Wax Temperature & Processing

From:Victor Windeyer

Dear Histonetters,

A) Does anyone know why the manufacturers of the histological paraffin
waxes(eg Paraplast) put a warning on the package not to heat the contents 
above 62C?

I have heard reports of the following but have not witnessed:

1.  Polymers precipitating from the molten paraffin above this temperature 
limit which changes the physical properties (increases melting point, makes 
wax softer and hence blocks are harder to cut... )

2.  There might be toxic additives that are released above this
temperature.(although not specifically addressed in the MSDS).

Is this correct or are there other reasons?

Thanks in advance,

Vic Windeyer

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