MATERIAL SAFETY DATA SHEET





PRODUCT NAME: MASTER BLEND THINSET GRAY                  HMIS CODES: H   F   R   P

PRODUCT CODE: 6042                                                   1   0   0   I



==================   SECTION I      -   MANUFACTURER IDENTIFICATION      =================



MANUFACTURER'S NAME: Custom Building Products, Inc.

ADDRESS: 6511 SALT LAKE AVE., BELL, CA.     90201

EMERGENCY PHONE: (323) 582-0846        INFORMATION PHONE: (323) 582-0846

DATE REVISED   : 06-05-03              NAME OF PREPARER : STEVE TAYLOR



==========   SECTION II   -   INGREDIENTS/SARA III INFORMATION      =========



                                     OCCUPATIONAL EXPOSURE     VAPOR

                                            LIMITS            PRESSURE    Wt.

COMPONENTS               CAS NUMBER OSHA PEL     ACGIH TLV   mm Hg @ TEMP % ----

-----------------------------------------------------------------------------

SILICON DIOXIDE;

SILICA, CRYSTALLINE      14808-60-7 10mg/M3      .3mg/M3          N/A     55

CALCIUM SALTS/

PORTLAND CEMENT                      5MG/M3DUST 10MG/M3           N/A     40

CALCIUM CARBONATE/

LIMESTONE                1317-65-3               10 mg/M3         N/A      5



*** No toxic chemical(s) subject to the reporting requirements of section 313

    of Title III and of 40 CFR 372 are present. ***









==============   SECTION III    -    PHYSICAL/CHEMICAL CHARACTERISTICS       =============



BOILING RANGE: N/A                      SPECIFIC GRAVITY (H2O=1):    2.6

VAPOR DENSITY: HEAVIER THAN AIR         EVAPORATION RATE: SLOWER THAN ETHER

SOLUBILITY IN WATER: SLIGHT

APPEARANCE AND ODOR: COLORED POWDER NO ODOR



================   SECTION IV    -      FIRE AND EXPLOSION HAZARD DATA    ===============



FLASH POINT: N/A

FLAMMABLE LIMITS IN AIR BY VOLUME - LOWER:         N/A     UPPER:   N/A

EXTINGUISHING MEDIA: NONE KNOWN



SPECIAL FIREFIGHTING PROCEDURES

NONE REQUIRED



UNUSUAL FIRE AND EXPLOSION HAZARDS

NONE REQUIRED

6042                       MATERIAL SAFETY DATA SHEET                     PAGE 2 OF 3





========================   SECTION V     -   REACTIVITY DATA   =======================



STABILITY: STABLE



CONDITIONS TO AVOID

NONE



INCOMPATIBILITY (MATERIALS TO AVOID)

NONE



HAZARDOUS DECOMPOSITION OR BYPRODUCTS

NONE



HAZARDOUS POLYMERIZATION: WILL NOT OCCUR

HAZARDOUS POLYMERIZATION CANNOT OCCUR





=====================   SECTION VI   -   HEALTH HAZARD DATA    ======================



INHALATION HEALTH RISKS AND SYMPTOMS OF EXPOSURE

CHRONIC: CEMENT DUST CAN CAUSE INFLAMMATION OF THE LINING TISSUE OF THE

INTERIOR OF THE NOSE AND INFLAMMATION OF THE EYE. HYPERSENSITIVE INDIVIDUALS

MAY DEVELOP AN ALLERGIC DERMATITUS (skin rash).





SKIN AND EYE CONTACT HEALTH RISKS AND SYMPTOMS OF EXPOSURE

ACUTE: WET CEMENT, ESPECIALLY AS AN INGREDIENT IN PLASTIC (unhardened)

CONCRETE, CAN DRY THE SKIN AND CAUSE ALKALI BURNS. CEMENT DUST CAN IRRITATE

THE EYES AND UPPER RESPIRATORY SYSTEM.



