Acid (& more) resistant padlocks?
Eric Perozziello
>john...@aol.com (JohnH9049) writes:
>: I have a customer who operates a manufacturing facility. In their
>: processes, they use a variety of nasty chemicals including sulfuric acid,
>: hydrogen peroxide, and acetone, all at very strong concentration levels.
>: They buy from vendors who send these materials in tanker trucks. The
>: truck pull up to a transfer point which consists of a capped pipe leading
>: to the corresponding storage tank. My customer has nightmares about the
>: possibility of a trucker showing up and dumping the wrong chemical into a
>: tank and causing a disaster. They have tried the brass body and anodized
>: aluminum padlocks from Master and American and also the covered padlocks
>: by Hampton. These locks get eaten alive in very short order.
>:
>: Here's the question: Does anyone know of a padlock made of a chemical
>: resistant plastic or ceramic? I sure would like to hear about it.
>
>There should be stainless steel padlocks available. Such a lock would
>resist all the above mentioned chemicals.
Careful there. It depends DRASTICALLY on the formulation of the
stainless steel in question. 400-series stainless are not very (acid)
corrosion resistant, and are designed more for hardness (which might be
found in common use on padlocks where hardness is desired for
cutting resistance.) This is mostly due to the higher iron content of the
400-series.
CRC Handbook on Applied Engineering Science has all the details.
We use a mixture of (H20/H2SO4/H2O2) in our wafer cleaning process.
I could run a test of various stainless formulations (300 & 400) in a
beaker of (H20/H2SO4/H2O2) if there is enough interest.
-Eric
Lee Griggs
In article <38og5p$2...@newsbf01.news.aol.com>, JohnH9049 (john...@aol.com) writes:
>I have a customer who operates a manufacturing facility. In their
>processes, they use a variety of nasty chemicals including sulfuric acid,
>hydrogen peroxide, and acetone, all at very strong concentration levels.
>They buy from vendors who send these materials in tanker trucks. The
>truck pull up to a transfer point which consists of a capped pipe leading
>to the corresponding storage tank. My customer has nightmares about the
>possibility of a trucker showing up and dumping the wrong chemical into a
>tank and causing a disaster. They have tried the brass body and anodized
>aluminum padlocks from Master and American and also the covered padlocks
>by Hampton. These locks get eaten alive in very short order.
>
>Here's the question: Does anyone know of a padlock made of a chemical
>resistant plastic or ceramic? I sure would like to hear about it.
>
>
>as a private locksmith in business for himself, this time.
>ASSA makes a highly pick resistant padlock designed for use in
extremely adverse environmental conditions such as you have
described. Contact ASSA directly for info or locate an ASSA
distributor. If you cannot obtain this info let me know and I will
E-Mail to you.
Lee Griggs
bill nelson
: bi...@hpcvaac.cv.hp.com (bill nelson) writes:
: >:
: >: resistant plastic or ceramic? I sure would like to hear about it.
: >
: >There should be stainless steel padlocks available. Such a lock would
: >resist all the above mentioned chemicals.
:
: Careful there. It depends DRASTICALLY on the formulation of the
: stainless steel in question. 400-series stainless are not very (acid)
: corrosion resistant, and are designed more for hardness (which might be
: found in common use on padlocks where hardness is desired for
: cutting resistance.) This is mostly due to the higher iron content of the
: 400-series.
True.
: CRC Handbook on Applied Engineering Science has all the details.
:
: We use a mixture of (H20/H2SO4/H2O2) in our wafer cleaning process.
: I could run a test of various stainless formulations (300 & 400) in a
: beaker of (H20/H2SO4/H2O2) if there is enough interest.
Yep, the H2O2 makes the sulfuric acid much more effective.
Bill
bill nelson
: In article <38stn8$u...@senator-bedfellow.MIT.EDU> je...@Mit.edu writes:
: >What a novel idea!
: >
: >I don't know of any such locks, but I am positive that it would be possible
: >to create a ceramic based locks. I have seen ceramics which are literally
: >stronger than steel.
:
: How are they on being shatter-resistant?
If the proper ceramic were used, they would be highly shock resistant.
They would also probably be very hard to machine.
Bill
bill nelson
: In article <1994Oct30....@hpcvaac.cv.hp.com>,
: bi...@hpcvaac.cv.hp.com (bill nelson) writes:
:
: >There should be stainless steel padlocks available. Such a lock would
: >resist all the above mentioned chemicals.
:
Not offhand, I have never had the need for such a lock. But, you might
try ASSA - they make a number of locks designed for adverse conditions.
Bill
Brian L. Katon
>I have a customer who operates a manufacturing facility. In their
>processes, they use a variety of nasty chemicals including sulfuric acid,
>hydrogen peroxide, and acetone, all at very strong concentration levels.
>They buy from vendors who send these materials in tanker trucks. The
>truck pull up to a transfer point which consists of a capped pipe leading
>to the corresponding storage tank. My customer has nightmares about the
>possibility of a trucker showing up and dumping the wrong chemical into a
>tank and causing a disaster. They have tried the brass body and anodized
>aluminum padlocks from Master and American and also the covered padlocks
>by Hampton. These locks get eaten alive in very short order.
>Here's the question: Does anyone know of a padlock made of a chemical
>resistant plastic or ceramic? I sure would like to hear about it.
The only thing I have seen (which works in most cases) is the Master
"Environmental" padlock. Although the body is not totally chemical
resistant (if memory serves me right), the shackle has a chemical resistant
coating. Also the lock has gaskets where the shackle makes contact with the
body on both sides and over the bottom half of the body with a flip-open
opening for the key. The shackle and body gaskets are chemical resistant
plastic and are certified for use on petroleum lines (among other chemical
resistances).
Last I looked, American Lock and Supply Co. carried the padlock as well as
the gasket assemblies (to attach the gaskets to a different type of padlock?).
Sorry but I have yet to see a ceramic padlock in my work.
Hope this helps,
Brian Katon, Professional Locksmith