Blue/Gray Silicone CV Boots

[Ken H.]

I haven't done the detailed analysis yet, but this looks too good to ignore:

https://www.ebay.com/itm/Universal-High-Quality-Blue-Silicone-CV-Joint-Boot-Drive-Shaft-sk02a/322041037715?_trksid=p2485497.m4902.l9144

Ken H.

 

[john r. lebetski]

You will have to test as silicone tears very easily and the tear propagates very quickly. Looks like something for the tuner kids.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Ken H.]

I never used the old "famous" blue silicone boots that were so popular with
GMCers before they became unavailable. Were they also easily torn with
fast propagation? If so, why were they so popular?

Ken "Merely Curious" H.

On Tue, Aug 21, 2018 at 9:54 AM John R. Lebetski
wrote:

> You will have to test as silicone tears very easily and the tear
> propagates very quickly. Looks like something for the tuner kids.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>

 

[john r. lebetski]

Ken I don't know about the old ones but they were probably a blended material. Some EPDM percentage. I learned a little about it when we had custom
plug wire boots made.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Tom Newell]

Curiosity got the best of me, so off to Wikipedia.

First, and embarrassingly for me, silicone, the rubber, is not the same word as silicon, the second most abundant element in the earth's crust. Over
55 years to notice that... Silicone does contain silicon (SI), for what that is worth...

So, from Wikipedia for silicone rubber:

"Silicone rubber offers good resistance to extreme temperatures, being able to operate normally from −100 to 300 °C (−148 to 572 °F). Some
properties such as elongation, creep, cyclic flexing, tear strength, compression set, dielectric strength (at high voltage), thermal conductivity,
fire resistance and in some cases tensile strength can be--at extreme temperatures--far superior to organic rubbers in general, although a few of
these properties are still lower than for some specialty materials. Silicone rubber is a material of choice in industry when retention of initial
shape and mechanical strength are desired under heavy thermal stress or sub-zero temperatures..."

Further from Wikipedia:

"There are many special grades and forms of silicone rubber, including: steam resistant, metal detectable, high tear strength, extreme high
temperature, extreme low temperature, electrically conductive, chemical/oil/acid/gas resistant, low smoke emitting, and flame-retardant. A variety of
fillers can be used in silicone rubber, although most are non-reinforcing and lower the tensile strength...."

So, in a nutshell, they can make what is known generically as "silicone" with a wide variety of desired properties. Maybe even a "boot" variety.
Science is fun...

Tom Newell
San Pedro, California

 

[robert mueller]

Ken,

Back in 2008 when I was working on Double Trouble at the COOP I was rummaging around JimB's used CV joint spares when I happened on two used blue
boots. I asked Jim if he would sell them to me and he said "just take them." The have been installed on for 10 years now and they're just fine. I
reckon I've put around 60,000 miles on the but have no idea how many miles were on them when Jim gave them to me..

Emery sold me a new one and I came up with another new one from somebody and they're on The Blue Streak in Sydney. Then I got REALLY lucky and Mike
Beaton sold me a pair that he didn't need as the ones he had on his GMC were fine. They are in Australia.

Last year I got a pair of grey silicone boots from Jeff Sirum and put them on the Kingsley, they were a bit finicky to install but I'd say they'll be
OK. They are not as thick as the blue boots.
--
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426

 

[cesar carrasco]

Are the blue boots the two piece?

On Tue, Aug 21, 2018 at 8:27 PM Robert Mueller
wrote:

> Ken,
>
> Back in 2008 when I was working on Double Trouble at the COOP I was
> rummaging around JimB's used CV joint spares when I happened on two used
> blue
> boots. I asked Jim if he would sell them to me and he said "just take
> them." The have been installed on for 10 years now and they're just fine. I
> reckon I've put around 60,000 miles on the but have no idea how many miles
> were on them when Jim gave them to me..
>
> Emery sold me a new one and I came up with another new one from somebody
> and they're on The Blue Streak in Sydney. Then I got REALLY lucky and Mike
> Beaton sold me a pair that he didn't need as the ones he had on his GMC
> were fine. They are in Australia.
>
> Last year I got a pair of grey silicone boots from Jeff Sirum and put them
> on the Kingsley, they were a bit finicky to install but I'd say they'll be
> OK. They are not as thick as the blue boots.
> --
> Regards,
> Rob M. (USAussie)
> The Pedantic Mechanic
> Sydney, Australia
> '75 Avion - AUS - The Blue Streak TZE365V100428
> '75 Avion - USA - Double Trouble TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[steve southworth]

> Are the blue boots the two piece?

