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Hi there, Does anyone have any experience with aggregates or methods of reducing the thermal conductivity of concrete? Thanks, Marc

Thanks for the information! Okay, I can totally understand that a number from thin air is plucked from thin air (based on the moulders years and years of experience), but not before you know how much it's going to cost you to do the moulding, right? It's not based purely on something arbitrary...

Thanks for your responses! Pud - so we're talking something along the lines of: part cost = (material cost + X% margin) + (machine hourly rate (dependent on various factors) + X% margin) + (setup costs (dependent on various factors) In the event that a machine is full auto would there be a...

With all due respect I think most industries would consider their 'processing costs' whether in manufacturing or otherwise to be none of the customers business. I'm not for a second trying to second guess the moulder, or haggle them on price or create any enemies - in fact we currently use a...

Thanks for your replies! My intention wasn't really to get a better idea than the moulder - just to educate myself a bit further. What I would like to know is if there is a typical way that moulders will price the part. Example: if I am quoted a unit cost of $1.00 - and I know that material...

Hi there, Can anyone shed some light on how an injection moulding company will compile a quote for a certain part? I have no experience working within and Injection Moulding Company but using some logic this is where I'm at at the moment (please correct me wherever my logic was in fact...

Thank you to all contributions to this post. As suggested early on in the thread I agree the failure was likely caused by a factor other than the concrete exerting extra lateral force on the walls, so as such will get back to redesigning thanks again

The concrete was less than 0.5m in height in the formwork when it blew, so considerably less than the 4'. I should mention that this was a test environment, not a real construction project. I'm wondering whether the rapid loading could have played a part? Is that usually considered in...

Okay that's interesting. The reason I ask is because we had a blowout on a new ICF system where the plastic ties failed. Based on pressure calculations done using pgh as the maximum pressure the ties SHOULD have taken the load, however they didn't and I attributed this to an increased pressure...

Thanks for your response hokie66. If you imagine a scenario where you have a boom pump fully extended in height - for arguments sake lets say the concrete is being pumped/ falling from 10m in height. The concrete is going into a 6" wide formwork for a wall - the impact of the concrete hitting...

Hi there, Does anyone have any advice or experience calculating the additional pressure on formwork when concrete is being pumped out of a boom pump from a great height? Thanks

Nylon was chosen for it's high strength. Given certain other factors considered we decided that a high strength material, although more costly, would be best for the design as appose to a lower strength, cheaper material that was thicker at stress concentration areas. This is the main...

If I switched to a glass filled PolyPropylene do you think I would still encounter similar issues with conditioning?

Hi there, I'm trying to calculate the force exerted on plastic ties in an ICF system. If the maximum pour height is 3m then the maximum pressure would be 2500 (density of concrete) * 9.8 * 3 (height) = 73.5KPa. The pressure will obviously highest at the bottom, therefore the tie at the bottom...

Thanks for your responses. Unfortunately I don't think the moulders will let us go there in person and play around with the tool. The point that just because it's a temporary tool doesn't mean corners can be cut is a good one. Indeed, the recommendations stipulated by the resin manufacturer...

Hi there, I recently received a batch of injection moulded parts from an aluminium prototype mould tool. The material used was Zytel 70G30HSLR. Upon receipt of the parts I noticed how brittle they were in comparison to other glass filled PA products - in particular a 50% glass filled part I...