Fiberglass Sheet: G10 or G10/FR4?

[cruiten]

I am cross-posting this question in the hopes that more eyeballs will have a chance to see and comment...

The original post is here: https://www.rocketryforum.com/showthread.php?51647-Preparing-for-upcoming-build-Parachute-and-G10-questions

I am planning to fabricate three fins using 3/32" G10 that I am going to purchase from McMaster-Carr. I am planning on purchasing a 12"x12" sheet of "Flame-Retardant Multipurpose Garolite G10/FR4" for $12.84 (Item 8667K212) because it appears that it is both stronger and cheaper than a 12"x12" sheet of "Multipurpose Garolite G10" for $15.22 (Item 9910T81). Here is a screenshot of the mechanical and physical properties of Garolite from the McMaster-Carr website:



Am I missing something? It seems like the G10/FR4 is the item to get for my fins.

I look forward to any feedback.

Cor

 

[CarVac]

G10 is much, much less stiff than G10/FR4.

 

[cruiten]

G10 is much, much less stiff than G10/FR4.

Thanks CarVac for the quick response!

I will plan on moving forward with the G10/FR4 as the material for my fins.

I wonder if it is safe to assume that people really mean "G10/FR4" when they refer to "...a sheet of G10...", or "...a G10 tube..."

In any case, thanks for the answer!

Cor

 

[cvanc]

Interesting. What is the difference in price?

 

[cruiten]

Interesting. What is the difference in price?

At McMaster-Carr a 3/32" thick 12"x12" sheet of "Flame-Retardant Multipurpose Garolite G10/FR4" is $12.84 (Item 8667K212), while a 3/32" thick 12"x12" sheet of "Multipurpose Garolite G10" is $15.22 (Item 9910T81).

Cor

 

[CarVac]

Thanks CarVac for the quick response!

I will plan on moving forward with the G10/FR4 as the material for my fins.

I wonder if it is safe to assume that people really mean "G10/FR4" when they refer to "...a sheet of G10...", or "...a G10 tube..."

In any case, thanks for the answer!

Cor

A sheet of G10 will be actual G10/FR4, but a body tube will not be be G10 but instead convolute wrapped fiberglass in epoxy.

 

[cruiten]

Got it, that makes sense.

Thanks,

Cor