On 04/04/2016 14:22, Chris Hogg wrote:
> On Mon, 4 Apr 2016 13:10:17 +0100, David Lang
> <
davi...@blueyonder.co.uk> wrote:
>
>> On 04/04/2016 11:35, michael adams wrote:
>>> "David Lang" <
davi...@blueyonder.co.uk> wrote in message
>>> news:APgMy.731473$gz.3...@fx40.am4...
>>>>
>>>> It comes in a plastic bottle and has been around for twenty years without that being a
>>>> problem.
>>>
>>> Indeed. Plastic's plastic, it's all the same stuff really.
>
> LOL to that! Ignorance is bliss!
>>
>> As regards acid resistance it pretty much is, One Shot has been used for
>> donkey's years. If it damaged plastic pipes it would be well known & the
>> bottle would have a warning on it.
>>
>> Do you have any evidence that sulphuric acid attacks any kind of plastic???
>
> 'Plastic' is an imprecise and generic term. 'Plastic' embraces a large
> range of chemical compositions. Basically, anything that becomes
> moldable at moderate temperatures can be and is described as 'a
> plastic'.
>
> This, from
http://tinyurl.com/huycaad
>
> Quote
> "Corrosivity to Non-Metals:
> Sulfuric acid attacks plastics, such as nylon (all concentrations),
> polyvinylidene chloride (50-100%), acrylonitrile-butadiene-styrene
> (ABS) (60-100%), styrene acrylonitrile (SAN) (90-100%), polyurethane
> (rigid) (40-100%), polyetherether ketone (PEEK) (50-100%), olyethylene
> terephthalate (PET) (40-100%), high-density polyethylene (80-100%)
> (HDPE), thermoset polyester bisphenol A fumarate (80-100%), thermoset
> polyester isophathalic acid (70-100%), polystyrene (80-100%) and
> ethylene vinyl acetate (EVA)(75-100%); elastomers, such as butyl
> rubber (isobutylene isoprene) (80-100%), nitrile buna N (nitrile
> rubber) (90-100%), chloroprene (neoprene) (75-100%), isoprene
> (60-100%), natural rubber (60-100%), hard rubber (60-100%), soft
> rubber (30-100%), chlorosulfonated polyethylene (CSM) (90-100%),
> styrene-butadiene (SBR) (10-100%), polyacrylate (10-100%),
> polyurethane (10-100%), chlorinated polyethylene (all concentrations),
> nylon 11 and 12 (20-100%), silicone rubbers (120-100%), flexible
> polyvinyl chloride (PVC) (95-100%), low density polyethylene (LDPE)
> (90-100%) and ethylene vinyl acetate (50-100%); and coatings, such as
> coal tar epoxy (10-100%), general purpose epoxy (30-100%),
> chemical resistant epoxy (60-100%) and vinyls (90-100%). Sulfuric acid
> does not attack plastics, such as Teflon and other fluorocarbons, like
> ethylene tetrafluoroethylene (ETFE; Tefzel), ethylene
> chlorotrifluoroethylene (ECTFE; Halar) and chlorotrifluoroethylene
> (Kel-F) (all concentrations), polyvinyl chloride (PVC) (up to 96%),
> chlorinated polyvinyl chloride (CPVC) (up to 96%), polypropylene (up
> to 98%), acrylonitrile-butadiene-styrene (ABS) (up to 50%),
> high-density polyethylene (up to 75%) (HDPE),ultrahigh molecular
> weight polyethylene (UHMWPE) (up to 100%), cross-linked polyethylene
> (XLPE) (up to 96%), polyetherether ketone (PEEK) (up to 50%) and
> polystyrene (up to 70%); elastomers, such as Viton A and other
> fluorocarbons, like Teflon, Chemraz Kalrez and Fluoraz, ethylene
> propylene(EP) (up to 100%), butyl rubber (isobutylene isoprene) (up to
> 80%), nitrile buna N (nitrile rubber) (up to 80%), chloroprene
> (neoprene) (up to 70%, flexible polyvinyl chloride (PVC) (up to 50%)
> and , low density polyethylene (LDPE) (up to 80%); and coatings, such
> as polyester (up to 80%), urethanes (up to 80%) and vinyls (up to
> 80%)."
> End quote
>
> The figures in brackets refer to the strengths of acid to which the
> particular plastic is vulnerable. Note that there are some plastics
> that are attacked by moderately dilute sulphuric acid, but not by
> concentrated sulphuric acid.
>
> So yes, sulphuric acid attacks 'plastic'. The fact that it's sold in a
> 'plastic' bottle, merely shows that the mfrs have carefully selected a
> suitable plastic for that purpose.
>
And the fact that it has been used for years without a problem shows
that the mfrs have carefully selected a suitable plastic for waste pipes.
Do you really think that B&Q, Wickes, Screwfix, Homebase, Amazon, Asda,
Plumbase, Robert Dyas, Tesco, Wilkinsons and every independent plumbers
merchant in the UK have been selling a product that damages waste pipes
for the last 20 years?