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Chilworth Technology - EXPLOSIVITY TESTING The orifice diameter is decreased from 20 mm until the increased confinement causes the reaction to burst the tube. The critical diameter is determined as the largest diameter for which an explosion is observed and is used as the criterion for classifying a material as "thermally sensitive." The test is used to assess the sensitivity of the test material to the effect of intense heat under confinement. The test is used to assess the sensitivity of a substance under confinement in a steel tube to detonative shock. www.chilworth.com /lab_explos.cfm   (1273 words)

Explosive material - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-12) The relative sensitivity of a given explosive to impact may vary greatly from is sensitivity to friction or heat. Sensitivity is expressed in terms of the temperature at which flashing or explosion of the material occurs. Sensitivity, strength, and velocity of detonation are reduced by inert materials that reduce the continuity of the explosive mass. www.newlenox.us /project/wikipedia/index.php/Explosive   (5208 words)

Acetone peroxide - Wikipedia, the free encyclopedia It is highly heat, friction, and shock sensitive. The extreme shock, heat, and friction sensitivity are due to the instability of the molecule. All forms of acetone peroxide are very sensitive to initiation and degrade in long-term storage, so they are used as explosives only by unconventional forces (e.g. en.wikipedia.org /wiki/Acetone_peroxide   (777 words)

Plastic Testing Instruments,Packaging Testing Instruments,Plastic Testing Instruments Manufacturer,Packaging Testing ... Friction could result from uneven film thickness, which leads to uneven film strength. Co-efficient of friction also tells you the degree of abuse a plastic film will sustain without damaging the contents. By checking the friction that exists between 2 surfaces covered by the same plastic material. www.prestoinstruments.com /plastic-packaing-testing.html   (626 words)

Nitroglycerin - Wikipedia, the free encyclopedia In this undiluted form it is one of the most powerful high explosives, comparable to the military explosives RDX and PETN (which are not used in munitions at full concentration because of their sensitivity) as well as the composite explosive C4. Early in the history of this explosive it was discovered that liquid nitroglycerin can be "desensitized" by cooling to 5 to 10 °C (40 to 50 °F), at which temperature it freezes, contracting upon solidification. It is possible to chemically "desensitize" nitroglycerin to a point where it can be considered approximately as "safe" as modern High Explosive formulations, by the addition of approximately 10 to 30 percent ethanol, acetone, or dinitrotoluene (percentage varies with the desensitizing agent used). en.wikipedia.org /wiki/Nitroglycerin   (1092 words)

Nat' Academies Press, (NAS Colloquium) Earthquake Prediction: The Scientific Challenge (1996) Friction includes a characteristic length that is longer than the grid size so that our models have a well-defined continuum limit. When friction is highly rate-dependent, seismicity becomes nonperiodic and ruptures of all sizes occur inside the fault. Friction is represented as a function of slip (D) and state variable Aft. www.nap.edu /books/0309058376/html/101.html   (4627 words)

Military Explosives Chapter 12 Sensitivity, strength, and velocity of detona-tion are reduced by inert materials that reduce the contin-uity of the explosive mass. The sensitivity, strength, and brisance of an explosive are all somewhat de-pendent upon oxygen balance and tend to approach their maxi-mums as oxygen balance approaches zero. Because sensitivity, brisance, and strength are prop-erties resulting from a complex explosive chemical reaction, a simple relationship such as oxygen balance cannot be de-pended upon to yield universally consistent results. www.fas.org /man/dod-101/navy/docs/fun/part12.htm   (5796 words)

[No title]   (Site not responding. Last check: 2007-10-12) It is highly friction sensitive and extreme care should be taken to avoid this. Acetone peroxide is one of the most sensitive explosive known to man. Great care would be needed to handle this explosive carefully. It is less sensitive to impact or friction than lead azide or mercury fulminate but more sensitive to heat. www.logicsouth.com /~lcoble/stuff/complete.txt   (11337 words)

Active hair-bundle motility harnesses noise to operate near an optimum of mechanosensitivity -- Nadrowski et al. 101 ... sensitivity was the stiffness of the load to which the hair Sensitivity and spontaneous movements as a function of the hair bundle's operating point. The ratio of maximal and minimal sensitivities determines the gain of the amplificatory mechanism. www.pnas.org /cgi/content/full/101/33/12195   (3389 words)

Blasting Caps Primary explosives are usually sensitive to shock, friction, and heat. FRICTION SENSITIVITY - This primary explosive is on the same order of sensitivity as is lead azide. Friction and impacts should be avoided and the material should be expected to explode at any time. www.angelfire.com /co2/contem/blasting.html   (13228 words)

Note 16   (Site not responding. Last check: 2007-10-12) Contrary to other similar models which use a weak linear Rayleigh friction, a quadratic friction (applied in the momentum equations) is shown to allow a fair representation of both the phase and amplitude of the sea level and the zonal currents in the equatorial Pacific. Other sensitivity experiments are discussed: in particular the model-data comparisons are not very sensitive to the number of baroclinic modes considered with comparable results to when only one baroclinic mode is used; on the other hand, we found a large sensitivity to friction with large improvement when a quadratic friction is used. It is concluded that this linear representation of friction in such linear models is not suitable to study the respective roles of thermocline displacement and zonal advection on ENSO time scales. www.ipsl.jussieu.fr /modelisation/note16.html   (338 words)

