Is MDF porous?

[xtremekustomz]

I created this video at work of our CNC router table. It has a vacuum connected to it and a piece of 1/2" mdf is laid on top. When the video starts the vacuum is off and the paper glides across freely. The vacuum is then turned on and it creates a suction THROUGH the mdf and makes the paper stop.

video0003 - YouTube

[Random1010]

Ok.

[NASTY08IMPALA]

exactly why i dont like raw mdf boxes .leakkkkss

[TheUnderFighter]

We know dis.... That's why people are supposed to coat their speaker baffles in resin. Also, most boxes are done with 3/4" MDF, I wonder if that would make a difference?

[xtremekustomz]

I'm going to take a 3/4" piece to work and see what it does. I was surprised it is able to create that much suction. I knew it was porous but not to the point of what it is. I'm not saying that most of you guys didn't know this. I know people have questioned the porosity of MDF and figured this was a good answer to the question.

[TheUnderFighter]

I'm going to take a 3/4" piece to work and see what it does. I was surprised it is able to create that much suction. I knew it was porous but not to the point of what it is. I'm not saying that most of you guys didn't know this. I know people have questioned the porosity of MDF and figured this was a good answer to the question.

Yea, I'll definitely agree, I didn't think it was THAT porous... that is impressive. Was it a super vacuum? haha

[xtremekustomz]

You can see the vacuum near the end of the video on the floor. It's pretty large. Not sure of the hp rating on it but it is 3 phase.

[nu2spl]

We know dis.... That's why people are supposed to coat their speaker baffles in resin. Also, most boxes are done with 3/4" MDF, I wonder if that would make a difference?

exactly....resin is ALWAYS a good idea,i never build a box without resin no matter what materials i use