Temporary Patching Of Chips And Cracks In Window Glazing

Procedure code:
880002S
Source:
Hspg Prepared For Nps - Sero
Division:
Doors and Windows
Section:
Glass & Glazing
Last Modified:
11/19/2014


TEMPORARY PATCHING OF CHIPS AND CRACKS IN WINDOW GLAZING


PART 1---GENERAL

1.01 SUMMARY

A. This procedure includes guidance on temporarily repairing
chipped or cracked glass by patching with an adhesive.

B. This treatment is simple and inexpensive. Although it
will not remove the crack, it permits the safe use of
cracked window panes until suitable replacements can be
found or where it is desirable to permanently save the
glass in situ. For guidance on replacing glazing, see
08800-01-R "Replacing Broken Glass in Wood and Metal
Windows".

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).

1.02 SYSTEM DESCRIPTION

A. A window glass is in proper condition when it is set
securely and tightly into the window frame, is properly
caulked, and is not scratched, cracked, or broken.

1.03 SEQUENCING AND SCHEDULING

A. Coordination of Work: The coordination of glass
repairing/replacing with other proposed work on the
windows must be considered. For example, if paint
removal, cleaning, or repairing is anticipated on window
elements (frame, sash, trim, hardware, lintel, sill,
etc.), it is generally better to postpone glazing work
until after the completion of these activities.


PART 2---PRODUCTS

2.01 MANUFACTURERS/SUPPLIERS

A. Glass adhesives:

1. Conservation Resources International seACME Chemical & Insulation Co., Div. Allied
www.conservationresources.com Products Corp.
Epo-Tek 301

2. Palmer Opticon Chemical
www.mirro-mastic.com.O. Box 2445
Mirro-Mastic


2.02 MATERIALS

A. Glass adhesive(s): (see manufacturers above; review current product literature to determine if the product is appropriate, or approved
equal).

1. Should be viscous enough to flow into the cracks

2. Should have a similar refractive index to that of
the glass

3. Should be non-yellowing and reversible

B. Solvents:

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 (*).

CAUTION: THESE SOLVENTS ARE EXTREMELY FLAMMABLE, AND
THEY IRRITATE THE SKIN. STORE THE SOLVENTS IN FIRE-SAFE
CONTAINERS, AND WEAR RUBBER GLOVES AND GOGGLES WHEN
WORKING WITH THE SOLVENT.

1. Methyl Ketone:

-OR-

2. Methyl Isobutyl Ketone:

a. Other chemical or common names include
Asymmetric ethyl methyl acetone; 3-methyl-2-
pentanone; Secondary butylmethyl ketone;
MIBK*.

b. Potential Hazards: TOXIC AND FLAMMABLE.

c. Available from chemical supply house, hardware
store or paint store.

-OR-

3. Acetone (C3H6O):

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

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

c. Potential Hazards: VOLATILE AND FLAMMABLE
SOLVENT

d. Available from chemical supply house or
hardware store.

2.03 EQUIPMENT

A. Syringe or eye dropper

B. Heavy gloves, goggles and other protective gear

C. No. 6 natural fiber paint brush

D. Scalpel


PART 3---EXECUTION

3.01 EXAMINATION

A. Before proceeding with steps to repair glazing, first
determine the cause and extent of the problem: Check for
cracked, broken, chipped, or otherwise damaged glass.

3.02 ERECTION/INSTALLATION/APPLICATION

A. Remove dust/dirt from the crack by gently blowing a
stream of air into the crack.

B. Flush the crack with a solvent applied by syringe or eye
dropper.

C. Hold the cracked glass together with Scotch tape placed
on one side of the crack.

D. Apply adhesive with a number 6 natural fiber paint brush.

E. Allow to dry; remove scotch tape and excess adhesive with
a scalpel.

F. Normal glass cleaning operations should not affect the
bond.


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