I have an animation of a wine glass breaking. I simulated it using mass FX and particle flow. I will import it to After Effects, add finishing touches and render out a super slow mo clip like you would see on Discovery HD or Time Warp. In essence, I want it to look like it was shot on a high speed camera.

I tried a test render out of max at 960 fps and importing into AE at 25fps but the results aren’t quite white I want.

My question is, what frame rate do I render the animation out inside 3ds max and what frame rate do I import/interpret it in After Effects?

My question is, what frame rate do I render the animation out inside 3ds max and what frame rate do I import/interpret it in After Effects?

The correct frame rate in AE depends on your intended output format. 25 fps is correct for the PAL (or Secam) TV standard, 30 fps for NTSC, these are standard frame rates for video.
The frame rate to use in Max to get the slow-mo effect can be anything you want, depending on how slow you need it, it’s up to you.
It’s probably best to work on multiples of the final frame rate. For example if working in PAL (25fps) use 50fps for half speed, 100fps for quarter speed etc…
This is something best decided at the beginning of the project, setting the frame rate before running the simulation and creating animation. But you can use the re-scale time function to alter it afterwards, but with MassFX you may have to watch the key interpolation when extending the anim to more frames, that’s why it’s best to set the frame rate first.