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Marble Chips |
Marble Chips: Marble
has been defined as a metamorphic rock formed by
the recrystallization of limestone. However, in
recent decades, marble has been redefined to include
all calcareous rocks capable of taking a polish
(such as onyx, travertine, and attractive serpentine
rocks). Marble is quarried, selected to avoid off
color or contaminated material, crushed and sized
to yield marble chips for Terrazzo. Excellent domestic
and imported marble chips are available for use
in terrazzo in a wide range of colors and can be
combined in infinite varieties to create color
harmonies of every description.
Marble Chip Sizes: Marble
chips are graded by number according to size
in accordance with standards adopted by producers
as follows: |
| Size
# |
Passes
Screen |
Retained
on Screen |
| Size # 0 |
1/8 inch |
1/16 inch |
| Size # 1 |
1/4 inch |
1/8 inch |
| Size # 2 |
3/8 inch |
1/4 inch |
| Size # 3 |
1/2 inch |
3/8 inch |
| Size # 4 |
5/8 inch |
1/2 inch |
| Size # 5 |
3/4 inch |
5/8 inch |
| Size # 6 |
7/8 inch |
3/4 inch |
| Size # 7 |
1 inch |
7/8 inch |
| Size # 8 |
1 1/8 inches |
1 inch |
|
Customary Sizes for Toppings:
- Standard: No. 1 and 2.
- Intermediate: No. 1, 2, 3, and 4.
- Venetian: No. 1, 2, 3, 4, and 5; and/or
6, 7, and 8.
- Resinous: (1/4 inch thickness) No. 1 and
0.
- Resinous: (3/8 inch thickness) No. 1,
2, and 0.
NOTE: Marble chip quarries
normally produce 0, 1, and 2 as separate sizes,
Larger sizes are frequently grouped; for example
#3-4 mixed and #7-8 mixed, and #4-7 mixed. #00
chips (1/16 to 1/32 inch size) are available
for use in industrial floors.
Selecting Marble
Chips:It is highly desirable that
color combinations be designated by NTMA
plate numbers (NTMA Color Plates). In the
absence of NTMA color plates, it is important
that the size and color combinations be
shown due to price differentials. |
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