Cleaning And Oiling Statuary Bronze Surfaces
- Procedure code:
- National Capitol Region Specifications
- Metal Materials
- Last Modified:
CLEANING AND OILING STATUARY BRONZE SURFACES
A. This procedure includes guidance on cleaning and oiling
statuary bronze surfaces. For additional guidance on
cleaning, polishing and protecting bronze, see 05010-01-
R, 05010-24-R, 05010-06-P, 05010-07-P and 05010-04-P.
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
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).
C. Cleaning and refinishing bronze is highly specialized and
should be conducted under the supervision of a metals
conservator. All chemicals and their application should
be approved prior to use by the metals conservator to
ensure protection of historic metals.
A. E.I. duPont de Nemours & Co., Inc.
1007 Market Street
Wilmington, DE 19898
302/774-1000 or 800/441-7515
B. Atlantic Refining Company
C. 3M Consumer Products Group
St. Paul, MN 55133-3053
612/737-6501 or 800/364-3577
A. Standard Solvent:
1. A mixture of 75% toluene, 24% acetone, and 1% butyl
acetate (available from chemical supply firms).
2. As an alternate, solvents normally used for
thinning nitrocellulose lacquers, such as "DuPont
Lacquer Solvent No. 3661-S" (for use in mid-
temperatures, 50-80 F) (E.I. duPont de Nemours &
Co., Inc.), or approved equal.
B. Mild Soap: Ivory or a mild detergent with pH of
C. Oil: "Lemon Grass Oil, Native E.I.," with a high grade
distillate paraffin oil of c. 100 second viscosity, with
a flash point above 350 F, containing napthenes but free
of cracked stock such as kerosene, mixed 5 oz. "Lemon
Grass Oil" per gallon of paraffin oil, "Topaz B"
(Atlantic Refining Company).
D. Abrasive: Silicon carbide abrasive pads such as "Scotch-
Brite" (3M Company) or standard commercially available
pumice stone; or stainless steel wool. Do not use steel
wool, which may promote discoloration of the bronze.
E. Oxidizing Agent: Aluminum chloride or liquid sulphur.
F. Cloth: Clean cotton waste.
A. Protection: Protect all masonry surfaces immediately
adjacent to or below the area to be cleaned by covering
with polyethylene sheeting.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Wash the surfaces with mild soap and a soft cloth rubbing
with the grain of the metal. Clean surface dirt and
grease only, do not rub down to bright metal. Rinse
thoroughly with clear water.
B. Remove all stains, oxides, sulfides or corrosion products
with abrasive and standard solvent. Refinish areas of
bright metal work with oxidizing agent, to match the
existing cleaned statuary finish.
C. Remove cleaning residue with two applications of a
standard solvent using a soft cloth. Apply oil to the
surface, rubbing with a soft clean cloth, followed by a
brisk rubbing with a second clean soft cloth to remove
all excess oil. On irregular, molded surfaces, a soft
fiber brush may be used as an applicator.
END OF SECTION