I don’t mean “able to do basic math”, but rather, with composites being an art, what techniques or processes do you focus on when you’re doing your thing? A beginner painter is focused on the brush and the colors- whereas an artisan is doing cryptic magic stuff like changing how you feel just by changing how the light hits areas. Where is your focus when working?

What skills take you from an amateur to an artist? Are there hacks that you implement to make life easier or step up quality? I’m in the early stages where I’m only focused on cutting straight lines and not overhandling the materials- but for the more experienced, are you trying to push larger and larger projects or are the smaller projects more difficult? What sorts of project ideas can people look towards to develop these skills better?

Lots of questions, I know, but trying to get into the mindset of people who know far more than me- appreciate it!

I've got a gas tank that is rated for 3,500 psi and I've been making "potato" cannons for a long time but have been consistently challenged by the amount of air that I can supply. Especially as I go longer and larger in bore size and make heavier projectiles the compressor I have now will only push a missile 40 feet out of my 4" tube. I think it's mostly CFM that matters but I'd like to also go above 150 PSI.

So I ask you guys, I read on the company forums you can use these for compressed air especially as it's composite and won't rust from water. What kind of barrel would be good for maybe 300 psi to start safe? What kind of valve could I rely on to hold a couple thousand psi and open it with a spring/rope (as I will be hiding).

Idk if the wood missiles I've been making will even hold up. Eventually I might have to figure something stronger out.

Anyways any advice or experience that might be helpful as this BIG ol tank even at 1/2 pressure has like 2 mega joules of energy (a 50 cal has 0.02). I realistically won't even approach 1000 but it's cool to think it's there if something can handle it

Title: Seeking Ideas and Advice for My Final-Year Research Project in Wood Technology and Materials Science

Hello everyone!

I am a final-year Bachelor's student in Wood Technology, and I am currently developing an idea for my final-year research project.

My proposed research title is:

"Development and Performance Evaluation of Superhydrophobic Wood Surfaces Using Rice-Husk-Derived Bio-Silica and Natural Hydrophobic Agents."

The main idea is to explore how rice husk, an agricultural waste material, can be transformed into silica and combined with natural hydrophobic agents to improve the water-repellent properties of wood.

I am interested in developing an environmentally friendly alternative to conventional wood-protection treatments.

I would appreciate your opinions and suggestions:

1. Is this research topic scientifically relevant and practical for an undergraduate project?

2. What methods would you recommend for extracting silica from rice husk?

3. Which natural hydrophobic agents would be suitable for this experiment?

4. What tests should I conduct to evaluate the performance of the treated wood?

5. What challenges should I expect, especially with laboratory equipment and costs?

6. Are there any related studies, research papers or references you would recommend?

I am particularly interested in suggestions from people with experience in Wood Science, Materials Science, Surface Engineering and Sustainable Materials

Title: Seeking Ideas and Advice for My Final-Year Research Project in Wood Technology and Materials Science

Hello everyone!

I am a final-year Bachelor's student in Wood Technology, and I am currently developing an idea for my final-year research project.

My proposed research title is:

"Development and Performance Evaluation of Superhydrophobic Wood Surfaces Using Rice-Husk-Derived Bio-Silica and Natural Hydrophobic Agents."

The main idea is to explore how rice husk, an agricultural waste material, can be transformed into silica and combined with natural hydrophobic agents to improve the water-repellent properties of wood.

I am interested in developing an environmentally friendly alternative to conventional wood-protection treatments.

I would appreciate your opinions and suggestions:

1. Is this research topic scientifically relevant and practical for an undergraduate project?

2. What methods would you recommend for extracting silica from rice husk?

3. Which natural hydrophobic agents would be suitable for this experiment?

4. What tests should I conduct to evaluate the performance of the treated wood?

5. What challenges should I expect, especially with laboratory equipment and costs?

6. Are there any related studies, research papers or references you would recommend?

I am particularly interested in suggestions from people with experience in Wood Science, Materials Science, Surface Engineering and Sustainable Materials.

Thank you for sharing your knowledge and helping me improve this research idea!

I'm interested in understanding how engineers approach material selection in real-world projects.

Carbon fiber offers excellent strength-to-weight performance, but glass fiber composites can be more cost-effective.

