affect your parts of course this is not under load except when we’ve been squeezing the parts so you know depending on your particular application you know any of these resins may work if there’s low no load depending on the short burst of heat or a longer burst of heat so you know feel free to call us with any further questions and we’d be happy to answer them here we are a day later we were up to about 225 degrees yesterday we let the parts come back down to room temperature overnight and

it does appear that everything kind of went back to its original properties at least as far as a you know flexibility goes everything’s back to where it approximately was originally before we started ramping things up so other than the discoloration and then you know we know for a fact that I guess this process we took them through did heat treat them in some respect so that what this proves is that under load and

elevated temperatures the parts are going to move if it brought back down to room temperature you’re gonna see the original properties return so with that said you know short bursts of elevated temperature is probably not going to affect your application too much about what you’re doing with it but elevated temperatures for extended periods of time are obviously going to see some probably ill effects you

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