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Posted: 12/3/2017 12:42:50 PM EDT
[#1]
UHMWPE is generally fine (degredation profile is only slightly worse than the 105 degree profile) in temps of 150f but shows significantly accelerated degradation when tested at 194f in as little as 200 hours of exposure.
Reference http://ws680.nist.gov/publication/get_pdf.cfm?pub_id=916161 Buy a cheap thermometer that records the max temp and keep it on or near your plate carrier. If you see temps over 150 then you should be concerned but otherwise you should be fine with the plastic plates. I prefer to buy armor based on threat profile than material -- you can pad ceramic and you can insulate UHMWPE. I believe ceramic is the only material that routinely stops both 55gr and 62gr green tip however. |
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Posted: 12/3/2017 6:39:31 PM EDT
[#2]
I use to live in FL. I’d bet $100 you’ll break 150. For the amount you’ll use them get some lvl 3+ Steel that have been tested to stop all the 5.56 threats and call it a day.
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Posted: 12/3/2017 8:09:52 PM EDT
[#3]
Quoted:
I would like to get a set of plates to put behind the rear seat of my POV. I am cautious to use my SKD ceramic as I don't want it getting cracked from continued jostling on the edge it is resting on. I am cautious about the heat of a closed truck in the southern summers degrading UHMWPE. Is steel my only alternative? Thanks |
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Posted: 12/3/2017 10:35:37 PM EDT
[#4]
Quote HistoryQuoted: I've had ceramic plates in a trunk near daily for the past six years. No problems. |
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Posted: 12/3/2017 10:47:05 PM EDT
[#5]
Quote HistoryQuoted: I’ve had ceramic plates in a trunk near daily for the past six years. No problems. |
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Posted: 12/3/2017 11:04:55 PM EDT
[#6]
Quote HistoryQuoted: I’ve had ceramic plates in a trunk near daily for the past six years. No problems. |
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Posted: 12/4/2017 8:45:05 AM EDT
[#7]
Quote HistoryQuoted: Have you x-rayed them? What temp swings do you see? Have you stored a third with your set and shot it to test them? No I didn't have a spare plate. They are in a plate carrier that is mostly "standing up" in the trunk. North Texas area so below freezing in the winter to 100+ in the summer. Trunk probably gets 150+ in the summer. |
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Posted: 12/5/2017 3:18:39 PM EDT
[#8]
Quote HistoryQuoted: X-rayed them 6 months ago. Didn't see any cracks on the X-ray. No I didn't have a spare plate. They are in a plate carrier that is mostly "standing up" in the trunk. North Texas area so below freezing in the winter to 100+ in the summer. Trunk probably gets 150+ in the summer. |
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Posted: 12/5/2017 8:08:37 PM EDT
[#9]
Quote HistoryQuoted:
If I could lay them horizontal in a trunk I would be less concerned than having to store them vertical, as I understand bumps to the edges or corners are the problem. Quote HistoryQuoted:
Quoted: I've had ceramic plates in a trunk near daily for the past six years. No problems. |
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Posted: 12/5/2017 8:31:50 PM EDT
[#10]
Any decent plate carrier will protect the edges. Are you not using a carrier?
CHRIS |
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Posted: 12/5/2017 8:50:37 PM EDT
[#11]
Ceramic... old school
new advances in technology, local sheriff wear this....lighter and from videos I have seen, will last longer.... and no worry about damaging... https://www.premierbodyarmor.com/product/premier-durus-8000-armor-2/ |
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Posted: 12/5/2017 11:35:06 PM EDT
[#12]
Quote HistoryQuoted:
Ceramic... old school new advances in technology, local sheriff wear this....lighter and from videos I have seen, will last longer.... and no worry about damaging... https://www.premierbodyarmor.com/product/premier-durus-8000-armor-2/ Before you point to that .223 rating, note that it's up to 3100fps at 50 feet. M193 loads start off at close to 3200fps at the muzzle from a 16" barrel and don't lose much of it by the 50 foot test distance. |
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Posted: 12/6/2017 12:22:11 AM EDT
[#13]
Quote HistoryQuoted:
Ceramic... old school new advances in technology, local sheriff wear this....lighter and from videos I have seen, will last longer.... and no worry about damaging... https://www.premierbodyarmor.com/product/premier-durus-8000-armor-2/ 
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Posted: 12/15/2017 5:07:55 AM EDT
[#14]
Don't allow the plate to see direct sunlight. Put a closed cell foam pad under the plate carrier. There are relatively few hours each year where the plate carrier will heat soak long enough to reach a temperature over 140F and it will never exceed 150F out of direct sunlight. My testing showed 40F over ambient to be common max when measuring a plate in carrier, out of sunlight. So remove the plate carrier if your daily high will be 110F or more.
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Posted: 12/15/2017 7:33:39 PM EDT
[#15]
Quote HistoryQuoted:
Ceramic plates are not remotely fragile like a piece of fine china. They’d be just fine in the cab of a truck. Quote HistoryQuoted:
Quoted: X-rayed them 6 months ago. Didn't see any cracks on the X-ray. No I didn't have a spare plate. They are in a plate carrier that is mostly "standing up" in the trunk. North Texas area so below freezing in the winter to 100+ in the summer. Trunk probably gets 150+ in the summer.  Attached FileI am a huge proponent of ceramic over steel. Sapi plates have saved my life and I have a set next to my bed. I am however glad I did not have them in my truck 2 months ago. This is the one time I'd go for steel. |
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