So apparently natural rubber latex can get weaker and turn sticky over time, i.e., it doesn't age well.
Which latex substitutes age well (>30 year lifespan)? Polyurethanes? Butyl rubber?
This is for a low stress application (just used for increasing the coefficient of friction of a surface)...
I want to buy some Kevlar, Technora, Vectran, Zylon, etc. cloth (not for resin impregnation) since it could make some really strong and lightweight clothing or kites.
Why doesn't anyone make them? Is it too brittle? UV resistance? Cost? Low volume?
I'm looking for a material that melts lower than 90C but has less than 3% creep per year at 1Mpa and 45C. It should also have a tensile strength of at least 15Mpa at 40C
Does anything like that exist? I know Polycaprolactone has a very low melting point, but what about creep resistance?
Hi guys,
How do I estimate the drag of a well designed deep camber airfoil with a height to length ratio of 1/4.5 with 20% accuracy?
Lift is not important, just need to minimize air resistance
The aspect ratio would be 1/3, not sure if that matters much though
I haven't been able to figure...
I need to get a spool of a single Kevlar 49 fiber (I can use Kevlar 29 if it's my last option)
Does anyone know any suppliers? If I can't get a single Kevlar fiber on a thread, does anyone sell extremely thin threads on spools of the stuff?
Also, does anyone know where to get carbon fiber in...
Wouldn't spur gears have a tiny variation in mechanical advantage as they go through different stages in where their teeth mesh? Basically the idea is that as the teeth mesh, they have to slide just a tiny amount, probably around 1% of the tooth pitch, but that also means that both gears change...
I need something stretchy like a rubber band for holding things together, but it has to be very creep resistant because it needs to withstand a constant ~50% elongation for at least 3-5 years without significantly changing length/tension. I tried it with natural latex rubber but after only a few...
Hi,
All of you here probably know how to electrochemically deposit an oxide film a few hundred nanometers thick that can use quantum effects to make bright colors. The thickness of the film is somewhat proportional to the voltage potential.
However, is it possible to make a coating that is a...
Are blue/green/red lasers more efficient than LEDs? I have read documents stating that VCSELs (a type of vertical chip laser) convert 66% of electrical energy to light - compared to about 33% for the most efficient white LEDs. The only problem is whenever I google actual VCSELs for sale, they're...
I'm looking at the efficiencies of color LEDs and many of them have terrible efficiencies compared to the best white LEDs like the Cree XM-L which gets between 100-160 lumens per watt. I know that the eye is less sensitive to blue and red light, but even green LEDs only have a fraction of the...
Hey guys,
I tried asking google multiple times but I could never find a white or transparent dye or coating that is designed to radiate infrared light yet reflect visible light. I would also prefer to be able to integrate the coating in the anodizing in aluminum for better durability. (not sure...
I've looked everywhere and I can't seem to find any info on the tensile strength of any version of Gorilla Glass 1, 2, or 3
Normal glass seems to have a tensile strength of around 50MPa. Gorilla Glass 2 was demonstrated to be stronger and more impact resistant than aluminum, so (assuming an...
I need something that can protect clear plastic from getting scratched and has to be scratch resistant vs sharp aluminum objects (tensile strength ~ 250MPa) so it should be reasonably hard. The problem is that most transparent scratch resistant materials (like glass) are too brittle - I need...
I know this might sound like an easy question, but what's the tensile strength of Cotton, Nylon, and Polyester fibers? It's been months now and I still don't have any good data.
Also, what's the tensile strength of Technora fiber?
-Gene
I have a box of latex gloves and although their outsides are very grippy, the inside of them seem to have some sort of low-friction coating to make them much easier to put on and take off. How did they put that coating on? I think I read somewhere that adding chlorine to latex will chemically...
Hi,
I'm doing some research on whether investment casting would be a good way to reduce production costs for my company, but I want to make sure that the quality of the finished parts is top-notch.
NOTE: some of these questions are kinda noobish haha :)
How do you make sure the metal seeps...
Hey guys,
Why do we still build houses out of wood, brick, and stone? Those materials have been used for thousands of years. With modern technology, we have access to much stronger materials like fiberglass and aluminum and those materials would make a house immune to earthquakes and possibly...
Hi,
Would it be possible to add fumed silica, carbon nanotubes, chopped fiberglass strands, or carbon black to epoxy/polyurethane based paint to make them harder, stronger, and more durable?
I know that carbon black and fumed silica has made tires 10x stronger and much more abrasion resistant...
Hi,
I was wondering if fumed silica would make epoxy or polyurethane based paint harder/more durable/scratch resistant? It works on rubber tires, so why not plastic?
Also, would carbon black work for reinforcing? Or even carbon nanotubes?
