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Historic Preservation - Technical Procedures

Spectitle:

Removing Adhesives From Marble

Procedure code:

0445523R

Source:

Stain Removal Guide For Stone - F. M. Hueston

Division:

Masonry

Section:

Marble

Last Modified:

07/30/2013

Details:

Removing Adhesives From Marble



REMOVING ADHESIVES FROM MARBLE


THE CLEANING OR REMOVAL OF STAINS FROM STONE MAY INVOLVE THE USE OF
LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON ADJACENT
MATERIAL, DISCOLOR THE STONE OR DRIVE THE STAINS DEEPER INTO POROUS
STONES.  USE THE PRODUCTS AND TECHNIQUES DESCRIBED HERE ONLY FOR
THE COMBINATIONS OF DIRT/STAIN AND STONE SPECIFIED.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing the sticky
         adhesive residue left behind after removing signage or
         other objects which have been applied directly to the
         marble surface.  

    B.   Surface-mounted signage is a common problem in GSA
         buildings, both on the exterior and in public lobbies.
         The signage is often applied directly to the stone
         surface with an adhesive.  This solution for needed
         signage is unsightly, and reversal is often difficult,
         leaving the surface discolored and stained.  Free-
         standing signage is usually the preferred solution, when
         possible.

    C.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).

    D.   For additional information on poulticing, see 04455-02-R.

    E.   For general information on the characteristics, uses and
         problems associated with marble, see 04455-01-S.


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  The grade of
    purity of common name substances, however, is usually adequate
    for stain removal work, and these products should be purchased
    when available, as they tend to be less expensive.  Common
    names are indicated below by an asterisk (*).

    A.   Acetone (C3H6O):

         1.   A volatile fragrant flammable liquid ketone used
              chiefly as a solvent and in organic synthesis.

         2.   Other chemical or common names include Dimethyl
              ketone; Propanone

         3.   Potential Hazards:  VOLATILE AND FLAMMABLE SOLVENT

         4.   Available from chemical supply house or hardware
              store.
    B.   Mineral Spirits:

         1.   A petroleum distillate that is used especially as a
              paint or varnish thinner.

         2.   Other chemical or common names include Benzine*
              (not Benzene); Naphtha*; Petroleum spirits*;
              Solvent naphtha*.

         3.   Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Safety Precautions:

              a.   AVOID REPEATED OR PROLONGED SKIN CONTACT.

              b.   ALWAYS wear rubber gloves when handling
                   mineral spirits.

              c.   If any chemical is splashed onto the skin,
                   wash immediately with soap and water.

         5.   Available from construction specialties
              distributor, hardware store, paint store, or
              printer's supply distributor.

    C.   Toluene:(C7H8):

         1.   A liquid, aromatic hydrocarbon that resembles
              benzene but is less volatile, flammable and toxic;
              Is produced commercially from light oils from coke-
              oven gas and coal tar and from petroleum, and is
              used as a solvent, in organic synthesis and an
              antiknock agent for gasoline.

         2.   Other chemical or common names include Toluol.

         3.    Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Available from chemical supply house, hardware
              store, paint store or printer's supply distributor.

    D.   Xylene:(C8H10):

         1.   Any of three toxic, flammable, oily, isomeric,
              aromatic hydrocarbons that are di-methyl homologues
              of benzene and are obtained from wood tar, coal
              tar, or petroleum distillates;  Also a mixture of
              xylenes and ethyl-benzene used chiefly as a
              solvent.

         2.   Other chemical or common names include Xylol; P-
              xylene; 1,4-dimethyl benzene.

         3.    Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Available from chemical supply house, hardware
              store, paint store or printer's supply distributor.

    E.   Methylene Chloride:

         NOTE:  THIS CHEMICAL IS BANNED IN SOME STATES SUCH AS
         CALIFORNIA.  REGULATORY INFORMATION AS WELL AS
         ALTERNATIVE OR EQUIVALENT CHEMICALS MAY BE REQUESTED FROM
         THE ENVIRONMENTAL PROTECTION AGENCY (EPA) REGIONAL OFFICE
         AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.

         1.   Other chemical or common names include
              Dichloromethane; Methylene bichloride; Methylene
              dichloride.

         2.   Potential Hazards:  TOXIC.

         3.   Available from chemical supply house, dry cleaning
              supply distributor, paint store, photographic
              supply distributor (not camera shop), or printer's
              supply distributor.

    F.   White absorbent material (molding plaster, untreated
         white flour, white tissue, paper towels, powdered chalk,
         talc, fullers earth or laundry whiting)

    G.   Mineral water

    H.   Plastic sheeting

    I.   Clean dry towels for blotting the area after treatment

2.02 EQUIPMENT

    A.   Razor blade

    B.   Glass or ceramic container for mixing the solution

    C.   Wooden utensil for stirring the ingredients

    D.   Wood or plastic spatula

    E.   Masking tape


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Verification of Conditions:  Examine the marble surface
         CAREFULLY to determine the cause of staining before
         proceeding with any cleaning operation.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Carefully remove any sticky residue using a sharp razor
         blade.

    B.   Wipe remaining residue with a clean, soft rag saturated
         with acetone.  Continue to wipe the area until all of the
         residue has been removed.

    C.   If the surface is stained or discolored, prepare and
         apply a poultice:

         NOTE:  Test the different solvents to see which is the
         most effective on the stain.  ALWAYS TEST A SMALL AREA
         FIRST, AND OBTAIN APPROVAL FROM RHPO BEFORE PROCEEDING
         WITH THE TREATMENT OF LARGER AREAS.
         1.   Rinse the area to be treated with mineral water.

         2.   Thoroughly moisten the stained surface with the
              solvent.  Be sure to dampen well beyond the stain.

    D.   Mix one of the solvents (Mineral Spirits, Toluene, Xylene
         or Methylene Chloride) with the white absorbent material
         to form a paste the consistency of oatmeal or cake icing.
         (Approximately one pound of paste is needed for every
         square foot of surface area to be treated.)

    E.   Using a wooden or plastic spatula, apply the paste to the
         stained surface in layers no more than 1/4 inch thick.
         The poultice should extend well beyond the stain to
         prevent forcing the stain into previously clean stone.

    F.   Check the coating for air pockets or voids.

    G.   Cover the poultice with plastic sheeting and seal with
         masking tape.

    H.   Let set for 48 hours (unless otherwise specified).

    I.   After set period, dampen the poultice with mineral water.

    J.   Remove the poultice with a wooden or plastic spatula to
         avoid scratching the surface.

    K.   Again, thoroughly rinse the cleaned area with mineral
         water, blot with clean towels and allow the surface to
         dry.

    L.   Once the surface has dried completely, check for
         remaining stains and repeat the treatment if necessary.

                         END OF SECTION
 


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