A few weeks back, the local BM delivered me a few sheets of galvo
corrugated wriggly tin sheet.
When we unloaded 'em and stacked 'em, they were covered with a white
powdery bloom. I probably should have sent 'em back there and then, but
didn't. We stacked 'em with enough space for air to circulate.
I've just started to look at 'em properly now. The bloom isn't cleaning
off well at all, and has clearly gone through the galv in quite a few
A good cosmetic finish is required... The Domestic Customer is less than
What think you to the reaction I'm likely to get when I go back to the
(indie, just two outlets) BM?
A little bit of white bloom might be expected (zinc oxide) but if the
galvanising has been compromised then it is not fit for purpose.
If they replace it then check every sheet, otherwise money back and try
elsewhere - maybe a sheet goods/roofing specialist where there is higher
stock turnover compared to a BM
On Tue, 01 Dec 2015 13:55:10 +0000, Bob Minchin wrote:
Went back, had a nice little chat, and then checked their store with 'em.
EVERY SINGLE 660mm wide - of all lengths - was the same. But they'd got a
stack of ~1100mm wide - of various lengths - which was all immaculately
spotlessly perfect. They'll deliver some sheets of that, and take back
the other, in a day or two. No problem, very apologetic.
On Wed, 02 Dec 2015 17:20:18 +0000, Bob Minchin wrote:
Oh, yes. The other local BM is a similar distance from here. But they're
part of a small regional chain now and, since they were taken over,
they're just a bit more... corporate. Before, they were a little hole-in-
the-wall Ronnie Barker and brown coats place.
But it's funny - there's some stuff I'll get from one and some from
t'other, and I don't really know why.
It could be it was not degreased correctly when it was plated. The presence
of zinc is not a problem, but hols in the galv most certainly are.
The problem is I don't think they can legally use cadmium and pasivate these
days to get that wonderful slightly coloured finish.
I supposes its like most stuff these days, prices cut and corners cut to
match in the processing.
I noticed some years ago that aerial clamps and hardware were not being
galvanised as well as they used to be, resulting in the threads rusting
after a few months and the surfaces pitting in a couple of years. Sigh.
From the Sofa of Brian Gaff Reply address is active
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Agreed. There are three main types of zinc coating: hot dip,
electroplate, sheradize. I believe electroplate is much more common now
and will be what you have on aerial clamps and quite possibly the
corrugated sheets. You still get hot dip on agricultural stuff.
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