Strimmer carburetor insulator

[openBrain]

The temperature is something to think about, the data sheets talk about +80° (Celsius I guess!).

Depending on the exact flavor, the manufacturer indicates between +80 and +100 °C at permanent usage, between +100 and +120 °C at peak usage, and a fusion temperature around 135 °C. These are very acceptable performances for a plastic (IMHO).
Also the minimal usage temperature of about -80 °C and the null water absorption provide a good lasting, even for a tool that is stored on a garage or garden shed.

[chrisb]

I would guess that it will not get hotter than 100°, as I remember from the times driving a 50 ccm aircooled two stroke engine, where the temperature could be checked with a wet finger guessing the time it took to dry on a cylinder...

[r.tec]

I'd suggest using PTFE (i.e. Teflon®....)

[chrisb]

I'd suggest using PTFE (i.e. Teflon®....)

Sounds very good: Extremely resistant against allmost all chemicals, especially fuel, melting point above 300°, it is used for engine seals with very high heat exposition.
So if it ever breaks, you can go for this.

[kisolre]

PTFE - expensive, no elasticity, vibrations will loosen the screws (ptfe will be sqhashed and will not return to original shape). Just my exterience.

[openBrain]

PTFE seems also clearly over-specified to me. And despite it's definitely better regarding temperature & chemical, I'm not sure its other mechanical properties are better adapted than PEHD (but I'm not an expert).

And at the time the part was done, I had a better real life rational : when a friend of yours is machining it in one of its material scrap for free, considering the proposed material is convenient, just accept it.

[NormandC]

PEHD

I was scratching my head with this acronym until I decided to google it, then I understood: you're using the French acronym, in English (which we're used to here because our tiny French-speaking province is surrounded by English-speaking neighbours, suppliers etc.) it's called HDPE.

Getting the stuff for free is a good reason! As they say, don’t look a gift horse in the mouth.

[openBrain]

PEHD

I was scratching my head with this acronym until I decided to google it, then I understood: you're using the French acronym,

Ouch. I didn't realize because much material acronyms are english (eg. PEEK). But here as HD (High Density IIRC) is a flavor, indeed french is different from english. Do you think I should edit former posts ?
That makes me think to the UTC acronym where french & english vainely fought a long time to decide between respectively TUC and UCT, to finally choose something that as no meaning in both languages so everybody will be equal...

in English (which we're used to here because our tiny French-speaking province is surrounded by English-speaking neighbours, suppliers etc.) it's called HDPE.

Our case is slightly different from yours. Our reasonably big (compared to neighbours) French-speaking state is surrounded by Dutch, French, German, Italian & Spannish speaking people. English speakers are kept safely away by the Channel. What they don't know is that we take occasion of digging the Channel Tunnel to install a bung so we can sink their entire island if needed.

[bernd]

... the times driving a 50 ccm aircooled two stroke engine ...

which one?

[chrisb]

... the times driving a 50 ccm aircooled two stroke engine ...

which one?

Zündapp and Simson. The latter was stolen twice, and I got it back only once .