Hola telescoperos envio data sheet de oxido de cerio Saludos ...Mauricio Mundo Astronomico c_lobos2003@xxxxxxx escribió: Telescoperos Ricardo González Nuestro portal es //www.freelists.org/webpage/telescoperos Hola amigos Perdon por meterme pero segun mi experiencia no es la brea o la colofonia el problema sino el abrasivo, ese oxido de cerio blanco para mi es oxido de titanio y es muy rapido para pulir y tuve problemas similares con la Gugolz, la solucion es disolver el abrasivo en agua (Destilada mejor) y decantarla unas 24 hrs. Ese oxido tiende a formar grumos y actua como un abrasivo mas grande dañando la brea incluso el vidrio. Si no te resulta cambialo a oxido de cerio rosado (verdadero) o rouge. Hay que tener algo de experiencia con ese oxido. De todas maneras siempre traten de terminar con rojo. Saludos Claudio Wolf On Fri, 22 Aug 2008 10:25:57 -0400 "Miranda Osvaldo" wrote: > Telescoperos Ricardo González > Nuestro portal es //www.freelists.org/webpage/telescoperos > > Aldo Moraga, te cuento que con David Molina, hemos estado trabajando unos >espejos con Torta de Colofonía, nos ha dado algunos problemas, a ver si nos >puedes ayudar: > > Hicimos varios intentos, primero diluimos la colofonía con aguaras, la torta >queda bien, pero al poco trabajar con el cerio blanco (el de Mundo >Astronómico), la superficie se quebraja y se saltan pequeños pedazos, >obviamente dando problemas en el pulido, me da la impresión que en la >combinación con el cerio se cristaliza y se quiebra. > > Luego hicimos un intento diluyendo la colofonía con cera virgen, con esto >queda mas flexible la torta y no se quebraja, pero al poco trabajar, por >desgaste se forma un polvillo que hace grumos con el cerio y tenemos los >mismos problemas con el pulido. > > ¿ Nos puedes ayudar con este tema ? > > Saludos > > > Si usted desea ser removido de la lista solo accese > //www.freelists.org/list/telescoperos > y seleccione "unsubscribe". > > > > > Si usted desea ser removido de la lista solo accese //www.freelists.org/list/telescoperos y seleccione "unsubscribe". __________________________________________________ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! Regístrate ya - http://correo.yahoo.esTitle: Cerium Oxide MATERIAL SAFETY DATA SHEET
|
MATERIAL SAFETY DATA SHEET |
|
SECTION I - NAME & PRODUCT |
| ADDRESS: | CONTACT:
|
| TRADE NAME, COMMON NAME OR
SPECIFICATION:
CERIUM OXIDE |
EMERGENCY TELEPHONE: |
| CHEMICAL FAMILY OR PRODUCT
TYPE:
Optical Polishing Compound-Rare Earth |
APPROVED BY:
DATE: |
|
SECTION II - COMPOSITION |
|
CHEMICAL NAME |
% |
COMMON NAME |
REG* Y/N |
CAS # |
OSHA PERMISSIBLE EXPOSURE LIMIT |
ACGIH TLV |
CARCINOGEN* Y/N |
| Rare Earth Oxide | 30 - 65 | 68188-83-0 | N/A | 15 Mg/M3 | N/A | ||
| Calcium Oxide | 10 - 15 | 1305-78-8 | N/A | N/A | |||
| Strontium Oxide | 1 - 6 | 1314 - 11 - 0 | N/A | N/A | |||
| Alumina Silicate | 1 - 40 | 1332-58-7 | N/A | N/A | |||
| Fluorides | 4 - 10 | 68188-85-2 | N/A | 2.5 Mg/M3 | N/A | ||
| Silica | 2 | 14464-46-1 | N/A | 10 Mg/M3 | N/A |
| This material contains low levels of naturally occurring radioactive material (NORM) because of rare earth compounds | As Thorium - OSHA PEL: 0.25 mg/m3 . CERCLA reportable: No; SARA TITLE III: Section 302 extremely-No, Section 311/312 -Yes-Kaolin, Section 313 Toxic -No; RCRA Status-No; California Proposition 65-NA |
*REGULATED AS PER LISTS: OSHA 29 CFR 1910, SUBPART Z: ACGIH, HHS/N TP, & IAPC
|
SECTION III - PHYSICAL AND CHEMICAL DATA |
| BOILING POINT: N/A | MELTING POINT: | SPECIFIC GRAVITY (BULK): | |
| VAPOR PRESSURE: N/A | PERCENT VOLATILE BY VOL.: N/A | VAPOR DENSITY: N/A | |
| EVAPORATION RATE: N/A | SOLUBILITY IN WATER: NIL | SOLUBILITY IN ALCHOHOL: | |
| SOLUBILITY IN OTHER SOLVENTS: Will release hydrogen fluoride in contact with strong acids. | APPEARANCE & ODOR: odorless, buff powder | ||
|
SECTION IV - FIRE & EXPLOSION HAZARD DATA |
| FLASH POINT: N/A | METHOD USED: | FLAMMABLE LIMITS: |
| EXTINGUISHING MEDIA: N/A | ||
| SPECIAL FIRE FIGHTING PROCEDURES: The use of NIOSH respirators | ||
| EXPLOSION POTENTIAL: N/A | ||
|
SECTION V - HEALTH HAZARD DATA |
| PRIMARY ROUTE(S) OF ENTRY: | EFFECTS OF OVEREXPOSURE (EO) OR FIRST AID (FA): |
| INHALATION: Breathing dust may result in irritation of the nose & throat, prolonged exposure in excess of the TLV may result in serious inflammation of the lungs. | Remove from exposure, seek medical attention |
| INGESTION: Accidental ingestion of dusts may cause irritations of the digestive tract. | Do not give anything by mouth, do not leave victim unattended. If vomiting occurs, if lethargic, place victim on the left side with head down. Call doctor. |
| SKIN: Contact with broken skin may be severely irritating. | Remove contaminated clothing and flush effected areas with large quantities of water, Call doctor. |
| EYE: Contact with dust may be abrasive and irritating. | Contact with dusts may be abrasive and irritating and result in redness, burning, swelling & skin damage. |
| GENERAL FIRST AID:
(OTHER POTENTIAL HEALTH RISKS: The free silica present in sand is converted into amorphous state when melted into glass.) | |
|
SECTION VI - SPILL, LEAK & DISPOSAL |
|
|
SECTION VII - SPECIAL PROTECTION INFORMATION |
|
|
SECTION VIII - SPECIAL PRECAUTIONS & COMMENTS |
|
This Material Safety Data Sheet is offered solely for your information, consideration and investigation. It provides no warranties, either expressed or implied, and assumes no responsibility for the accuracy or completeness of the data contained herein.
