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  #21  
Old 05-10-2013, 10:59 PM
homey homey is offline
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Beryllium flying out of speakers through the air. Hay now
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  #22  
Old 05-11-2013, 11:30 AM
Still-One Still-One is offline
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If someone is concerned, why would you buy them?

If you are not concerned, no reason not to buy them?
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  #23  
Old 05-11-2013, 04:06 PM
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How much discount i would expect to the tads?
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  #24  
Old 05-12-2013, 02:21 AM
harri009 harri009 is offline
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Quote:
Originally Posted by dcc View Post
Hope you have grills on your speaker to keep little fingers away from the Beryllium drivers,
they crack like egg shells
That would suck
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  #25  
Old 05-12-2013, 05:11 PM
hifikontoen hifikontoen is offline
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Does not seem that anyone so far (including myself) have a good answer to the thread starter regarding danger with beryllium.
I hope somebody will have an answer because it is an interesting subject, especially regarding owners of such speakers having kids at their home (which may do the "strangest" things with the speakers).
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  #26  
Old 05-13-2013, 12:15 AM
radio-radio radio-radio is offline
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I think this thread poses more hazard to ones's health then Be as used in the TAD's. Andrew Jones is a physicist by training and so I can't imagine him or Pioneer's legal department putting a dangerous product into the marketplace (unless you consider dangerous the sheer weight of their components or the potential dangers to one's finances from hearing them in use.


Here is some info about Beryllium that seems to indicate it's stable and exists in trace form in many other products.


"Beryllium is the only stable light metal with a relatively high melting point. Although it is readily attacked by alkalies and nonoxidizing acids, beryllium rapidly forms an adherent oxide surface film that protects the metal from further air oxidation under normal conditions. These chemical properties, coupled with its excellent electrical conductivity, high heat capacity and conductivity, good mechanical properties at elevated temperatures, and very high modulus of elasticity (one-third greater than that of steel), make it valuable for structural and thermal applications. Beryllium’s dimensional stability and its ability to take a high polish have made it useful for mirrors and camera shutters in space, military, and medical applications and in semiconductor manufacturing. Because of its low atomic weight, beryllium transmits X-rays 17 times as well as aluminum and has been extensively used in making windows for X-ray tubes. Beryllium is fabricated into gyroscopes, accelerometers, and computer parts for inertial guidance instruments and other devices for missiles, aircraft, and space vehicles, and it is used for heavy-duty brake drums and similar applications in which a good heat sink is important. Its ability to slow down fast neutrons has found considerable application in nuclear reactors.

Much beryllium is used as a low-percentage component of hard alloys, especially with copper as the main constituent but also with nickel- and iron-based alloys, for products such as springs. Beryllium-copper (2 percent beryllium) is made into tools for use when sparking might be dangerous, as in powder factories. Beryllium itself does not reduce sparking, but it strengthens the copper (by a factor of 6), which does not form sparks upon impact. Small amounts of beryllium added to oxidizable metals generate protecting surface films, reducing inflammability in magnesium and tarnishing in silver alloys."
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  #27  
Old 05-13-2013, 12:58 AM
junker junker is offline
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Here is the MSDS for solid metallic beryllium:

http://materion.com/ResourceCenter/E...lliumSolid.pdf

The health effects seem to be pretty mild even with particulate metallic beryllium. The edited health effects are listed below. Obviously, there are some health effects with chronic particulate sources particularly in some pre-1950's work environments. But overall it looks pretty benign.

2.2.1. Inhalation
Particulate containing those elements listed in Section 3 can cause irritation to the nose, throat, lungs and mucous membranes.

The beryllium in this product is not known to cause acute health effects.

2.2.2. Ingestion
The health effect of ingestion of beryllium in the form found in this product is unknown.

2.2.3. Skin
Beryllium: Particulate that becomes lodged under the skin has the potential to induce sensitization and skin lesions.
2.2.4. Eyes
Exposure may result from direct contact with airborne particulate or contact to the eye with contaminated hands or clothing. Damage can result from irritation or mechanical injury to the eyes by particulate.

2.2.5. Chronic(long-term health effects)
Beryllium: Inhaling particulate containing beryllium may cause a serious, chronic lung disease called chronic beryllium disease (CBD) in some individuals. Over time, lung disease can be fatal. Chronic beryllium disease is a hypersensitivity or allergic condition in which the tissues of the lungs become inflamed. This inflammation, sometimes with accompanying fibrosis (scarring), may restrict the exchange of oxygen between the lungs and the bloodstream. Medical science suggests that CBD may be related to genetic factors.

2.2.6. Carcinogenic References
Beryllium: The International Agency for Research on Cancer (IARC) lists beryllium as a Group 1 – Known Human Carcinogen. IARC lists beryllium as a known human carcinogen (Group 1) and notes that the work environment of workers involved in refining, machining and producing beryllium metal was associated with an increased risk of lung cancer, “the greater excess was in workers hired before 1950 when exposures to beryllium in the work place were relatively uncontrolled and much higher than in subsequent decades”; and “the highest risk for lung cancer being observed among individuals diagnosed with acute beryllium-induced pneumonitis, who represent a group that had the most intense exposure to beryllium.” IARC further noted that “Prior to 1950, exposure to beryllium in working environments was usually very high, and concentrations exceeding 1 mg/m3 [1000 micrograms per cubic meter] were not unusual.”
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  #28  
Old 05-13-2013, 02:08 AM
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GaryProtein GaryProtein is offline
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The danger with beryllium exists in manufacturing, especially with regard to casting beryllium where its vapor could be released during the heating of the molten metal. The beryllium is used in some alloys because it lowers the melting points of various alloys and also because it decreases surface tension of certain alloys in the casting process.
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  #29  
Old 05-20-2013, 11:15 PM
Mike Gillespie Mike Gillespie is offline
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Talking about what could be dangerous around kids... What about lead shot in speaker stands, turntable stands, etc.
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  #30  
Old 05-20-2013, 11:40 PM
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GaryProtein GaryProtein is offline
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I think people are going overboard worrying about things that will never happen.

Beryllium copper components are used on MANY brass and brass woodwind instruments, and they come a lot closer to the mouth of the user than the Ping beryllium copper golf clubs or speaker cones.

Last edited by GaryProtein; 05-21-2013 at 09:40 PM.
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