there is no one substance labeled ‘plastic’ but more then a dozen, of only the thermoplastics, and they of course have different melting points; in fact they may have not a real melting point like water or metals but a softening & melting range.
And then you have plastics that don’t have a melting point or range at all, the thermo-hardening plastics. ( Bakelite etc ).
Temp use range :
Softening & melting points :
3th question in a row here that can best be answered by :
water jar cap making machine
And you get dozens of answers.
If you were asking for household ovens like normally found in kitchens i’m afraid to disappoint you, they normally do not get to over 660°C.
But little and less little hobby ovens for e.g. ceramics can easely reach that temp & higher.
Even a metal can holding alu scrap & heated with a propane torch can do it;
or more elaborate but cheap build it yourself metal foundry.
Of course its better to do it always outside.
… As you can see in many Utube vids.:
Very incomplete question.
Can not be answered if all the details are retained.
There is more then 1 standard size for this blocks & size is not specified.
Size of the lot says noting about the size of the house.
It is not specified if there is also a cellar, an attic/sloped roof.
And if it is a bungalow or 2 or 3 floors building.
Depends on your use.
Is it for degreasing machine parts
or for an extraction ( before) analysis
or as a reagent ?
In the last example you may not find a good alternative,
but for extracting a grease or an oil or a resin from a substrate you sometimes may use Tri ( -chloroethylene )
an example where it worked perfectly :
i use Tri on a daily basis.