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Author Topic: MDF or Ply........ Foamex sheet?!  (Read 20452 times)

U-33

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Re: MDF or Ply........ Foamex sheet?
« Reply #25 on: March 26, 2015, 04:43:11 pm »

I very nearly bought one a while back, but then the Motorflote turned up.
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Rich

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Re: MDF or Ply........ Foamex sheet?
« Reply #26 on: March 26, 2015, 04:49:49 pm »

Angles on a motorflote easier than curves on a swordsman Rich {:-{

Ned
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Re: MDF or Ply........ Foamex sheet?
« Reply #27 on: March 26, 2015, 05:25:10 pm »

Speedline ?  any connection to Beeline that was ? They made little foamie bipes, Pups and Triplanes.
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U-33

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Re: MDF or Ply........ Foamex sheet?
« Reply #28 on: March 26, 2015, 05:43:09 pm »

Angles on a motorflote easier than curves on a swordsman Rich {:-{

Ned


Very true Ned...I ain't daft!
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Re: MDF or Ply........ Foamex sheet?
« Reply #29 on: March 26, 2015, 05:57:34 pm »

If anyone had been looking on the Luton stand at Warwick and alley pally for the last 3 years you would have seen an unpainted MTB made totally out of foameX. Indeed at Wicksteed last year I gave a bundles of it to several people. Curves can be held by twisting foamex to the rough shape and immersing it in hot water then pinning to the frames with plumbers plaice gel glue.
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Re: MDF or Ply........ Foamex sheet?!
« Reply #30 on: March 27, 2015, 03:10:06 pm »

This one?
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Klunk

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Re: MDF or Ply........ Foamex sheet?!
« Reply #31 on: March 27, 2015, 03:34:03 pm »

That's the one
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Re: MDF or Ply........ Foamex sheet?!
« Reply #32 on: March 27, 2015, 05:05:45 pm »

The MTB is awesome. I think i might be tempted to use this material for a future build. I was just Googling to find out a bit more about the stuff, and found this description:
What is Foamex?
Foamex is a superior quality, extremely versatile PVC foam sheet that is fabrication friendly.  It is easy to bend, cut, drill and glue and you can print on it.
What is it used for?
Foamex is mainly used to make signage, banners and exhibition display panels.   It has a fine cell structure that makes it the preferred choice for professional digital printers, and comes in a variety of colours and specifications. You can achieve high quality, visually pleasing signage and display products which look far more expensive than they actually are.
What are its advantages?
Foamex is manufactured with a high quality smooth finish that can be fabricated or cut to shape, allowing designers to create attractive graphic panels for exhibitions or advertising applications. It is a cost effective alternative to more expensive options such as plywood, MDF or aluminium, and extremely durable.
Can I use it outside?
Yes, Foamex is Water Repellent / weatherproof and does not ingress moisture so it is ideal for external applications.  It is warranted against UV fading for up to 7 years outdoors and 10 years indoors.
Is it easy to hang / mount?
As a strong, rigid material, it is easy to hang using self tapping screws, double sided Velcro or double sided adhesive pads.  Mounting on Foamex will give you excellent dimensional stability and it may be reused a number of times.

Jherek

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Re: MDF or Ply........ Foamex sheet?!
« Reply #33 on: March 28, 2015, 07:26:54 am »

I have a project (in my head) that I haven't started yet. Inspired by Ron Rees's articles in Model Boats magazine, I'd like to build one of the older Vic Smeed designs out of depron foam and possibly reinforce with carbon tubing.

As far as I can tell, depron foam is Extruded Polystyrene Foam.

Is foamex the same stuff, does anyone know the difference?
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Re: MDF or Ply........ Foamex sheet?!
« Reply #34 on: March 28, 2015, 08:10:50 am »

Foamex is a sheet material made of a sandwich of 2 PVC sheets with foam between. It is not just a sheet of foam.
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grendel

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Re: MDF or Ply........ Foamex sheet?!
« Reply #35 on: March 28, 2015, 08:35:40 am »

I used to use it at work, to make permanent signs for substations, we had a vinyl tape printer that made self adhesive signs that were then stuck to the foamex, they were good for permanent outside use, I have used scraps for several projects, it glues well with plastic solvent glue (I have a bottle left over from years back for making airfix kits) we used to use the 3mm thickness.
Grendel
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Re: MDF or Ply........ Foamex sheet?!
« Reply #36 on: April 03, 2015, 01:52:56 pm »


We need a Foamex build log on Mayhem!   O0
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Klunk

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Re: MDF or Ply........ Foamex sheet?!
« Reply #37 on: April 03, 2015, 10:42:25 pm »

Foamex is a sheet material made of a sandwich of 2 PVC sheets with foam between. It is not just a sheet of foam.

Foamex is a foam board is paper or card faced foam. Easy to cut lightweight but not waterproof or uv stable. You would need to be careful which glue to use as the foam is liable to melt.

foamex is a sheet of lightweight pvc. Uv stable waterproof and easy cut. It can be glued with most glues although I have found poly pipe gel is best. Superglue is also very good. Epoxy is a no no As it will not stick to pvc
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Klunk

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Re: MDF or Ply........ Foamex sheet?!
« Reply #38 on: April 03, 2015, 10:44:00 pm »

For free foamex find a local sign writer and ask if they have a bin of off cuts. They maybe weird sizes but it's normally free.
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captain ron

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Re: MDF or Ply........ Foamex sheet?!
« Reply #39 on: May 02, 2015, 03:50:51 pm »

Reading this posting has just reminded of a sample of MDF I got from one of our panel product reps last year.

