Newsgroup: it.scienza.chimica
Titolo: Problemi con un vecchio motore

Circa venti anni fa ho comprato un aeroplano a motore guidato da due fili.
Il motore funzionava con una miscela di etere, Vaselina, benzia ma nei
negozzi di modellismo mi dicono che e' impossibile trovare l'etere, esiste
una sostanza simile per
sostituirlo nella miscela o devo buttare il motore e comprare un'altro?
P.s. sono gia 4 giorni che ho scritto questo messaggio ed ncora non lo
visualizzo , forse non funziona bene il server?

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L'etere lo si trova facilmente in farmacia!!
oppure se ne vuoi quantità più elevate rivolgiti a ditte che
forniscono prodotti chimici, non penso che ci siano problemi per
averlo.
                      ..*---====~^°|MK|°^~====---*..
        .¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.
          | Perchè - quando si è sbagliato - si dice "un'altra |    
          | volta  saprò  come fare", quando si dovrebbe dire: |   
          | "un'altra volta so già come farò"?                 |   
          |                                     Cesare Pavese  |
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
          |                 ICQ:  77511075                     |
          |             M.K.@nospamSoftHouse.net               |
          |                                                    |
          |           Per scivermi, rimuovi "nospam"           |
 
        .¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.

 averlo.
Ma ce ne sono nel maneggiarlo...
:-))))
Soprattutto in estate, è troppo rischioso.
Ciao
Walter
_______________________________________________________________
Walter Peris
GAEM Home Page: 
http://www.gaem.it
walte...@tre.it
 (sostituisci tre con iol)
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Guarda qualche foto su 
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_______________________________________________________________
Nessuna montagna di esperimenti potrà dimostrare che ho ragione,
ma un solo esperimento potrà dimostrare che ho torto.
                                                  (A. Einstein)
_______________________________________________________________

