I was the Senior NCO for the UH-60A Blackhawk Helicopter from New Equipment Training Team (NETT) January 1978 to Dec 1982, all because I opened my mouth about the other instructors who were chosen for positions on the team. Most of them would be retired before the actual training would be taking place. The Sgt Maj tp me to give him a list of who I would send. I gave him ten names and mine was not one of them. He then informed me I would be on the team.
We went to Stratford, CT for training at Sikorsky
facilities there and when we were going through
the Aircraft structural portion they said that
Kevlar was invented by a Woman, that Kevlar was 5 times stronger than steel on an equal weight basis
and that when working or repairing Kevlar, protective gear must be worn as there was some
bad stuff in the mix.
Finally, The Blackhawk main Rotors had a Kevlar
honeycomb filler along with a metal seam less spar. The outer covering (Skin) was also Kevlar.
The main Rotor blade repair kit consisted of a router with bits, Various round patches, with
metal template for use with the router. Also included in the kit was a heat pack that clamped over the patched area and clamped down the theory was that the rotor blade could be hit with small arms fire, repaired and put back on a chopper.
In Vietnam we developed a means to repair UH-1
Huey blades, we never had a patch slung off, but it would have been much better if we had some JBWeld.
Any way, my question is are you all aware that Kevlar is able to hurt you?
Not putting Kevlar down mind you just thought
you might like to hear another angle.
and then repaired.
please disregard after my name. Sometimes my brain does not engage when fingers do
Here is the MATERIAL SAFETY DATA SHEET for Kevlar aramid fabric. Doesn't look too bad.
SECTION 6 - REACTIVITY DATA
HAZARDOUS POLYMERIZATION: Will not occur
CONDITIONS/MATERIALS TO AVOID: None Known
HAZARDOUS DECOMPOSITION PRODUCTS: None generated under normal storage or handling conditions. Heat generated by laser or other types of cutting of composites containing Aramid Fiber (example KEVLARR) generates a variety of toxic off gases, some of which may cause irritation of the respiratory tract.
SECTION 7 - HEALTH HAZARD DATA
POTENTIAL ROUTES OF ENTRY: Inhalation, skin contact
EFFECTS OF OVEREXPOSURE: Direct skin contact with aramid as dust may cause mechanical irritation and transitory dermatitis. Breathing of fibers or dust may cause mechanical irritation of the mouth, nose, and throat. For additional information see Section 8.
EMERGENCY AND FIRST AID PROCEDURE:
Inhalation: Move to fresh air area.
Ingestion: Not likely to occur through normal use, should ingestion occur seek medical attention.
Eyes: Flush with flowing water for 15 minutes - seek medical attention
Skin: Flush with ample cool water followed by washing with mild soap to remove accumulated fibers.
CARCINOGEN: See section 8.
SECTION 8 - SPECIAL PROTECTION REQUIRED
Pertaining to Aramid Fibers (KEVLAR R)***
"As shipped, KEVLAR aramid fiber products do not pose a hazard. KEVLAR staple and pulp contain a small amount of respirable fibers which may become airborne during opening, mixing, carding, or regrinding waste products containing KEVLAR. When mechanically working KEVLAR fiber or materials containing KEVLAR in operations such as cutting, machining, grinding, crushing or sanding, airborne respirable fibers may be formed. Repeated or prolonged inhalation of excessive concentration of respirable fibers may cause permanent lung injury.
ANIMAL DATA: Oral ALD: 7500 mg/kg in rats
No worries. That Kevlar lining is inside the hogshead! And oil soaked, so no dust or debris can be a hazard to human intake, unless you like chewing on used oily Kevlar linings.
Plus no trimming is needed either.
MSDS on Kevlar:
I never did really worry about it, because the Sikorsky instructors were not the cream of the crop, But back then the MSDS for Kevlar was being developed. At Lockheed Martin It was always MSDS this and MSDS that. I thought I knew everything,
but learned a lot more.