Mold Material for refractory cement?

[Ahmed Sayeed]

Hello,

I design molds for years and always made metal and plastic injection molds. Now I got a new work about refractory cement mold. It is a material used for fire bricks. Cement will be filled into mold then with vibration, it will reach everywhere.

I just want to ask that, if anyone has experience with this cement? What material should I prefer for mold? Cement heats up to 80 degree during process and I want my mold to be in good shape and re-use for many.

 

[Ahmed Sayeed]

Will styrofoam be fine with 80 celcius degree and chemical affects of cement?

 

[simon field]

I very much doubt that a soft mould tool would last 5 minutes - mild steel seems the obvious choice to me.

 

[Ahmed Sayeed]

I very much doubt that a soft mould tool would last 5 minutes - mild steel seems the obvious choice to me.

Thank you Simon, I make molds for injection molding so I always use steel but this time they asked for plastic or wood material. I don't know if it will last long but probably costs are problem for customer

 

[Ahmed Sayeed]

I kept searching and people mostly say about UHMW and PTFE materials

 

[Ahmed Sayeed]

I will also write here, when I see the result.

 

[simon field]

We do GRP so I’m of no good to you I’m afraid.

I’m guessing you’d need a CNC’d block of PTFE potentially, but I don’t know anything about the stuff other than it gives a very easy, clean release from the mouldtool and lasts for ages.

 

[simon field]

You may be better off posting this thread in the
‘Tradespeople’ forum.

 

[Ahmed Sayeed]

thanks Simon for your help.