He told me its waterproof MDF. Not moisture resistant (MR) MDF. When I got home I placed it in a bucket outside and monitored over a month. There was no dimensional change to the sample. It was still the same size. Still the same smoothness.

Its classed as dimensional stable, extreme durable, paintable and comes with for 50 year guarantee.
Avail in the usual 4,6,9,12,15,18mm 2440 x 1220mm sheet sizes.

I'm working on the rep to get me a 4mm largish sample to muck about with. Results could be interesting.

For more info check out their web site   meditetricoya.com   

captain ron 
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Klunk

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Re: MDF or Ply........ Foamex sheet?!
« Reply #40 on: May 02, 2015, 04:14:56 pm »

Mdf. Careful of the  dust
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barriew

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Re: MDF or Ply........ Foamex sheet?
« Reply #41 on: May 02, 2015, 04:39:22 pm »

Yeah
Speedline methinks
Ned


The Speedline model is not Foamex - its vacformed ABS with ply . The one on eBay is Depron and made by, I think, Aquatur.


Barrie
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Netleyned

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Re: MDF or Ply........ Foamex sheet?!
« Reply #42 on: May 02, 2015, 04:41:43 pm »

Foamex is a foam board is paper or card faced foam. Easy to cut lightweight but not waterproof or uv stable. You would need to be careful which glue to use as the foam is liable to melt.

foamex is a sheet of lightweight pvc. Uv stable waterproof and easy cut. It can be glued with most glues although I have found poly pipe gel is best. Superglue is also very good. Epoxy is a no no As it will not stick to pvc


Should the first product be Depron?


Ned
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barriew

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Re: MDF or Ply........ Foamex sheet?!
« Reply #43 on: May 02, 2015, 06:39:25 pm »

Should the first product be Depron?
Ned


Depron doesn't have anything as a cover - not paper or PVC - its just expanded plastic for want of a better description.


Barrie
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danielcardona

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Re: MDF or Ply........ Foamex sheet?!
« Reply #44 on: September 13, 2016, 12:54:54 pm »

Foamex is a foam board is paper or card faced foam. Easy to cut lightweight but not waterproof or uv stable. You would need to be careful which glue to use as the foam is liable to melt.

foamex is a sheet of lightweight pvc. Uv stable waterproof and easy cut. It can be glued with most glues although I have found poly pipe gel is best. Superglue is also very good. Epoxy is a no no As it will not stick to pvc


Ermm...so it's water proof or not?
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Martin (Admin)

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Re: MDF or Ply........ Foamex sheet?!
« Reply #45 on: September 13, 2016, 01:47:11 pm »


Is what waterproof?


.... is that bad English?!  {:-{
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Re: MDF or Ply........ Foamex sheet?!
« Reply #46 on: September 13, 2016, 02:05:34 pm »

The PVC stuff is waterproof & UV stable for exterior use - glue with polypipe. I only use this type for boats or modelling - it's great.

The Card-Faced stuff is for interior use - normally backing for posters or photography mountings - glue with pva or any paprer glues. good for modelling but I wouldn't use it to make a boat - too many sealing problems.

Other people's opinions may differ - depending on their preferences or skills.

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danielcardona

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Re: MDF or Ply........ Foamex sheet?!
« Reply #47 on: September 13, 2016, 07:48:27 pm »


Is what waterproof?


.... is that really bad English?!  {:-{


I got confused because he mentioned the world foamex in both description, sorry I didn't meant to bother anyone. It's my english that get's confused and bad.
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Re: MDF or Ply........ Foamex sheet?!
« Reply #48 on: September 13, 2016, 09:36:01 pm »


No problem.   :-)

 All OK?
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Ron Rees

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Re: MDF or Ply........ Foamex sheet?!
« Reply #49 on: September 13, 2016, 10:40:17 pm »

Hi All,


Yes...it's me, the one who builds all those Depron models in MB magazine. I was a woodwork teacher! and love wood (but MDF is not wood, its a recycled paper product shredded to dust, mixed with a binder then rolled out into a gel like sheet and baked. Unless it has a Urea Formaldehyde binder it is not waterproof and will absorb water at a prodigious rate. According to Design and Technology H & S guidelines it is really not recommended for teaching children woodwork in schools as it is regarded as a carcinogen)


I have used Depron foam for 3 years or so, along with other foams in my several model articles, the ones that are covered in ladies tights (don't tell the wife!)...Depron is an expanded Polystyrene board and often used to build lightweight model planes. It should not be glued with pipe adhesive or any of the plastic solvent or impact type. There are glues for it including Foam Safe cyanos, Deluxe Materials Canopy or R/C modellers glue. Hobbyking do a 'Foam Glue for it which is messy, epoxy works well and some Aliphatic resins.


I have also used Foamex which is great in the thicker sizes. Depron is easily available in 2,3,4,5,6,9mm thicknesses, it has no grain pattern so parts can be cut in any direction. It is particularly good for children, no smell, no dust, easy to cut, dimensionally strong, impact resistant (up to a point) Totally water resistant, UV resistant, cheaper than plywood and Plasticard.


A lamination of 3mm Depron with an applied skin of nylon, tissue, fibreglass etc and coated in epoxy resin or Acrylic varnishes is very similar to the skins now used on lightweight full size home build aircraft, with an aluminium skin it is often used in commercial aircraft, full sized boats, some body and surfboards and many other modern products.


It is not the be all and end all of building materials, but it is quick and easy to use, where it is more appropriate, of course I would use plywood etc......Its all Horses for Courses.


Cheers............Ron.
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