Non è questione di reperirlo, è che ha un tensione di vapore estremamente
bassa, può accendersi molto facilmente e produce fiamme anche incolori. E'
necessario conosce quello che si maneggia ed è consigliabile sempre leggere
le schede di sicurezza e di compatibilità dei materiali (quelle chiamate
MSDS, material safety datasheet). Inoltre l'etere (etilico) produce problemi
al SNC. La persistenza di etere in luoghi non idonei (vedere
DL.626/94:armadi areati, antidefragranti e tipo almeno REI90) può portare
alla formazioni di perossidi, estremamente reattivi ed esplosivi.
Occhio a chi maneggia un solvente di questo genere!
  M A T E R I A L  S A F E T Y  D A T A  S H E E T
SECTION 1. - - - - - - - - - CHEMICAL IDENTIFICATION- - - - - - - - - -
    CATALOG #:            38911
SECTION 2. - - - - - COMPOSITION/INFORMATION ON INGREDIENTS - - - - - -
    CAS #:   115-10-6
    MF: C2H6O
    EC NO:  204-065-8
  SYNONYMS
    DEMEON D * DIMETHYL OXIDE * DME * DYMEL A * ETHER, DIMETHYL * ETHER,
    METHYL * METHANE, OXYBIS- (9CI) * METHOXYMETHANE * WOOD ETHER *
SECTION 3. - - - - - - - - - - HAZARDS IDENTIFICATION - - - - - - - - -
  LABEL PRECAUTIONARY STATEMENTS
    FLAMMABLE (USA)
    HIGHLY FLAMMABLE (EU)
    IRRITANT
    IRRITATING TO EYES, RESPIRATORY SYSTEM AND SKIN.
    DANGER: FLAMMABLE HIGH-PRESSURE LIQUID AND GAS.
    KEEP AWAY FROM SOURCES OF IGNITION - NO SMOKING.
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    IN CASE OF INSUFFICIENT VENTILATION, WEAR SUITABLE
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    IMMEDIATELY (SHOW THE LABEL WHERE POSSIBLE).
    AIR SENSITIVE
    CYLINDER TEMPERATURE SHOULD NOT EXCEED 125 F(52 C).
    DO NOT PUNCTURE OR INCINERATE THIS CYLINDER.
SECTION 4. - - - - - - - - - - FIRST-AID MEASURES- - - - - - - - - - -
    IN CASE OF CONTACT, IMMEDIATELY FLUSH EYES OR SKIN WITH COPIOUS
    AMOUNTS OF WATER FOR AT LEAST 15 MINUTES WHILE REMOVING CONTAMINATED
    CLOTHING AND SHOES.
    IF INHALED, REMOVE TO FRESH AIR. IF NOT BREATHING GIVE ARTIFICIAL
    RESPIRATION. IF BREATHING IS DIFFICULT, GIVE OXYGEN.
    IF SWALLOWED, WASH OUT MOUTH WITH WATER PROVIDED PERSON IS CONSCIOUS.
    CALL A PHYSICIAN.
SECTION 5. - - - - - - - - - FIRE FIGHTING MEASURES - - - - - - - - - -
  EXTINGUISHING MEDIA
    DO NOT EXTINGUISH BURNING GAS IF FLOW CANNOT BE SHUT OFF IMMEDIATELY.
    USE WATER SPRAY OR FOG NOZZLE TO KEEP CYLINDER COOL. MOVE CYLINDER
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  SPECIAL FIREFIGHTING PROCEDURES
    WEAR SELF-CONTAINED BREATHING APPARATUS AND PROTECTIVE CLOTHING TO
    PREVENT CONTACT WITH SKIN AND EYES.
    DANGER: FLAMMABLE HIGH-PRESSURE LIQUID AND GAS.
  UNUSUAL FIRE AND EXPLOSIONS HAZARDS
    MAY FORM EXPLOSIVE MIXTURES WITH AIR.
    VAPOR MAY TRAVEL CONSIDERABLE DISTANCE TO SOURCE OF IGNITION AND
    FLASH BACK.
SECTION 6. - - - - - - - - ACCIDENTAL RELEASE MEASURES- - - - - - - - -
    EVACUATE AREA AND KEEP PERSONNEL UPWIND.
    SHUT OFF ALL SOURCES OF IGNITION.
    WEAR SELF-CONTAINED BREATHING APPARATUS, RUBBER BOOTS AND HEAVY
    RUBBER GLOVES.
    SHUT OFF LEAK IF THERE IS NO RISK.
    VENTILATE AREA AND WASH SPILL SITE AFTER MATERIAL PICKUP IS COMPLETE.
SECTION 7. - - - - - - - - - - HANDLING AND STORAGE- - - - - - - - - - -
    REFER TO SECTION 8.
  ADDITIONAL INFORMATION
    MAY FORM EXPLOSIVE PEROXIDES ON EXPOSURE TO AIR. REACTS EXPLOSIVELY
    WITH OZONE, FLUORINE, AND CHROMIC ANHYDRIDE.
SECTION 8. - - - - - - EXPOSURE CONTROLS/PERSONAL PROTECTION- - - - - -
    CHEMICAL SAFETY GOGGLES.
    COMPATIBLE CHEMICAL-RESISTANT GLOVES.
    MECHANICAL EXHAUST REQUIRED.
    NIOSH/MSHA-APPROVED RESPIRATOR IN NONVENTILATED AREAS AND/OR FOR
    EXPOSURE ABOVE THE ACGIH TLV.
    DO NOT BREATHE GAS.
    DO NOT GET IN EYES, ON SKIN, ON CLOTHING.
    AVOID PROLONGED OR REPEATED EXPOSURE.
    WASH THOROUGHLY AFTER HANDLING.
    IRRITANT.
    KEEP TIGHTLY CLOSED.
    KEEP AWAY FROM HEAT, SPARKS, AND OPEN FLAME.
    CYLINDER TEMPERATURE SHOULD NOT EXCEED 125 F(52 C).
