EMS CATALOG NO:   14381,14383

                                     EMS PRODUCT:      LR White Resin

                                     DATE:             04/21/2001

                                     PAGE NUMBER:      One of 3





                        MATERIAL SAFETY DATA SHEET



    The information contained herein is based on data considered

    accurate. However, no warranty is expressed or implied

    regarding the accuracy of these data or the results to be

    obtained from the use thereof.



    Electron Microscopy Sciences assumes no responsibility for

    personal injury or property damage to vendees, users or

    third parties caused by the material. Such vendees or users

    assume all risks associated with the use of the material.





ELECTRON MICROSCOPY SCIENCES

321 MORRIS ROAD

P.O. BOX 251

FORT WASHINGTON, PA 19034          24 HOUR EMERGENCY PHONE NUMBER

(215) 646-1566                     CHEMTREC: (800) 424-9300

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               FOR PRODUCT AND SALES INFORMATION

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    CONTACT ELECTRON MICROSCOPY SCIENCES OFFICE ABOVE.



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                      PRODUCT IDENTIFICATION

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PRODUCT NAME:             LR White



CHEMICAL COMPOSITION:



     80%   polyhydroxy substituted bisphenol A dimethacrylate resin

     19.6% C12 methacrylate ester

      0.9% benzoyl peroxide

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                         TOXIC DATA

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    Resin based on resins used in dental fillings. The resin is of

    very low viscosity and designed to penetrate biological tissue

    being an embedding resin. Hence care should be taken to minimize







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    skin contact. This is especially true if there is a previous

    history of allergy to methacrylates.







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                             HAZARDS

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    The resin is combustible.   The flash point of the resin

    exceeds 120oC.



    If excess catalyst is added a high exotherm may result;

    this is only a risk if the container holding the mixture

    is not vented.



    The very small amount of peroxide does not present a hazard,

    though the resin should be kept cool (4oC) to prevent

    premature polymerization.



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                    RECOMMENDATIONS FOR SAFE HANDLING

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    Avoid unnecessary contact with skin; wash hands after

    use with soap and warm water. Apply a moisturizing

    cream after use if large amounts have been spilled on

    the skin.



     Avoid all contact with eyes. If resin gets into the

     eyes wash the eyes gently with distilled water for ten

     minutes and have eyes examined by a qualified doctor,

     preferably an eye specialist.

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                         DISPOSAL

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    Dispose of resin and catalyst by combining the two in a

    well vented container, i.e. a bucket. To polymerize the

    resin safely adds 2.5% di-methyl p. toluidine. The resin

    will then cure with a little fuming as it exotherms and

    should be placed in a fume cupboard or outside while this

    occurs. The cool resin is harmless and may be disposed of

    with other non toxic materials.









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                         ADDITIONAL INFORMATION





Health and Fire Ratings are not known at this time.









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