Reply
 
Thread Tools Display Modes
 
Old 01-10-2020, 11:01 AM   #1
Bus Nut
 
TheHubbardBus's Avatar
 
Join Date: Apr 2019
Location: Hotzona
Posts: 842
Year: 2003
Coachwork: IC
Chassis: 3800
Engine: Navistar T444e
Rated Cap: 24
amber lights vs red: ambers cracked, reds not.

This is kind of an oddball question/observation. While examining the lights on our bus, I noticed every single one of the amber light lenses (Weldon, markers & flashers) were riddled with age/stress cracks (those tiny spiderweb cracks you can barely see), while the reds were clear as a bell. There was no sign whatsoever the reds had been swapped out or were newer... I'm fairly certain red & amber alike are original equipment.

Does anyone know the reason for this? Slightly different plastic composition? Differences in light transmission? Reds reflecting wavelengths that create these micro-cracks where amber does not?

I'd provide pics, but the cracks I'm talking about are so fine, they wouldn't show.
__________________
-Sharon & Jody
Mr Beefy Short Bus Acquisition & Build Thread
TheHubbardBus is offline   Reply With Quote
Old 01-10-2020, 11:05 AM   #2
Bus Nut
 
WIbluebird's Avatar
 
Join Date: Jun 2015
Location: Wisconsin
Posts: 798
Year: 2001
Coachwork: Bluebird
Chassis: All American
Engine: 8.3 Cummins ISC
Rated Cap: 75
No idea, I pulled mine and blocked the holes off with sheet metal and body filler. Wisconsin is one state that requires removal of all school bus equipment prior to conversion.

If I had to guess its probably just UV decompisition affecting different colors.
WIbluebird is offline   Reply With Quote
Old 01-10-2020, 11:06 AM   #3
Skoolie
 
sepudo's Avatar
 
Join Date: Dec 2019
Location: Socal and Vegas
Posts: 128
Year: 2003
Coachwork: Thomas
Chassis: fs65
Engine: 7.2 catapillar 3126
Rated Cap: 41 students
Probably just a difference in the chemical makeup that makes the amber color of the lense. I had an uncle work in plastics (pens, disposable razors, etc) pigments can make a plastic compound stronger or weaker.
__________________
@drivingdharma
sepudo is offline   Reply With Quote
Old 01-10-2020, 11:17 AM   #4
Bus Crazy
 
musigenesis's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 2,343
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
Interesting article on colorants in plastics: https://www.ptonline.com/articles/un...ience-of-color

In the 90s, plastics manufacturers started to get rid of heavy metal colorants like cadmium and lead, and their replacements sometimes had negative effects on the properties of the plastics that only emerged many years later. The article says the usual casualty of this was the ductility, which would make the plastic more brittle.
__________________
Rusty 87 build thread
musigenesis is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:25 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×