tintinmt Posted February 25, 2018 Share Posted February 25, 2018 I need to split two rear lights to make up one good unit. I have read the previous posts on here but most are quite old now. I dare say that the method remains the same. I have had one unit in the oven for 30 minutes at 90 degrees c wrapped in a towel and the glue is showing little (if any) sign of melting. I am looking for a guide to temperature and time in the oven please. Obviously, I don't want to melt the lenses, but so far I don't think I am close. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 25, 2018 Share Posted February 25, 2018 I need to split two rear lights to make up one good unit. I have read the previous posts on here but most are quite old now. I dare say that the method remains the same. I have had one unit in the oven for 30 minutes at 90 degrees c wrapped in a towel and the glue is showing little (if any) sign of melting. I am looking for a guide to temperature and time in the oven please. Obviously, I don't want to melt the lenses, but so far I don't think I am close. I did this the other week on an audi RS4 headlight and did 150 degrees for 10 mins and it simply peeled open! I did the one with the bad lense first to try it and also kept checking it every few mins. Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 26, 2018 Author Share Posted February 26, 2018 Great - thanks. I got the strong impression that 90 degrees was too low. Did you wrap the unit with a cloth in the oven? Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 26, 2018 Share Posted February 26, 2018 Great - thanks. I got the strong impression that 90 degrees was too low. Did you wrap the unit with a cloth in the oven? No I just put it straight on the shelf the only issue I had was it touched the back of the oven where the fan housing (I had it on fan setting) and the heating element is inside and it did melt very slightly but it straightened out with a little heat. Good luck I did look on you tube too but one said 220 degrees for 10 mins so I just guessed:D Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 26, 2018 Author Share Posted February 26, 2018 According to the unit the lens is made of PMMA (plexiglass) and wikipedia says that the melting point is 160. Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 26, 2018 Author Share Posted February 26, 2018 The body seems to be made of PP-t20 which has a melt point of 240 degrees but a maximum operating temp of 100. I am going to reduce the amount of material wrap and increase the oven temp to 100 and if that doesn't work to 110 centigrade. The question is how long in the oven to get the whole unit evenly heated? Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 27, 2018 Author Share Posted February 27, 2018 Well. I can confirm that 15 minutes at 150 degrees does it, but the glue was still pretty firm at that point. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 27, 2018 Share Posted February 27, 2018 Good to hear that the 150 worked as it did for me. The best part for me was when I announced to the missus I was doing some baking, then she realised what I meant Quote Link to comment Share on other sites More sharing options...
mellonman Posted February 27, 2018 Share Posted February 27, 2018 I'm glad your updating the temps , as i cant remember the correct temp but your on the right corse as i done mine from a previous method and worked well Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 27, 2018 Author Share Posted February 27, 2018 Yes - thanks blythmrk - I worked my way up to that temp. The proof will be when I do the next one. I have realised one mistake I was making. I was trying to pull the reflectors off with the rear cover - which was never going to work. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 27, 2018 Share Posted February 27, 2018 Trial and error plus practice makes perfect Quote Link to comment Share on other sites More sharing options...
tintinmt Posted February 28, 2018 Author Share Posted February 28, 2018 Second one done in one take. 15 minutes at 150 degrees. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted October 3, 2020 Share Posted October 3, 2020 Second one done in one take. 15 minutes at 150 degrees. Bumping an old post! 15 mins at 150 degrees was that wrapped in a towel? Also any advice on removing the chrome from the rear of the unit or is it pretty common sense? Quote Link to comment Share on other sites More sharing options...
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