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Historic Preservation - Technical Procedures

Spectitle:

Cleaning And Polishing Bronze Elevator Doors And Cabs

Procedure code:

0501030R

Source:

Gsa Office - 4P2

Division:

Metals

Section:

Metal Materials

Last Modified:

02/24/2012

Details:

Cleaning And Polishing Bronze Elevator Doors And Cabs



CLEANING AND POLISHING BRONZE ELEVATOR DOORS AND CABS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on the general cleaning
         and polishing of bronze elevator doors and cab walls.
         More detailed guidance is provided in several other
         bronze cleaning procedures.  These have been noted, when
         applicable, and should be referenced in conjunction with
         this procedure.

    B.   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).


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   J.A. Wright & Co.
         62 Dunbar Street
         Keene, NH  03431
         603/352-2625

2.02 MATERIALS

    A.   Lemon oil

    B.   Mineral oil

    C.   Wax (silicone or furniture wax)

    D.   Liquid brass cleaner (contain a very fine abrasive) such
         as "Brasso", "Noxon", "Golden Glow", "Wright's Brass
         Cleaner and Polish" (J.A. Wright & Co.), or approved
         equal.

         NOTE:  THESE WORK WELL ON TARNISH, BUT CAN LEAVE BEHIND
         A RESIDUE THAT WILL BUILD UP IN JOINTS OR CARVED AREAS IF
         NOT COMPLETELY REMOVED.

    E.   Mild detergent

    F.   Clean, soft cloths

    G.   Clean, potable water

2.03 EQUIPMENT

    A.   Scotchbrite Type "A"


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Ensure that the elevator is parked in place before
              proceeding with cleaning and polishing operations.

         2.   Keep elevator doors open at all times, except when
              cleaning the inside of the cab doors; make sure the
              elevator fan is turned on and remains running
              throughout the work operations.

         3.   Cover and protect floor under work area using
              tarpaulins or towels.  

         4.   Take care not to spill fluids or sprays on elevator
              push buttons, key switches or door reopening
              sensors.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   For Natural Finish:

         1.   Cleaning:  Remove dirt and finger marks from the
              surface by wiping weekly with a light coat of wax
              on a clean, soft cloth.  Lemon oil or mineral oil
              may also be used.

         2.   Polishing:

              a.   Rub the surfaces lightly using a scotchbrite
                   pad saturated with lemon oil or mineral oil.
                   Rub in the direction of the grain or sanding
                   lines.

              b.   Wipe the surface dry with a clean, soft cloth.
                   To retard oxidation, treat the cloth with
                   either wax, lemon oil or mineral oil before
                   wiping the surface dry.

         3.   See also 05010-01-P for guidance on cleaning and
              polishing bronze.

    B.   For Mirror Finish:

         1.   Cleaning: Remove adhesive residue or dirt by wiping
              the surface with a clean, soft cloth treated with a
              bronze mirror finish cleaner.

         2.   Polishing: Polish the surface using a cloth treated
              with liquid brass cleaner.  DO NOT USE ABRASIVE
              POLISHES ON MIRROR FINISH BRONZE.  THEY MAY
              PERMANENTLY MAR THE SURFACE FINISH.

         3.   See also 05010-03-P, 05010-10-P and 05010-12-P for
              guidance on cleaning, polishing and protecting
              brass finishes.

    C.   For Statuary Finish: (Oxidized bronze with a protective
         finish such as "Perma-cote #62").  NOTE: This type of
         coating may last anywhere from six months to two years,
         depending on its location relative to amount of public
         contact.

         1.   Cleaning:  

              a.   Dust weekly with a clean soft cloth.

              b.   For stubborn dirt, clean periodically with a
                   damp rag soaked in a mild soap and warm water.
                   Always wipe in the direction of the grain or
                   finish sanding lines.

         2.   See also 05010-22-R for guidance on cleaning and
              oiling statuary bronze finishes.

    D.   For Lacquer Finish:

         1.   Cleaning: Clean as above for statuary finish.

         2.   If lacquer coating becomes oxidized, it will need
              to be replaced.  See 05010-11-R for guidance on
              repairing a scratched or worn Incralac coating on
              bronze.

         3.   See also 05010-24-R for guidance on refinishing
              bronze features.

                         END OF SECTION