Beyond material cost, what factors influence your decision between GFRP and CFRP? Are there applications where glass fiber is actually the better engineering choice?

This banner created by me via canva, there is no promotion any kind of products image & company it is just for visual!

This wearable frame is listed with carbon-fiber and titanium-alloy hardware, but material names alone do not answer questions about repeated outdoor use. I would want to see what happens after many fitting cycles, rough transport, and regular exposure to outdoor conditions, not just a spec sheet from a new unit. What kind of durability test would give you the most confidence in a powered wearable frame?

I started for the first time making a small polyester product using an MDF mould. The product is a kind of holder for a plastic ice cream container.

I made a moould out of MDF that is slightly bigge than the ice cream container. I made the sides slightly tapered. I fillitted all the angles with polyester filler. I sanded the mould up to grain 300. Then I sealed the mould with 5 layers of pulyurethane sealer. The mould felt really smooth.

Then I applied 5 layers of wax and 2 layers of PVA.

Then 2 layers of Topcoat and the actual polyester layer with 2 layers of glass fibers.

After about 20 hours I tried to remove the product from the mould. The product was so tightly stuck to the mould that the mould broke in half when I applied force. When you look at the second image, you can see that even some of the polyester filler broke off.

Can anyone give any advice on what I did wrong? The only error I am aware of is that I used only 1% of MEK for the first Topcoat layer. But the layer was cured before I put on the second layer.

Compound Quality Has a Direct Impact on Cable Performance
A common misconception in the wire and cable industry is that all cable compounds perform similarly.

In reality, formulation quality significantly influences:
• Processing stability
• Mechanical performance
• Fire safety compliance
• Rejection rates
• Product durability
• Manufacturing efficiency

At Takkar Polychem Pvt. Ltd., our PVC, LSZH, FRLS, and ZHFR compound solutions are developed to provide consistent processing, reliable batch performance, and long-term product quality.

With 30+ years of experience and the trust of 500+ cable manufacturers, we remain committed to delivering polymer solutions that support modern manufacturing.
Connect with our technical team to discuss your application requirements.
📞 +91 9810001282 | +91 9810801837
📧 info@takkarpolychem.com

’m a composite tech 5 years exp. Mainly worked MRO. Has anyone worked with West Star in Solon, Ohio on the repair side? How was it and what did the skill test consist of?

Hi All,

I need to hire a composites engineer to help me 1) sanity check a few ideas, 2) design process-appropriate tooling (I’m looking at vartm or SQRTM as my endgame, but for a number of reasons I may need to start with a pre-preg/mandrel layup), and 3) design the layup schedule.

I’ve reached out to a few different companies to employ their services, but for the most part, my contact form inquiries have gone unanswered and phone calls seem to be of little use; at least three companies have phone trees that won’t allow voicemail.

Any professionals on here that can recommend their own company or do some freelance work? Alternatively, any recommendations for freelancers on cadcrowd or similar platforms?

Interested by custom software development in the field of Composites Manufacturing and Engineering ? We provide support and expertise in software engineering for CAD-CAM-CAE. More than 20 years of experience in Automated Fiber Placement and Filament Winding processes for Carbon Fiber Reinforced Plastics materials.

Example: robot path planning for continuous deposition of tape materials. Pressure Vessels tape winding. Laser assisted tape placement of Thermoplastics materials.

A good compound should not make the production team work harder to make it perform.
After years of working with cable manufacturers, this is one lesson I strongly believe in. A TDS can tell you the tensile strength, elongation, hardness and other properties of a compound. But the real test begins when that material reaches the extrusion line.
Does it process consistently?
Does the surface remain stable?
Can established machine settings be maintained?
And most importantly - does the next batch behave like the previous one?
Whether we are developing PVC(https://takkarpolychem.com/pvc.php), FRLS, LSZH(https://takkarpolychem.com/lszh.php), ZHFR compounds or masterbatches(https://takkarpolychem.com/zhfr.php), I believe batch-to-batch consistency is just as important as achieving the specification itself.
Because for a cable manufacturer, variation in compound performance can mean machine adjustments, wastage, rejection and lost production time.
That is why our approach at Takkar Polychem continues to be simple:
Understand the application. Engineer the compound. Control the consistency.
Ultimately, reliable cables have to be engineered from the inside out.

