What is aerospace quality carbon?

[tpita]

Some places refer to their carbon as aero / aerospace quality carbon.

Yet other vendors differentiate between their own carbon as regular (implicit) and aero carbon, but the description is identical.

For instance:
Carbon fabric 204 g/m² (Aero) - Twill weave, width 100 cm
“Application: Supporting parts in aircraft construction, motor sports, ship construction and modelling, carbon design. Material as per aircraft standards”

vs

Carbon fabric 210 g/m² - Twill weave, width 100 cm, slippage-resistant,
“Application: Supporting parts in model and aircraft construction, motor sports, boat building, and design of sports
equipment; carbon designs in automotive engineering. This fabric is based on the 204 g/m² carbon fabric approved for aviation. The fabric used is made of a yarn certificated for aviation and used in diverse structural components of the Airbus.”

The prices are nearly identical. No further material properties are given.

That specific example is from the R & G Faserverbundwerkstoffe Composite Technology 2010 catalogue (http://www.r-g.de/en/), but I’ve seen it in plenty of other places as well.

What is the difference?

[riff42]

I believe the higher the modulus, the more that is used in aircraft and space applications. Something like T700-T800 (IM 7 IM8), along with the high and Ultra High. Where as standard modulus might not be used for structure applications. In VERY critical applications, they might use more pure carbon fiber (graphite I think?)
Don’t forget about marketing…saying that their fiber is “aerospace quality” is another way for people to say “woooooo, i want THAT”