Model sensitivity studies   (Site not responding. Last check: 2007-10-12) To assess the importance of the determination of the estimated bottom friction ( on the cross-shelf phase are also most notable near the coast, as the phase from the coast to 1 km offshore increases with increasing friction. The sensitivity studies of the simple barotropic model have illustrated the importance of the along-shelf wave number ( storm.rsmas.miami.edu /~cook/thesis/node30.html   (436 words)

Friction Sensitivity Test Equipment by SMS Sensitivity test equipment for clients that require in-house capability and DOT approved shipping containers. The primary parts of the test apparatus are a moving anvil upon which the test sample is placed, a stationary wheel that applies a load to the sample, and a swinging pendulum that strikes the anvil to move it under the stationary wheel. The ABL Friction Apparatus may be used in Test Series 3 for DOT Classification, Test Series 1 for In-Process Simulation, and determining friction sensitivity for Explosives Testing. www.sms-ink.com /products_friction.html   (283 words)

[No title] These are ground as fine as possible, seperately, as this mix is friction sensitive, and combined in this ratio - 3:2:1 / potassium permanganate:aluminium:sulphur The resulting powder will readily ignite via a fuse and emit a blinding white flash, the finer the aluminium the faster the composition will be. It is sensitive to detonation from 2% to 12% at which point the prills are saturated and will not hold anymore oil. This explosive is very sensitive and ive never failed to detonate it using either of the peroxide explosives, to guarantee initiation a matchbox full of the explosive putty should be used however you could probably get by with half this amount. www.textfiles.com /uploads/makearse.txt   (5842 words)

Cruising World - Sorting Out Self-Steering Options Minimizing friction is essential, particularly any friction on the servo-rudder’s main shaft, which the relatively weak impulse from the sensor vane must turn. Usually, this linkage is accomplished through bevel gears, levers, and/or rods, and manufacturers use plastic bushings, roller bearings, or ball bearings (often in plastic races) to reduce friction in the linkages. Forward impact protection is with a plastic composite sheer pin, and lateral overload protection is built in by its design, which allows the pendulum rudder to swing 170 degrees side to side—also useful when you’re in port or motoring. www.cruisingworld.com /article.jsp?ID=200466&typeID=397&catID=571   (3085 words)

Functional Chemicals & Polymers > Product Information > Organic peroxides > Various testing methods | NOF ... A 5kg iron hammer falls on the top of the steel rod, and ignition or explosion of the test material is tested to observe the highest position of the iron hammer not causing ignition or explosion in ten drop tests. This method shows the sensitivity of organic peroxide against impact by a weight as well as the sensitivity to friction. Friction motion is caused under a load, and the sensitivity of the organic peroxide is studied from the relationship between load and explosion. www.nof.co.jp /english/business/chemical/product01_05.html   (595 words)

PSSI ESD Article & ESD Guidelines - Save the Boards For example, friction between a carpet and a shoe generates a charge on and an electrostatic field surrounding, the shoe sole as you walk across the carpeted floor. The massive charge generated by the friction between cold and warm air masses is discharged through the air to ground. Charges on a non-conductor must be either shielded from the sensitive device or neutralized by use of an air ionizer, which safely showers the work area with both positive and negative ions. pluginstorage.com /html/save_the_boards.html   (2355 words)

Flash Powder sensitive to friction and static electricity, and have exploded without warning. The addition of Sulfur to Flash Powder formulations increases the possibility of spontaneous combustion by the formation of Sulfurous and Sulfuric acid, and the composition's sensitivity to friction and shock. One involves shaking the two in a plastic baggie, the other involves placing the two chemicals on a sheet of paper and gently lifting opposite corners until the composition is well mixed. www.reaganwiseman.com /data/Pyro/FlashPowder.html   (824 words)

DARPA/MTO/MEMS Digital Micro-Propulsion Project Lead styphnate does not react with metals and is less sensitive to shock and friction than mercury fulminate or lead azide. This explosive is particularly sensitive to discharge of static electricity, and the dry material can be readily ignited by static discharges from the human body. Lead styphnate is approximately as sensitive as mercury fulminate to impact and has about the same order of friction sensitivity as lead azide. www.design.caltech.edu /micropropulsion/styphnate.html   (972 words)

Fireworks Safety Manual Books Ofca Sensitivity to heat, shock, friction and impact are greatly enhanced with ignition occurring, in some cases, as little as a flick of the fingernail. Be it a question of chemical compatibility or heat, friction, shock, and impact sensitivity;; we must presume an inherent and intrinsic danger exists by treating all chemical mixes with equal care. The star is very sensitive to low temperature incandescent heat ignition, yet is very stable and insensitive to friction or impact. www.skylighter.com /skylighter_info_pages/Books/fireworkssafetymanualofca.htm   (20496 words)