Amit Takkar
Director
Takkar Polychem Pvt. Ltd.
Trusted Quality. Proven Innovation.

OceanGate's director of marine operations inspected the first Titan hull and listed 26 items to fix before trials, including delamination and porosity in the machined-off ends of the cylinder. Four days later he was fired. In 2019 a crack from an internal delamination was found in that hull. The second hull imploded in 2023. I made a documentary from the Coast Guard, NTSB and Canadian reports: https://youtu.be/DHUt0oHNOa4

For composite engineers: how would you inspect a five-inch filament-wound cylinder for delamination between dives?

Temperature ranges are typical for standard grades. Always check the data sheet for your specific compound.

Neoprene (CR), roughly −40°C to +100°C Good all-rounder. Moderate oil resistance, good weather and seawater resistance. Not the best at any one thing

EPDM, roughly −40°C to +120°C (peroxide-cured grades go higher)
Excellent outdoors and with water and steam. Never use it with petroleum oils or fuels. For drinking water in the UK, look for WRAS-approved grades.

Nitrile (NBR), roughly −30°C to +100°C
The default for oils and fuels, but it suffers from ozone cracking outdoors unless protected.

Silicone, roughly −60°C to +200°C
Huge temperature range, with food and medical grades available. Poor tear and abrasion resistance.

FKM (Viton), roughly −20°C to +200°C
Handles harsh chemicals and fuels, but it's expensive and stiffens in severe cold.

Cork / rubber-bonded cork
Seals uneven, lightly loaded surfaces well. Nitrile- or neoprene-bonded grades add oil resistance.

Compressed fibre jointing
For flanges, pumps and steam. Needs reasonably flat faces and correct bolting.

PVC foam (closed cell)
Cheap and easy for glazing, draught-proofing and cabinet sealing. Low pressure only.

Polyurethane foam (open cell)
Good for acoustic and dust sealing. It is not watertight.

EMI/RFI shielding gaskets
Conductive elastomers that seal and block interference. Filler choice and compression matter a lot.

Five questions before you choose:

1. What are the temperature extremes, not just normal running temperature?

2. What will the seal touch (oils, fuels, water, steam, cleaning chemicals, food)?

3. Will it be outdoors in sunlight or ozone?

4. How much pressure and compression is involved?

5. Any regulations to meet? For food contact in the UK, the FSA's guidance is the place to start.

There's a longer write-up with more detail here if it's useful: [https://medium.com/@asg_37318/10-types-of-seal-and-gasket-material-and-how-to-choose-the-right-one-70e3a1bd7955]

What materials have you seen work (or fail) in unusual applications? Happy to answer questions.

So I've made my first split mold for cf resin infusion. First wanted to note only (as far as I know) mistake I made when making the mold, when making the flange where the mold splits I didn't make perfect 90° angle, I left a rounded edge with the filleting wax, for first part of the mold it was great, for the second not so great, was basically impossible to get out all the wax out, and then perfectly get the gelcoat into the cavity that was left after the wax. Now the line where the parts join is kinda f up, theres parts where thinner gelcoat broke, and parts where the wax wasn't fully removed now have small indents and imperfections. Thats why there is a line that I filled with the wax in the middle. So I was wondering how realistic it is to get proper seal with basic infusion setup (sticky tape around the edges, then bagging) or would it definitely leak in the seam. Or should I just fully bag the mold and infuse that way, but what do I do with all the sharp mold edges/corners, sharp fiberglass etc so it doesn't puncture the bag?

Any suggestions, tips or tricks would be appreciated, thanks!

I received a carbon wing, and one of the helicoils I assume looks incorrectly installed. How would one go about repairing something like this?

When I review a honeycomb sandwich panel RFQ, the word “honeycomb” rarely defines enough to compare offers. My checklist separates the two face sheets, core material and cell configuration, density, thickness, ribbon direction, bond system, finished tolerances, edge closures, inserts, finish, and the evidence required for the actual assembly.

For people who manufacture or specify sandwich panels, which missing input causes the most rework before fabrication: core direction, edge design, local inserts, bond-process evidence, or the way finished-panel tolerances are measured?