Haidar Posted October 10 Report Share Posted October 10 (edited) In rainy and cold season i can't figure out what is going on with my casting slip. Well, i don’t know much about casting slip i just have known a process of making it and maintaining same density(175) (in 100cc) and viscosity (40 secs avg) all season. Like, its raining today (28-32 degree celcious) but my slip is stuck with mold. If any how i pick it its just broke bcz of not getting strength in itself. Now help me plz, what density and viscosity i need to follow now in these rainy days as well as upcoming winter season (like 18-24 degree celcious). Sorry for my poor english writing. Edited October 10 by Haidar Apology for english writing mistake Quote Link to comment Share on other sites More sharing options...
Jeff Longtin Posted October 11 Report Share Posted October 11 Welcome to the Forum Haidar. Are you mixing the slip yourself? Can you post the recipe? I have found mold (green stuff) to be more recipe related and not so much weather related. Kaolin's from England grow mold quickly while Kaolin's from the US grow mold very slowly. Do you know where your Kaolin comes from? The strength issue could be related to over deflocculation. (If your deflocculation is off than you may be adding too much water to make the slip thin.) Quote Link to comment Share on other sites More sharing options...
Chilly Posted October 11 Report Share Posted October 11 On 10/10/2024 at 4:52 PM, Haidar said: winter season (like 18-24 degree celcious Oooh, I wish winter in the UK was this warm . I have problems with slip taking a long time to set up in temperatures lower than 15C. The worst weather is damp. It can take 10 minues in dry 20C and 30 to 60 minutes in damp 10C. I have not had problems with strength, only the amount of time it takes to become thick enough to pour out and dry enough to un-mould. And your English is very good, I understood your question. I hope my answer might be a little bit helpful. Sorry if it doesn't answer your question. Quote Link to comment Share on other sites More sharing options...
PeterH Posted October 13 Report Share Posted October 13 (edited) On 10/10/2024 at 4:52 PM, Haidar said: In rainy and cold season i can't figure out what is going on with my casting slip. Any chance it's a humidity issue and your molds aren't drying out fully between pourings? Might be worth drying one out for longer between castings to see if it makes a difference. PS An old thread discusses force-drying molds. This post seems to give the least-intrusive method. From another of the posts - put some supports under the mold so that the bottom dies out at a similar rate as the rest of the mold.. Edited October 13 by PeterH Quote Link to comment Share on other sites More sharing options...
Mark C. Posted October 15 Report Share Posted October 15 I live in a rainy area and what helps is blowing air over the molds with a 2foot x two foot box fan to dry them and also to keep air moving over them PeterH and jacksong 2 Quote Link to comment Share on other sites More sharing options...
PeterH Posted October 16 Report Share Posted October 16 On 10/11/2024 at 6:02 PM, Chilly said: Oooh, I wish winter in the UK was this warm . I have problems with slip taking a long time to set up in temperatures lower than 15C. The worst weather is damp. It can take 10 minues in dry 20C and 30 to 60 minutes in damp 10C. @Chilly Might be worth playing with a cheap humidity meter. First in the room and then on/near the mold. Then possibly with a cold fan to keep a steady air-flow over the mold. e.g. https://tinyurl.com/3n93pzcz BTW Of course, warming the air reduces the (relative) humidity. Quote Link to comment Share on other sites More sharing options...
PeterH Posted October 17 Report Share Posted October 17 (edited) 19 hours ago, PeterH said: Of course, warming the air reduces the (relative) humidity. For example, if the humidity at 10C is 80% increasing the temperature to 15C reduces the humidity to about 60%. Edited October 17 by PeterH Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
jacksong Posted October 17 Report Share Posted October 17 In Sanitaryware casting process, there is a type of mold called spagless, you can Google it, of course, it may be a bit complicated while very helpful for demolding. PeterH and Hulk 2 Quote Link to comment Share on other sites More sharing options...
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