[No title] Although the German opinion is that in the case of Musk Xylene E and R3 should be used, the German expert agrees that some arguments in favour E and R2, because the sensitivity to impact is not too high. It is based on a number of types of apparatus which are widely used internationally (Recommendations on the Transport of Dangerous Goods: Tests and criteria, United Nations) and which usually give meaningful results. In principle, a substance is considered to present a danger of explosion in the sense of the directive if a positive result is obtained in the thermal, shock or friction sensitivity test. ecb.jrc.it /classlab/1602a7_DE_muskxylene.doc   (444 words)

Flash powder (Arno Hahma; George Herbert; Gerald L. Hurst; murr rhame) These "sparkle powders" are less sensitive to spark ignition and designed not to explode in modest quatities when unconfined. Theatrical sparkle flash powders may be very sensitive to impact and friction and may still be set off by modest sparks. A quite general rule is that >compositions containing Al and KClO4 are _very_ sensitive to static >electricity, moderately sensitive to friction and nearly insensitive to shock. yarchive.net /explosives/flash_powder.html   (2998 words)

Hairfacts: Friction for hair removal For sensitive skin, “condition” the mitt by gently rubbing on palm for a few seconds to remove the coarser grit. A few say that their skin is too sensitive and turns red after rubbing. I have found that my skin becomes less sensitive the more I use this method, and any irritation—on the first day I experienced a mild rash, which was alleviated by moisturizer (again, I only use unscented moisturizer formulated for sensitive skin)—was nothing compared to what I've endured from other hair-removal methods. www.hairfacts.com /methods/friction.html   (2247 words)

Impact Sensitivity Test Equipment by SMS SMS manufactures a Modified Bureau of Mines (MBOM) Impact Test Apparatus for clients who require in-house testing to determine the energy required to initiate an explosive by impact. Solid, liquid, or powdered materials may be tested using special holders and shields. The Modified BOM Impact Apparatus may be used in Test Series 1 for In-Process Simulation and in determining impact sensitivity for Explosives Testing. www.sms-ink.com /products_impact.html   (230 words)

Report - Dark Flash   (Site not responding. Last check: 2007-10-12) Such a mixture is quite a good cap composition despite being quite a bit more friction sensitive than shock sensitive. Ideal for breaking crossettes as it produces very little light, or anywhere else a minimum amount of space for a report composition is available, the power required is significant and a bright flash is undesirable. It's thermal sensitivity makes it a good choice, but its friction sensitivity needs to be managed, typically by coating over with something else, despite this such a match may still ignite from common abuse, like being stepped on. www.vk2zay.net /composition.php?id=47   (188 words)

Articles - Explosive material   (Site not responding. Last check: 2007-10-12) The relative sensitivity of a given explosive to impact may vary greatly from its sensitivity to friction or heat. High load density can reduce sensitivity by making the mass more resistant to internal friction. X = number of atoms of carbon, Y = number of atoms of hydrogen, Z = number of atoms of oxygen, and M = number of atoms of metal (metallic oxide produced). www.furniture-center.net /articles/Explosive   (5249 words)

Peroxides (Arno Hahma; George Herbert; Norman L. Reitzel; Wouter Visser; E. Michael Smith) Acetone peroxide is very sensitive to shock, friction and especially sparks and flame. The explosive mixture of the dimere and trimere is very, very sensitive to both friction and shock (Shock sensitivity: 0.3Nm, friction sensitivity:0.1Nm) It also tends to sublime quickly at room temp. The explosive is not suitable for commercial use (and even less suitable for any other use), because of its sublimation and decomposition. yarchive.net /explosives/peroxide.html   (1459 words)

HealthBoards - adult circumcision sensitivity/friction my question is friction is it better to have more friction to speed up the process.or give me a suggestion. I suppose that in time it will be less sensitive to touch. Don't worry, it will become less and less sensitive everyday, just be patient; soon it will feel as it was when you had foreskin. www.healthboards.com /boards/showthread.php?t=72287   (315 words)

Journal of Pyrotechnics - Issue 23 Although the impact sensitivity results reflected the change in the surface area of the particle sizes, the changes were within a narrow range of limiting impact energy (LIE) (7.5–9.1 J). Further it was difficult to pinpoint a particular sieve fraction as sensitive since the response to explosion depended not only on the flash composition and the particle size but also on the density and the compactness of the chemicals. Experimentally determined thermal and mechanical (impact and friction) sensitivity data of a flash composition mixture are subjected to statistical and graphical analysis in order to understand the mechanism of triggering accidents. www.jpyro.com /journal/issue_23/index.htm   (1646 words)

Flexural Psoriasis - Flexural Psoriasis Information It is localized in the flexural surfaces of the skin, e.g., armpit, groin, under the breast, and other skin folds. Flexural psoriasis is a ggravated by sweat and friction. The skin is sensitized by applying coal tar ointment or by taking oral psoralens The person is then exposed to ultraviolet light. www.cosmeticsdiary.com /flexural-psoriasis.htm   (544 words)

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