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To Jim Koehler and all:
I just called Fisher-Price to check on the availablity of their
'Rock-a-Stack' toy which includes the large blue ring that Jim
suggests for his toroidal sensor. I had not been able to find the
thing locally but considering where I live that does not mean much.
Anyway - I called and talked to a young lady in customer service who
seemed very knowledgeable and who had the information at her finger
tips. According to here that toy is NOT made anymore. It has been
replaced by TWO newer versions. One which is SOFT (presumably
spongy) for babies and a harder one for older children which is
SQUARE.
I of course, do NOT know what type of plastic the "hollow blue ring"
was made of BUT I just checked "Materials Properties" for 7 types of
plastic: Polypropylene, HDPE, LDPE, PTFE, Acetal, Nylon and
Polystyrene. All of these seven SEEM TO ME to lack one or more
properties which I would think would be necessary or at least
desirable for a liquid filled core particularly when that liquid
MIGHT be as petroleum based product. According to the chart I found
all of these seven but two suffer at least .01 water absorbtion in a
24 hour period using ASTM D570 test and some range as high as 2.8,
There are two that show less than .01: those being Polyethylene and
Acetal.
Hopefully, there is a replacement for the Fisher-Price thing and
hopefully my observation on the permeability of these seven plastics
are appropos of nothing.
I realize this is all very elemental stuff for most of you but if
anyone can enlighten me and get me back on track it will be greatly
appreciated.
Today I will order Phil Barnes' CD ROM After both JK and PD (and
probably some others told me how necessary it is. Even though much
over my head I learned a great deal after I finally bored through
Koehler's GREAT 56 pages on PPMs.
Best to all,
Dale
[email protected]
103 North Sixth Avenue
Virginia, MN 55792 USA
I just called Fisher-Price to check on the availablity of their
'Rock-a-Stack' toy which includes the large blue ring that Jim
suggests for his toroidal sensor. I had not been able to find the
thing locally but considering where I live that does not mean much.
Anyway - I called and talked to a young lady in customer service who
seemed very knowledgeable and who had the information at her finger
tips. According to here that toy is NOT made anymore. It has been
replaced by TWO newer versions. One which is SOFT (presumably
spongy) for babies and a harder one for older children which is
SQUARE.
I of course, do NOT know what type of plastic the "hollow blue ring"
was made of BUT I just checked "Materials Properties" for 7 types of
plastic: Polypropylene, HDPE, LDPE, PTFE, Acetal, Nylon and
Polystyrene. All of these seven SEEM TO ME to lack one or more
properties which I would think would be necessary or at least
desirable for a liquid filled core particularly when that liquid
MIGHT be as petroleum based product. According to the chart I found
all of these seven but two suffer at least .01 water absorbtion in a
24 hour period using ASTM D570 test and some range as high as 2.8,
There are two that show less than .01: those being Polyethylene and
Acetal.
Hopefully, there is a replacement for the Fisher-Price thing and
hopefully my observation on the permeability of these seven plastics
are appropos of nothing.
I realize this is all very elemental stuff for most of you but if
anyone can enlighten me and get me back on track it will be greatly
appreciated.
Today I will order Phil Barnes' CD ROM After both JK and PD (and
probably some others told me how necessary it is. Even though much
over my head I learned a great deal after I finally bored through
Koehler's GREAT 56 pages on PPMs.
Best to all,
Dale
[email protected]
103 North Sixth Avenue
Virginia, MN 55792 USA