box made of polypropylene

[97gmcsierra 10+ year member]

How about that rubberized undercoating nice and thick on MDF? Wouldn't you think it to be waterproof since it is used to spray under vehicles and stuff? Or some kind of bed liner?

 

[Immacomputer 10+ year member]

or, i suppose, there are better ways to weatherproof a box made of mdf

Add a couple coats of polyurethane with the end grain of wood sealed and you will be fine.

 

[helotaxi 5,000+ posts]

My subs have polypropylene cones:fyi:..... They dont flex...//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

The cone shape is what gives them rigidity. Lots of subs have paper cones, doesn't make it suitable for sub enclosures.

For a waterproof box, make it out of MDF and cover it in fiberglass resin. Downfire the sub to keep it dry.

 

[97gmcsierra 10+ year member]

The cone shape is what gives them rigidity. Lots of subs have paper cones, doesn't make it suitable for sub enclosures.

I know. just messin. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

He could get a marine sub that is somewhat "weatherproof".

 

[ramos 5,000+ posts]

The cone shape is what gives them rigidity. Lots of subs have paper cones, doesn't make it suitable for sub enclosures.
For a waterproof box, make it out of MDF and cover it in fiberglass resin. Downfire the sub to keep it dry.

winner winner chicken dinner , easiest way I know to do it. I also do this with every baffle I put in a car door. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[luvinthebass 5,000+ posts]

The polypropylene box would have to be hella thick then.

 

[iamamp3pimp 5,000+ posts]

the whole idea of using polypropylene was to make an weather prof box and put it in a jeep.

fiberglass resin will do that for you.

 

[iamamp3pimp 5,000+ posts]

The cone shape is what gives them rigidity. Lots of subs have paper cones, doesn't make it suitable for sub enclosures.
For a waterproof box, make it out of MDF and cover it in fiberglass resin. Downfire the sub to keep it dry.

or 6th order...

 

[Chevyaudio 5,000+ posts]

Spray-on bedliner also works very well if applied correctly (and im not talking about the rattle can you buy from walmart)

 

[Immacomputer 10+ year member]

winner winner chicken dinner , easiest way I know to do it. I also do this with every baffle I put in a car door. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Polyurethane is cheaper and easier to apply!

 

[bumpin buick 5,000+ posts]

Im currently at work, at a company called Alcan Packaging, we work primarily with polymers. I am cheimical engineer intern here. I asked one of the engineers thats been here for a long time, They said a polypropylene composite should work great. I think he's referring to like the stuff they use on decks now, its expensive but very sturdy and easy to work with.

 

[Immacomputer 10+ year member]

My uncle builds fire truck tanks out of polypropylene and I've seen some enclosures that some of the employees have made from scratch and they're not very sturdy at all. They can easily flex by pushing on them. I also have a few storage containers around here and they're not sturdy either. Anybody who says they would work great probably doesn't understand enclosure construction or design very well.

 

[dcole18 5,000+ posts]

My uncle builds fire truck tanks out of polypropylene and I've seen some enclosures that some of the employees have made from scratch and they're not very sturdy at all. They can easily flex by pushing on them. I also have a few storage containers around here and they're not sturdy either. Anybody who says they would work great probably doesn't understand enclosure construction or design very well.

he's talking about the composites, that look like wood... they make decks out of the stuff..

if you could get a sheet of the stuff i dont see why that wouldnt work

 

[azbass 5,000+ posts]

the whole idea of using polypropylene was to make an weather prof box and put it in a jeep.

a normal mdf box covered in bed liner. done.

 

[bumpin buick 5,000+ posts]

he's talking about the composites, that look like wood... they make decks out of the stuff..
if you could get a sheet of the stuff i dont see why that wouldnt work

The only problem is Ive never seen them sold in sheets, they always sell them in planks like 1"x4" or something. I have no reason to doubt a composite would work well and there much more forgiving when you over tighten they dont crack instantly.