No. Blue boots are one piece.

--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

 

[richard h staples]

FWIW,
I don't usually post my bargain finds here, not wanting to undercut our GMC suppliers who need to make a living so they can keep our coaches living.
However.... Before you go buying a Universal Fitzall CV boot, go to Rock Auto, and do a search by part number for Moog 2456 CV boot kit. This is an
exact replacement for our Toronado/GMC outer CV boots. Just like original, and easier to install than the universal type, they include grease and new
circlip, all for about $12 plus shipping.
JWID
Rick Staples
--
Rick Staples, '75 Eleganza, Johnstown, CO

"Advice is a dangerous gift, even from the Wise to the Wise, and all paths may run ill." -Tolkien

 

[emerystora]

HOWEVER — THIS IS NOT A SILICONE BOOT. The site says this is a neoprene rubber boot.

The blue ones that Rob Mueller mentions are silicone.

Emery Stora
77 Kingsley
Frederick, CO

>
> FWIW,
> I don't usually post my bargain finds here, not wanting to undercut our GMC suppliers who need to make a living so they can keep our coaches living.
> However.... Before you go buying a Universal Fitzall CV boot, go to Rock Auto, and do a search by part number for Moog 2456 CV boot kit. This is an
> exact replacement for our Toronado/GMC outer CV boots. Just like original, and easier to install than the universal type, they include grease and new
> circlip, all for about $12 plus shipping.
> JWID
> Rick Staples
> --
> Rick Staples, '75 Eleganza, Johnstown, CO
>
> "Advice is a dangerous gift, even from the Wise to the Wise, and all paths may run ill." -Tolkien
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Keith V]

Tom Newel said
>First, and embarrassingly for me, silicone, the rubber, is not the same word as silicon, the second most abundant element in the earth's crust. Over
>55 years to notice that... Silicone does contain silicon (SI), for what that is worth...

True that Silicone is not the same as Silicon, false that silicone does not contain Silicon.

Silicone is the 'organic' form of silicon. [R2SiO]n, where R is an organic group...
Silicon is a metal ( well sort of ), SiO2 is silicon dioxide AKA Quartz, quarts is the major component of glass.

Silicone is to silicon as Latex is to carbon

________________________________
From: Gmclist on behalf of Tom Newell via Gmclist
Sent: Tuesday, August 21, 2018 2:15 PM
To: gmclist
Cc: Tom Newell
Subject: Re: [GMCnet] Blue/Gray Silicone CV Boots

Curiosity got the best of me, so off to Wikipedia.

First, and embarrassingly for me, silicone, the rubber, is not the same word as silicon, the second most abundant element in the earth's crust. Over
55 years to notice that... Silicone does contain silicon (SI), for what that is worth...

So, from Wikipedia for silicone rubber:

"Silicone rubber offers good resistance to extreme temperatures, being able to operate normally from −100 to 300 °C (−148 to 572 °F). Some
properties such as elongation, creep, cyclic flexing, tear strength, compression set, dielectric strength (at high voltage), thermal conductivity,
fire resistance and in some cases tensile strength can be--at extreme temperatures--far superior to organic rubbers in general, although a few of
these properties are still lower than for some specialty materials. Silicone rubber is a material of choice in industry when retention of initial
shape and mechanical strength are desired under heavy thermal stress or sub-zero temperatures..."

Further from Wikipedia:

"There are many special grades and forms of silicone rubber, including: steam resistant, metal detectable, high tear strength, extreme high
temperature, extreme low temperature, electrically conductive, chemical/oil/acid/gas resistant, low smoke emitting, and flame-retardant. A variety of
fillers can be used in silicone rubber, although most are non-reinforcing and lower the tensile strength...."

So, in a nutshell, they can make what is known generically as "silicone" with a wide variety of desired properties. Maybe even a "boot" variety.
Science is fun...

Tom Newell
San Pedro, California

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[Tom Newell]

Agreed. What I attempted to convey; poorly it seems.

On the subject, here is a really interesting, recent article on high purity silicon in North Carolina, the changing value of commodities, the rise of
automation, and the market for sand. And it has pictures of pure silicon.

https://www.wired.com/story/book-excerpt-science-of-ultra-pure-silicon/

Tom Newell
San Pedro, California