Parachute Shroud Line Material?

From the Facebook Model Rocketry Fanatics page, a question:
Any suggestions on what thread or string to use on DIY parachutes for low power?

Then the answers come in - 

• "Use Kevlar thread" - Yes, it works, probably overkill and expensive.
• "Use Button and Rug Thread" -  This used to be what Estes and Centuri sold, but it's not what it once was. It is still very strong, but now more of a poly or nylon blend, subject to melting.
• "Use paper reinforcement disks" -  Not recommended. Paper rings tear, but plastic "permanent" Avery disks are stronger thin plastic.
• "Use nylon thread" - Can melt if the ejection charge hits it.
• "Use Dental Floss" - Strong, but can melt. Keep it in the medicine cabinet.

After years and messing with every possible (available at the time) string, I now use this -

Aunt Lydia's Classic (Size) 10 Crochet thread.
100% Cotton and strong. Just try to break it with a strong pull!

This cotton thread is what comes in all Odd'l rocket kits that have a parachute. I does stretch a bit when pulled hard.
You can find it at Hobby Lobby or Michael's with your 40% off coupon.

If you are a gambling man, give a good tug on pre-made parachute shroud lines supplied in kits. The lines can easily break! Now you know why your rocket recovered with a broken shroud line. I've replaced weak shroud lines on many kit parachutes.


Add some Avery Permanent PLASTIC (not paper) reinforcement disks, #5720. These are poly vinyl and won't tear when a shroud line is pulled. Some kits include paper disks. 

I'm not looking to get into debates, these are simply my recommendations for LPR plastic sheet parachutes.