I think that the aramide is doped to enhance specific attributes or characteristics, the charateristics are all over the place from source to source I've read. Reading the thread on thread from Randy I went topside and tried out a lighter on the thread for a running line and found that it does melt with a BIC, but chars with the Storm lighter, and with that, read the cut-and-paste following. Randy, the stuff melted for me, and we paid the $$$ a while back when we did the running rigging, and its braided aramide and not aramide with a dacron sheath like the usual stuff around. I have no idea what those temps were from the lighter, we're out here off Catalina but if it's important, I can run a sample when we get home

This is quoted from one source:
(http://www.somac.co.uk/kevlar-properties.htm)

Kevlar® is used extensively in the protective clothing industry, due to its' resistance to chemicals, and heat. Its’ high specific strength mean that if an article reinforced with Kevlar® does break, it does not do so instantly, but progressively – providing a "non-catastrophic failure mode" allowing a margin of safety.

Strength: Kevlar® has the highest specific strength of any commercially available fibre, being twice as strong as Nylon, and four times as strong as Nomex®. It is also light, and its’ strength to weight ratio makes it five times as strong as steel.

Temperature resistance: Kevlar® has good thermal stability, retaining a high percentage of room temperature properties at temperatures up to 300 degrees c after 1 – 2 hours exposure in air. It does not melt, or support combustion, but will oxidise to a cinder at 400 – 430 degrees c. At the other end, at temperatures as low as –196 degrees c Kevlar® shows no embrittlement of loss of strength.
Chemical resistance: Unaffected by exposure to solvents, fuels, lubricants or salt water. Chemical resistance is excellent except for a few strong acids (which will dissolve it).
Ultraviolet stability: Exposed Kevlar® is affected by U/V light, but degradation is on the outer layer only, and is not progressive. No strength loss after exposure.

Here's some good links to read over a beer or two, or when one can't sleep, a couple are real snoozers...
http://www.tsgc.utexas.edu/tadp/1996/reports/tech/material2.html
http://www.islandone.org/LEOBiblio/SPBI1MA.HTM
http://www.fhwa.dot.gov/bridge/frp/frp197.htm
http://www.advancedcomposites.com/custom.htm
http://www.vectorply.com/kevlar.pdf
http://www.vectorply.com/hybrid.pdf
http://goliath.inrs-ener.uquebec.ca/surfsci/posters/Mo09.pdf

: Actually, we are using kevlar for its flame retardant capabilities. Kevlar
: has a melting point of 500 degrees C or 932 degrees F. But, most kevlar
: materials are combined with other materials. The thread we are using burns
: easily by itself, but when sewn to a panel, it can withstand 20 minutes of
: direct flame without being consumed. The tape seems to have a sizing in it
: that burns off, leaving the kevlar fibers.