Date: Tue, 13 Jan 1998 16:06:50 -0500
IS ANYONE OUT THERE USING SODIUM HYPOCHLORITE AS A REPLENISHING AGENT
FOR CUPRIC ETCHES?
AM LOOKING FOR A SAFER AND MORE MANAGEABLE METHOD OF GETTING THE BATH
STRENGTH UP WITHOUT USING THE HIGHLY TOXIC CHLORINE GAS.
Cyndi Brown
Date: Tue, 13 Jan 1998 14:03:09 -0800
We use 50% hydrogen peroxide instead of chlorine gas or sodium
hypochlorite. It gets you out of the toxicity concerns; however it adds
the concern of a strong oxidizer. If you have more than 50 gallons of
50% peroxide in a closed container (or >10 gallons in an open container)
you could also change your building occupancy code, if you are not
already an H3.
John Sharp
Date: Wed, 14 Jan 1998 16:04:31 +0000
Do you have any information for sodium chlorate as an source of
chorine in cupric etching? At Pacific Circuits we have used this for
many years in power and liquid. If I can help call me at 360
757-7474 (Rhidian Grant)
Reply-To: "ComplianceNet Mail Forum."
Sender: ComplianceNet Mail Forum
From: "Brown, Cyndi"
Subject: SODIUM HYPOCHLORITE vs. CHLORINE GAS
Manager, Safety & Environmental Affairs
tyco Printed Circuit Group, Inc. Manchester Division
cbrown@tpcg-manchester.com
Phone: 860-646-3800 or 860-533-3123
Fax: 860-649-0939
Reply-To: "ComplianceNet Mail Forum."
Sender: ComplianceNet Mail Forum
From: "Sharp, John"
Subject: Re: SODIUM HYPOCHLORITE vs. CHLORINE GAS
Cyndi,
Reply-To: "ComplianceNet Mail Forum."
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Comments: Authenticated sender is
From: Rhidian Grant
Subject: Re: SODIUM HYPOCHLORITE vs. CHLORINE GAS