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INTERNATIONAL
STANDARD GUIDE
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GLZ-2001
Addopted-2000
Standards-2001
Revised-0000
Revised-0000 |
FACTS
publishes this document as a public service. Its use
is voluntary, and all results obtained by its use must
be entirely the responsibility of the user. This document
is subject to revision, change and/or withdrawal at
any time. ©
FACTS 2000
1.00
Purpose
1.01
To establish a standard quality guide for those
non-visual glazing characteristics not easily recognized
by the end user.
1.02
To establish the minimum percentage for any glazing
glass or acrylic to be recognized as having increased
UV blocking.
1.03
To establish a minimum percentage for any glazing
glass or acrylic to be recognized as having increased
anti-reflective qualities.
2.00
Scope
2.01
This guide covers only those qualities of Anti-reflectivity
and UV blacking not easily determined when selecting
a glazing material. No other glass qualities such as
thickness, clarity or composition are addressed as they
are considered to be easily recognized.
2.02
This guide addresses the minimum percentages
for UV Blocking and Anti-reflective.
3.00
Terminology
3.01
FACTS Standard Terminology, (latest chapter or
revision) and Random House Webster's Dictionary 1999.
4.02
Terminology Format-The following words are defined
to clarify the importance of the articles, sections
or formats, and to identify those that are mandatory.
"Shall"
is used to indicate that a provision is mandatory.
"Should"
is used to indicate that a provision is not mandatory,
but recommended as good practice.
"May"
is used to indicate that a provision is optional.
4.03
"Consensus"
majority of opinion.
4.04
"Glazing"
includes both glass plastic.
4.05
Acrylic Sheet
A solid (monolithic), thermoplastic sheet made
from acrylic polymer for the picture framing and museum
industries.
4.06
Anti-reflection
The phenomena of reducing light reflection on
the surface of a material and increasing its transmission
at the same time.
4.08
UV Blocking Glass and Acrylic
Also called UV Absorbing, UV Filtering, UV
Protective
The ability of a material to block or not transmit
UV light.
5.00
Normal Glazing Materials
5.01
UV Blocking qualities normal glazing (glass or
acrylic) glass (soda-lime float glass), in thicknesses
normally used for picture framing (2.0 - 3.0 mm) blocks
about 40 percent of the UV light in the 300 to 400 nm
range. Acrylic, in the same thicknesses, blocks about
66 percent of the UV. To be consided to have UV blocking
qualities the percentage must be increased above these
base amounts.
5.02
Anti-reflective qualities normal glazing (glass
or acrylic) glass (soda-lime float glass), in thicknesses
normally used for picture framing (2.0 - 3.0 mm) reflects
about 8% of visible light and, transmit from 89 to 92%.
To be consided to have Anti-reflective qualities the
percentage must be reduced below these base amounts.
6.00
Requirements
for UV Blocking
6.01
For any glass or acrylic product to meet the
requirements for the definition of a UV Blocking Glazing,
it must be treated or modified in such a way that it
blocks or absorbs more UV light than the untreated substrate
material. This increased UV Blocking must be greater
than collective glass, acrylic base of 70 percent UV
blocking. The greater the percentage of UV blocking,
the more effective the product will be.
6.02
The requirement for any glazing to be recognized
as having significant UV
Blocking Qualities shall be no less than 70 percent
of all light in the 300 to 400 nanometer range.
7.00
Requirements
for UV Anti-reflective
7.01
For any glass or acrylic product to meet the
requirements of the definition of Anti-reflective glazing,
the reflection must be reduced to a value less than
the base value and the transmission must be increased
to a value higher than that for the untreated substrate
material. This reduction must be less than the collective
glass, acrylic base value of 8 percent, The lower the
percentage of
reflection and the higher the percent transmission,
the more effective the product will be.
7.02
The requirement for any glazing to be recognized
as having significant Anti-reflective
Qualities shall be no greater than 7 percent.
8.00
Test Methods
8.01
UV Blocking Glass or Acrylic 300 to 400 nanometer
range. (ASTM standard to be included)
8.02
Anti-reflective Glass or Acrylic ¾Reduced
reflection, increased transmission (ASTM standard to
be included))
9.00
Packaging & Identification Marking
9.01
General Labeling¾Each
package of glass or acrylic should bear a label, affixed
by the manufacturer, giving the manufacturer's name
or trademark, the type of glass, nominal thickness,
and place of manufacture.
9.02
Standard Labeling ¾Each
package of glass or acrylic representing increased UV
Blocking or Anti-reflective qualities should state that
it meets or exceeds this standard and include the UV
blocking percentage number and/or anti-reflective index
number.
10.00
Inspection
10.01
It is the responsibility of the purchaser to
examine all shipments of glazing, and determine whether
it complies with the purchase order and/or the above-suggested
requirements.
11.00
Referenced Documents
11.01
Facts
Glazing Terminology 2000
12.01
FACTS takes no position respecting the validity
of any patent rights asserted in connection with any
item mentioned in this standard. Users of this standard
are expressly advised that determination of the validity
of any such patent rights, and the risk of Infringement
of such rights, are entirely their own responsibility.
12.02 All
FACTS standards are subject to revision at anytime by
their responsible technical committee and must be reviewed
every five years.
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