    STORE AND USE WITH ADEQUATE VENTILATION.
    CONTENTS UNDER PRESSURE.
    WARNING: SUCK-BACK INTO CYLINDER MAY CAUSE RUPTURE.
    USE BACK-FLOW-PREVENTIVE DEVICE IN PIPING.
    USE WITH EQUIPMENT RATED FOR CYLINDER PRESSURE, AND OF COMPATIBLE
    MATERIALS OF CONSTRUCTION. CLOSE VALVE WHEN NOT IN USE AND WHEN EMPTY.
    MAKE SURE CYLINDER IS PROPERLY SECURED WHEN IN USE OR STORED.
SECTION 9. - - - - - - - PHYSICAL AND CHEMICAL PROPERTIES - - - - - - -
  APPEARANCE AND ODOR
    COLORLESS GAS
  PHYSICAL PROPERTIES
    EXPLOSION LIMITS IN AIR:
      UPPER                                    27%
      LOWER                                    3.4%
    AUTOIGNITION TEMPERATURE:        662 F           349C
    VAPOR PRESSURE:      4000MM 20 C       >760MM 25 C
    VAPOR DENSITY:     1.62
SECTION 10. - - - - - - - - -STABILITY AND REACTIVITY - - - - - - - - -
  INCOMPATIBILITIES
    STRONG OXIDIZING AGENTS
    STRONG ACIDS
    HALOGENS
  HAZARDOUS COMBUSTION OR DECOMPOSITION PRODUCTS
    TOXIC FUMES OF:
    CARBON MONOXIDE, CARBON DIOXIDE
SECTION 11. - - - - - - - - - TOXICOLOGICAL INFORMATION - - - - - - - -
  ACUTE EFFECTS
    MAY BE TOXIC BY INHALATION AND IF SWALLOWED.
    VAPOR OR MIST IS IRRITATING TO THE EYES, MUCOUS MEMBRANES AND UPPER
    RESPIRATORY TRACT.
    CAUSES SKIN IRRITATION.
    EXPOSURE CAN CAUSE:
    INTOXICATION, BLURRED VISION, HEADACHES, DIZZINESS, EXCITATION,
    PHARYNGITIS, CONVULSIONS, RESPIRATORY DISTRESS, ASPHYXIA, PNEUMONITIS,
    UNCONSCIOUSNESS AND DEATH. LIVER, KIDNEY AND BRAIN INJURY MAY OCCUR.
    CONTACT WITH SKIN OR EYES MAY RESULT IN FROSTBITE, REDNESS, PAIN AND
    BLURRED VISION DUE TO RAPID EVAPORATION OF LIQUID.
  RTECS #: PM4780000
    METHYL ETHER
  TOXICITY DATA
    IHL-RAT LC50:308 GM/M3                        TOXID9 1,79,1981
    ONLY SELECTED REGISTRY OF TOXIC EFFECTS OF CHEMICAL SUBSTANCES
    (RTECS) DATA IS PRESENTED HERE. SEE ACTUAL ENTRY IN RTECS FOR
    COMPLETE INFORMATION.
SECTION 12. - - - - - - - - - ECOLOGICAL INFORMATION - - - - - - - - - -
    DATA NOT YET AVAILABLE.
SECTION 13. - - - - - - - - - DISPOSAL CONSIDERATIONS - - - - - - - - -
    CAUTION: NO-RETURN CYLINDER. DO NOT REUSE. EMPTY CYLINDER WILL CONTAIN
    HAZARDOUS RESIDUE. FOLLOW PROPER DISPOSAL TECHNIQUES.
    OBSERVE ALL FEDERAL, STATE AND LOCAL ENVIRONMENTAL REGULATIONS.
SECTION 14. - - - - - - - - - - TRANSPORT INFORMATION - - - - - - - - -
    CONTACT FLUKA CHEMICAL COMPANY FOR TRANSPORTATION INFORMATION.
SECTION 15. - - - - - - - - - REGULATORY INFORMATION - - - - - - - - - -
  EUROPEAN INFORMATION
    EC INDEX NO:     603-019-00-8
    HIGHLY FLAMMABLE
    IRRITANT
    R 12
    EXTREMELY FLAMMABLE.
    S 9
    KEEP CONTAINER IN A WELL-VENTILATED PLACE.
    S 16
    KEEP AWAY FROM SOURCES OF IGNITION - NO SMOKING.
    S 33
    TAKE PRECAUTIONARY MEASURES AGAINST STATIC DISCHARGES.
  REVIEWS, STANDARDS, AND REGULATIONS
    OEL=MAK
    OEL-GERMANY:TWA 1000 PPM (1910 MG/M3) JAN 1993
    OEL-AUSTRIA: MAK 1000 PPM (1910 MG/M3), JAN1999
    OEL-DENMARK: TWA 1000 PPM (1885 MG/M3), JAN1999
    NOHS 1974: HZD 81811; NIS 7; TNF 897; NOS 12; TNE 50005
    NOES 1983: HZD 81811; NIS 3; TNF 223; NOS 8; TNE 2282; TFE 75
    EPA TSCA SECTION 8(B) CHEMICAL INVENTORY
    EPA TSCA SECTION 8(D) UNPUBLISHED HEALTH/SAFETY STUDIES
    EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, DECEMBER 1999
SECTION 16. - - - - - - - - - - OTHER INFORMATION- - - - - - - - - - - -
    THE ABOVE INFORMATION IS BELIEVED TO BE CORRECT BUT DOES NOT PURPORT TO
    BE ALL INCLUSIVE AND SHALL BE USED ONLY AS A GUIDE. SIGMA, ALDRICH,
    FLUKA SHALL NOT BE HELD LIABLE FOR ANY DAMAGE RESULTING FROM HANDLING
    OR FROM CONTACT WITH THE ABOVE PRODUCT. SEE REVERSE SIDE OF INVOICE OR
    PACKING SLIP FOR ADDITIONAL TERMS AND CONDITIONS OF SALE.
    COPYRIGHT 1999 SIGMA-ALDRICH CO.
    LICENSE GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL USE ONLY
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