hmm, you got me on the long time exposure - the sunlight in this neck of
the woods are full in the winter time (facing south), but not much in the
summer (good design of the window location).  However, the window glass
shouldn't block the UV, at least anything below 400nm are all in taken in
(the stuff was 1.5 meter inside the balcony door near the floor).  The
plastic must have weak chain around 400nm...(the backside not exposed to
the light still ok).
                        jk
> Well, Joyce, my first remark is exposing DVDs/VHS tapes to sunlight is a
> big mistake, especially in the greenhouse of a plastic case.
> "Direct sunlight can harm VHS tapes
>
> One of the most damaging environmental conditions that can degrade the
> longevity of a VHS tape is if it has been stored in direct sunlight.
> Direct sunlight dramatically reduces how long a VHS tape can last."
>  From http://www.memoryhub.com/news/how-long-do-vhs-tapes-last/
>
> The same can apply to  optical storage, especially R types.
>
> I'm pretty sure that plastic degradation does not occur with a couple of
> minutes, or even hours, exposure to sunlight through a window which
> blocks UV. Personally, I see no objection to using bioplastics for
> packaging video records of any type and I would not shoot the 'engineer'
> who selected those plastics.
>
> I take on board your point about recycling bioplastics, something that I
> haven't considered. However, I must ask that, if they become a powder at
> the drop of a hat, how can you recycle them?
>
> Best regards,
>
> Brian.
>
> On 03/07/2015 16:01, Joyce Koo wrote:
>> I just have to vent: some of my VHS and DVD cover plastic overlay turn
>> into dust upon expose to the sunlight.  Who is the engineer to select
>> bio
>> degradable plastic as cover overlay should get shot at... dealt with a
>> plastic bag that holding my design book last year with similar
>> outcome...
>> Hopefully, no body put those stuff (not in the plastic recycle bin that
>> eventually went mixed with others) in some of bridge rebar coating or
>> something like that... the half baked engineer plus politically
>> correctness mentality is really scary.  (don't know what else of those
>> friendly materials was into our life - both dvd and vhs are made in
>> china... would think vhs would be safe -before friendly caught on
>> fashion... but appear to be not the case...).  Try to pick up those
>> small
>> crystalline static dust is not fun... it is everywhere...
>> on this cheery note, Have a nice weekend.
>>                        jk
>>
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