I have worked for a client to modify their plastic snap geometry with the intent to reduce a "soft" click. They desired for a more crisp audible sound and strong tactile feedback. Unfortunately, there are too many variables in play to predict this behavior or prescribe a method to you. We...
Some companies/industries have standard supplier questionnaires because they require suppliers to become approved and be added to a formal company list. In my experience they ask a lot of basic questions but by going through the process the answer becomes clear.
Some questions I've seen...
I have qualified a molded medical component after a tooling modification through a DOE. Our application only required OQ/PQ. We monitored mold time, pressure, and temperature.
300+ Components were split into two OQ runs; min and max. The goal of the OQ is to verify that the boundary conditions...
I agree that metal is not the ideal choice for a driver (usually a hard metal). I would guess the corners you machine will round over very quickly. However, I can conceive of a number of scenarios where plastic could be appropriate based on torque, cost, number of uses, use enviroment etc...
I have a group of tungsten pins used in an application like a single cathode. They are 2% lanthanum doped. We have noticed that when an arc is generated in our product the cathodes tend to warp. This is causing instability. We believe this warping to be due relief of stress due to material...
Does anyone own this or have experience with it? There are only two reviews and I'm curious if anyone would recommend it.
Seals And Sealing Handbook by Robert K Flitney 5 ED
http://www.amazon.com/Seals-Sealing-Handbook-Fifth-Edition/dp/1856174611/ref=sr_1_7?s=books&ie=UTF8&qid=1334696853&sr=1-7...
I am searching for a polypropylene resin grade that I may spec for an injection molded part. The criteria are that it is a preapproved FDA compliant plastic and that the material blocks at least 90% of transmission of UV light. What I'm struggling with is how to spec this second characteristic...
2 questions
1. Anyone have recommendations on a UV blocking PP that is FDA compliant (injection moldable)?
2. If I wanted to spec a resin that blocks 90% of UV light from passing through how would I do so? Is there an ASTM spec? As I understand ASTM D1003 Haze isn't the right thing.
Zytel ST801 is a strong candidate, or it's BASF equivalent (maybe Ultramid A3Z HP).
Further discussion with some tech reps has led me to be more comfortable using unfilled nylon 6/6 at these temperatures. The rep cited some GM applications as well as military.
Thanks for the responses. I typically use Matweb for my material research. Is there a better source that specifically lists cold weather resins, for my comparisons? I've noticed that a typical characteristic listed is max temp, indicating the higher limit. I've been using Izod low temp (-40) to...
I'm looking for recommendations on plastics suitable for function at a temperature range down to -40C. This will essentially be a block, its sole functional requirement will be a compressive load, so I need something that doesn't become brittle at -40C. The resin must be injection moldable. I'm...
