Mold release
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From: kml on 19 Jul 2007 00:11 Does any one have any empirical evidence for the existence of new tire "mold release" other than anecdotal folklore? cheers ken
From: Albrecht via MotorcycleKB.com on 19 Jul 2007 01:27 kml wrote: >Does any one have any empirical evidence for the existence of new tire >"mold release" other than anecdotal folklore? I think it was at the end of "The List of Adrian Messenger" where Kirk Douglas says, "Evil is." Yes, Ken, in spite of assertions to the contrary, tires built in the USA are sprayed with mold release compound during the build process. One Dunlop tech rep denied that Dunlop uses mold release, claiming that Dunlop motorcycle tires had shiny tread surfaces because of "highly polished molds". Maybe he was instructed to say that so there would be fewer product liability lawsuits against Dunlop? Motorcyclists worry about losing grip due to slippery mold release compounds, but the EPA is worried about Volatile Organic Compounds released by green tire spraying operations during the tire build process. The EPA has set standards for volatile organic compounds in mold release compounds of 12% VOC for sprays with organic solvents and 10% VOC for sprays with water based solvents. The EPA encourages manufacturers to use mold releases with water based solvents. Please read this document for us and find out what tire manufacturers do to remove this hazardous material from tires. http://72.14.253.104/search?q=cache:eVnIN3-aNyAJ:www.epa.gov/ttn/caaa/t3/reports/p_mact5.pdf+pirelli+%22green+tire+spraying%22&hl=en&ct=clnk&cd=1&gl=us&ie=UTF-8 -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200707/1
From: Rob Kleinschmidt on 19 Jul 2007 15:22 On Jul 18, 9:11 pm, kml <kenmaclean...(a)hotmail.com> wrote: > Does any one have any empirical evidence for the existence of new tire > "mold release" other than anecdotal folklore? Yet more anecdotal evidence: Last tire I bought, I did an accidental burnout leaving the tire place. Apparantly it was more glopped up with whatever than most new tires. Bottom line: You can assume your new tire may not have 100% of its normal traction for the first hundred miles, or assume that it's at 100% as you leave the shop. Probably prudent to assume that it's at less than 100%. Your choice.
From: The Older Gentleman on 19 Jul 2007 16:16 Rob Kleinschmidt <Rkleinsch1216128(a)aol.com> wrote: > On Jul 18, 9:11 pm, kml <kenmaclean...(a)hotmail.com> wrote: > > Does any one have any empirical evidence for the existence of new tire > > "mold release" other than anecdotal folklore? > > Yet more anecdotal evidence: > > Last tire I bought, I did an accidental burnout leaving > the tire place. Apparantly it was more glopped up with > whatever than most new tires. > > Bottom line: > > You can assume your new tire may not have 100% > of its normal traction for the first hundred miles, or > assume that it's at 100% as you leave the shop. > > Probably prudent to assume that it's at less than > 100%. Your choice. I thought everyone knew to scrub in new tyres gently before giving them full lean, as it were? -- BMW K1100LT 750SS CB400F CD250 SL125 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells.....
From: Rick Cortese on 19 Jul 2007 17:12
Rob Kleinschmidt wrote: > On Jul 18, 9:11 pm, kml <kenmaclean...(a)hotmail.com> wrote: > >>Does any one have any empirical evidence for the existence of new tire >>"mold release" other than anecdotal folklore? > > > Yet more anecdotal evidence: > > Last tire I bought, I did an accidental burnout leaving > the tire place. Apparantly it was more glopped up with > whatever than most new tires. FWIW: I did some formulation work in my career. You wouldn't believe the amount of junk added and the techniques used. Additives like like UV protectants and antioxidants are routinely used. I don't particularly subscribe to this theory, but sometimes additives are chosen such that they are incompatible and will "bloom" to the surface. I can give you a specific products where I was forced/overruled to switch from compatible plasticizer to use of an additional incompatible one because it had lower water solubility. The suit/pHd's theory was the incompatible highly water insoluble plasticizer would stick around longer then the water insoluble one and give better performance. From the testing I was able to do the theory was wrong but we got stuck with the formulation anyway and the polymer would literally sweat plasticizer. Rick |