Re: Dichromate as a Contrast Agent for Palladium

Jeffrey D. Mathias ()
Fri, 24 January 1997 3:09 AM

Jodie Allen wrote:
>
..
> I've been meaning to ask about the hazards of ammonium dichromate versus
> potassium dichromate. There was an article on gum printing in Shutterbug a
> while back that said something to effect that potassium dichromate is prefered
> due to the hazards of using ammonium dichromate. Any comments?
>

Wayde,

Potassium Dichromate has a hazard rating of 4-0-3-3.
Ammonium Dichromate has a hazard rating of 4-1-3-3.

The ratings are indicative of helth-flammability-reactivity-contact.
4=extreme
3=severe
2=moderate
1=slight
0=none (no scientific data)

Both materials have a storage recommendation of "yellow" or "reactivity
hazard. Store separately away from flamable or combustable materials."

And yes, the Ammonium Dichromate is more hazardous because is posesses a
flammability hazard with all else being relativily equal. This type of
information is readily available Jeffrey.D.Mathias@worldnet.att.net (for free) in the catalogs of chemical
suppliers.

Jeff

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