Reading an old WRB post he mentioned excessive heat can damage nylons/plastic fishing lines. If anyone has more detail let me know, I store my line indoors at the moment because garage is at 109, got to believe that is not good for nylon fishing lines.

I've read that temps above 105 will seriously affect nylon monofilament...I'd have to think that even getting close to that would start degrading it.

 

I'd even keep it out of the boat if you park outside, even in shade or under cover. Think of a closed car and how hot it can get in there...now apply that to your storage compartments in the boat.

 

I pull my rods out of the F-9 end of each trip...and the case that has my leader material/spare line as well. All goes into the basement which sits at around 65-70 year round until the next trip.

My rods have always stayed in the boat and I’ve never had a problem. 

For mono, it seems 105 degrees F seems to be the concensus threshold.  Here's a relevant article that cover several line types: https://outdoorskilled.com/can-a-fishing-line-withstand-heat/

We had baseboard heaters at my family's lake house. my dad left some rods leaning against the wall over one while we were gone. The thermostat was set as low as possible. The line was brittle next time he used it. I hypothesize that the constant changing of temps affected the line even though it didn't get very "hot" in the house. 

I think UV light is much more harmful than heat. Air temp. isn’t something I’ve ever worried about.

here's a list for 120 plastics

https://omnexus.specialchem.com/polymer-properties/properties/max-continuous-service-temperature

 

Nylon isn't on the list, but it's 180 F. 

I’ve never put anything inside and my cheap 6 lb mono is hard to break. It usually cuts through my hand first 

Hell I fished in hotter than 105 temps about 20 times this summer. 

As long as you keep 6’ seperation between spools you’re safe. Couldn’t resist.

2 hours ago, QED said:

For mono, it seems 105 degrees F seems to be the concensus threshold.  Here's a relevant article that cover several line types: https://outdoorskilled.com/can-a-fishing-line-withstand-heat/

Thanks!

1 hour ago, the reel ess said:

though it didn't get very "hot" in the house. 

Very interesting

1 hour ago, Cbump said:

Hell I fished in hotter than 105 temps about 20 times this summer. 

Me too, it's been 105-111 in the garage the past month, was just thinking the long term effects yknow, 

1 hour ago, TnRiver46 said:

6 lb mono is hard to break. It usually cuts through my hand first 

I see, thanks

Glass Transition temperatures indicate when a plastic deforms or creeps. Nylon (PA) fishing line is extruded neat (no fillers) with UV inhibitors, GT is rated about 46C/ 118 F.

The factor to consider is time under pressure creating cold flow. Nylon line stored tight on small diameter fishing reels takes a set form cold flow do to time under pressure, add heat near the GT the line is permanently damaged. 

Time to re spool line if stored in hot temps.

Copolymers are blend with Nylon and  polyesters.

Tom

59 minutes ago, WRB said:

Glass Transition temperatures indicate when a plastic deforms or creeps. Nylon (PA) fishing line is extruded neat (no fillers) with UV inhibitors, GT is rated about 46C/ 118 F.

The factor to consider is time under pressure creating cold flow. Nylon line stored tight on small diameter fishing reels takes a set form cold flow do to time under pressure, add heat near the GT the line is permanently damaged. 

Time to re spool line if stored in hot temps.

Copolymers are blend with Nylon and  polyesters.

Tom

Excellent info, great information!