SKIN ABSORPTION HEALTH RISKS AND SYMPTOMS OF EXPOSURE

NONE



INGESTION HEALTH RISKS AND SYMPTOMS OF EXPOSURE

NONE



HEALTH HAZARDS (ACUTE AND CHRONIC)

THIS PRODUCT CONTAINS ONE OR MORE CHEMICALS KNOWN TO THE STATE OF CALIFORNIA

TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM. THE STATE OF

CALIFORNIA (PROP. 65) REQUIRES THE ABOVE WARNING IN THE ABSENCE OF DEFINITIVE

TESTING TO PROVE THAT THE DEFINED RISKS DO NOT EXIST. WE BELIEVE THIS PRODUCT

COMPLIES WITH ALL OTHER APPLICABLE STATE AND FEDERAL LAWS AND REGULATIONS

GOVERNING MANUFACTURE, DISTRIBUTION AND INTENDED USE.

CARCINOGENICITY: NTP? YES IARC MONOGRAPHS? YES OSHA REGULATED? YES

THERE IS SUFFICIENT EVIDENCE FOR THE CARCINOGENICITY OF CRYSTALLINE

SILICA TO EXPERIMENTAL ANIMALS AND HUMANS.



MEDICAL CONDITIONS GENERALLY AGGRAVATED BY EXPOSURE

HYPERSENSITIVE INDIVIDUALS MAY DEVELOP SKIN RASH.



EMERGENCY AND FIRST AID PROCEDURES

EYE CONTACT: IRRIGATE EYES WITH WATER; CONSULT PHYSICIAN IMMEDIATELY.

SKIN CONTACT: WASH EXPOSED AREAS WITH SOAP AND WATER IMMEDIATELY.

IHALED: WEAR APPROVED RESPIRATOR IN DUSTY ENVIRONMENT.

6042                         MATERIAL SAFETY DATA SHEET                    PAGE 3 OF 3





===========   SECTION VII   -   PRECAUTIONS FOR SAFE HANDLING AND USE     ============



STEPS TO BE TAKEN IN CASE MATERIAL IS RELEASED OR SPILLED

CLEAN-UP USING DRY METHODS THAT DO NOT DISPERSE DUST INTO THE AIR.

AVOID BREATHING THE DUST. EMERGENCY PROCEDURES ARE NOT REQUIRED.



WASTE DISPOSAL METHOD

CAN BE TREATED AS A COMMON WASTE OR RETURNED TO THE CONTAINER FOR LATTER USE

IF IT IS NOT CONTAMINATED.



PRECAUTIONS TO BE TAKEN IN HANDLING AND STORING

NONE



OTHER PRECAUTIONS

NONE



=====================    SECTION VIII   -   CONTROL MEASURES    ======================



RESPIRATORY PROTECTION

APPROVED NIOSH RESPIRATOR.



VENTILATION

AVOID GENERATING DUST.



PROTECTIVE GLOVES

IMPERVIOUS GLOVES SHOULD BE WORN TO PREVENT SKIN CONTACT.



EYE PROTECTION

THE USE OF TIGHT GOGGLES ARE RECOMMENDED TO PREVENT EYE IRRITATION FROM

CEMENT DUST.



OTHER PROTECTIVE CLOTHING OR EQUIPMENT

THE USE OF BARRIER CREAMS OR GLOVES IMPERVIOUS BOOTS AND CLOTHING TO PROTECT

THE SKIN FROM CONTACT WITH WET CEMENT.



WORK/HYGIENIC PRACTICES

GOOD HOUSEKEEPING PROCEDURES SHOULD BE FOLLOWED AT ALL TIMES.





=========================    SECTION IX     -   DISCLAIMER   ==========================



DISCLAIMER

THE INFORMATION PRESENTED HERE IS BELIEVED TO BE ACCURATE BUT IS NOT

WARRANTED TO BE, WHETHER ORIGINATING WITH THE COMPANY OR NOT. RECIPIENTS ARE

ADVISED TO CONFIRM IN ADVANCE OF NEED, THAT THE INFORMATION IS CURRENT,

APPLICABLE, AND SUITABLE TO THEIR CIRCUMSTANCES.