Please help. Resin to brittle.

[TK7903]

Hi Guys,

Firstly, thanks for all your advice from a couple of weeks ago.
With it Ive managed to make my first mould in RTV silicone.

I have a problem though......

I'm using Polyurethane fast cast. a part A and part B.

Ive also got some coated calcium carbonate BLR2 filler.

The shape that I'm making needs to withstand being dropped from waist height.

But it just shatters into 4 pieces when dropped.

I want it strong but not brittle.

Can anyone help with mixture quantities or something???

The walls are approx 5mm thick.

Many thanks in advance.

 

[clonesix]

Fast Cast? Is that the Tap house brand?

You could try a more impact resistant resin, or adding reinforcement to the casting. You can reinforce with fiberglass or nylon strip.

 

[TK7903]

Thanks clonesix,

Not sure if its a Tap house brand. Its from a guy here in the UK.

Reinforcement to the casting is a cool idea,
although I can still see it chipping or breaking parts of the cast when dropped. :cry

Ive emailed the guy to see if he does a more impact resistant resin.

 

[minieffects]

Sounds like its either not designed for your specific application or its just not very good. I cant really recommend anything it the uk as I dont live there. But I can direct you to companies in the us that make really good impact resistant resins. basically you want somthing with a 75d to 80d shore hardness and has thermoplastic properties.

smooth on products www.smoothon.com
smoothcast

silpack www.silpak.com
Silwhite

bjb enterprises www.bjbenterprises.com
tc-808

ptm&w www.ptm-w.com

minieffects

 

[clonesix]

I didn't realize you were in the UK. TAP is my local expensive plastics chain that I refer to.

If you have a supplier there, then perhaps you could request a batch of cured samples of their resins.

 

[minieffects]

<div class='quotetop'>QUOTE(clonesix @ Dec 17 2006, 11:20 PM) [snapback]1380210[/snapback]</div>

I didn't realize you were in the UK. TAP is my local expensive plastics chain that I refer to.

If you have a supplier there, then perhaps you could request a batch of cured samples of their resins.

[/b]

allways the best bet. You can then do tests on the material. I have also found that by talking to the rep for the company that they can direct you to the best material for the application. If you tell then how you are using the material and what properties you are looking for they will direct you to the best product in their line.


good luck


minieffects

 

[TK7903]

Thanks guys,

Thermoplastic properties, sounds about right.

Seems like I have bought the wrong resin for my application then?

I will do some research into the products your suggesting, and see if there here in the UK.

So annoying that Ive got so far then hit a dead end. :cry