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Discussion Starter #1
Hi guys,

I have searched for answers to this question, but didn't really get it. I am just wondering is it true that resin (bezel & straps) used on the GWF-1000 series are superior than the resin used on normal G's ?

I know the GW5000, giez 1300 and etc certainly have totally different higher quality resins on them. Is this the same case with new atomic forgies? How does the resin feel on it?

Can the forgies owners shed some light for me please? thanks a lot.
 

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I don't have my atomic frog anymore (it was too big for my liking) but I don't remember the resin feeling any different than other Frogman models or other G-shocks in general. Frogman bands are thicker than the bands of other G-shocks, but I don't think they use a different type of resin. If it is different, then it is a subtle difference.
 

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Discussion Starter #3 (Edited)
On the back of the resin band there is usually engraved information on what type of resin is used for this strap, for example, on my current daily beater GW-5600J, I read:
685 F1 16 > pur <
Googling it a litte bit reveals that it is one type of resin formula. So we know that Casio play with different resin formulas on different watches over years. Does any one have the specific information on what type of resin is used on all current g-shocks? Or maybe, we should make of list of it in this thread.

With those information, I think, we may finally
be able to decode the characteristics/properties of different types of resin used on our watch bezel/bands, after some help from chemists ( yeah, I am thinking of Sjors here, who is supposed to know most about g's :)

Of course, it will then be self-evident whether frogman pocess superior resins :)

 

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Frogman

GW-204K is 431 F3 18
GW-200MS is 431 F4 18
DW-9902 is 500 F1 16
GW-200K is 431 F3 18
GW-206K is 431 F3 18
GW-225A is 431 F3 18

Gulfman

GW-9100K is 470 P1 16
GW-9100 is 470 P1 16
GW-9110K is 470 P1 16
G-9101K is 470 P1 16


Fisherman

DW-8600 is 449 P1 16


5600

GW-S5600 (carbon fiber and resin) is 771 Y1 16

Riseman

GW-9200KJ (pink riseman) is 755 EJ2

Other

DW-9700K is 470 P1 16
DW-9701K is 470 P1 16
DW-6900K (25th anniversary commemorative reissue) is 413 F2
DW-9600WC is 475 H3 21
DW-6900KR is 413 P12 16
GD-100PS is 776 EJ6 16

Let's get to the bottom of this...

by the way, a lot of watches have the middle number change depending on which side of the strap it is. for example, on a frogman, the long side of the strap is a F3 and the buckle side is an F4. On the GW-200MS, however, both sides are F4
 

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I'll try to contribute with my small collection of Casio watches:

G-7900-3 is 772 FBI 16
GA-100-1A4 is 780 P21 16
GX-56-1A is 786 FY11 16
ProTrek PRG-130Y is 752 EJ2

All of them have >PUR< at the bottom of the codes. I guess the PUR part denotes Polyurethane Resin? And the '16' is probably the lug width?
 

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Casio Illuminator : 746FW218 >PUR<
Casio G-shock GW9200 : 755EJ2 >PUR<

The bezel seems to be much harder than the band so they may be made with different formula (not pure resin).
 

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Discussion Starter #9 (Edited)
Hi guys, sorry for the late follow up for this thread I started, currently I am still out of town traveling, finally got some time this evening to go on Internet, phew ...

OK here is my findings,
"PU" should mean "Polyurethane". For the 3 digits, the first is the SPI resin identification coding system, and second is the product type, and third digit is color information. Take a look at this PDF file about plastic/resin recycling at Page 22:
RECYCLING 101 SERIES: Recycled Plastic Scrap
plastic-grade-system.jpg
Google it, you will find more interesting information, for example:
here and here

So what we learn? First of all, the first digit
"4" means LDPE (Low-density polyethylene), which is what Casio use for older generation g-shocks. Google the Low density polyethylene, you will find descriptions of its properties, for example, on wiki it reads:
Properties

LDPE is defined by a density range of 0.910–0.940 g/cm³. It is not reactive at room temperatures, except by strong oxidizing agents, and some solvents cause swelling. It can withstand temperatures of 80 °C continuously and 95 °C for a short time. Made in translucent or opaque variations, it is quite flexible, and tough but breakable.[citation needed]
LDPE has more branching (on about 2% of the carbon atoms) than HDPE, so its intermolecular forces (instantaneous-dipole induced-dipole attraction) are weaker, its tensile strength is lower, and its resilience is higher. Also, since its molecules are less tightly packed and less crystalline because of the side branches, its density is lower. LDPE contains the chemical elements carbon and hydrogen.
Chemical resistance


while digit "7" is a new type of resin that was used for newer watches like the 7900, GX56, new frogies and so on, but since it is categorized as "others", we need more information to further decode what it is and correspondingly its characteristics. so if we assume that "7" is an improvement from LDPE (type 4), then if the older g-shock resins survive 10 years, one may think the new type-7 resin should do better. Unfortunately, we will need to wait a couple of years, or worse 20 years, to verify that.

Oh by the way, what do you think the last letter "R" after "PU" stand for? :think:
 

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I think the R just stands for resin....

This info should be useful in knowing what chemicals NOT to use on the resin for preservation purposes.
 
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