GarCo Manufacturing Co., Inc.

A Material Solutions Company

Glass Yarn Nomenclature

U.S. SYSTEM

E C G 75 1/2 2.8 S
Glass Comp Filament Type Filament Diameter Yield Strand Ratio Turns Twist

METRIC SYSTEM

E C 9 66 1×2 S 112
Glass Comp Filament Type Filament Diameter Yield Strand Ratio Twist Turns

Glass Composition:

E = Electrical
C = Chemical
S = High Strength

Filament Type:

C = Continuous
S = Staple
T = Texturized

Filament Diameter:

Filament Designation Average Diameter Range
US Units SI Units (µ) Inches Micrometers (µ)
BC 4 0.00014 to 0.00017 3.60 to 4.40
D 5 0.00020 to 0.000249 5.08 to 6.00
DE 6 0.000225 to 0.000274 5.72 to 6.00
E 7 0.00025 to 0.000299 6.35 to 7.61
F 8 0.00030 to 0.000349 7.62 to 8.86
G 9 0.00035 to 0.000399 8.89 to 10.15
H 11 0.00040 to 0.000449 10.16 to 11.42
J 12 0.00045 to 0.000499 11.43 to 12.69
K 13 0.00050 to 0.000549 12.70 to 13.96
L 14 0.00055 to 0.000599 13.97 to 15.23
M 16 0.00060 to 0.000649 15.24 to 16.50
N 17 0.00065 to 0.000699 16.51 to 17.77
P 18 0.00070 to 0.000749 17.78 to 19.04
Q 20 0.00075 to 0.000799 19.05 to 20.31
R 21 0.00080 to 0.000849 20.32 to 21.58
S 22 0.00085 to 0.000899 21.59 to 22.85
T 23 0.00090 to 0.000949 22.86 to 24.12
U 24 0.00095 to 0.000999 24.13 to 25.40

Yield Designation:

Filament Designation Nominal Yarn Number (Strand Count)
US Units SI Units (µ) 100-yd Cuts/Lb Yds/Lb (Bare Glass) TEX
(Grams/ 1000-meters)
Approx. number of Filaments
D 5 1800 180,000 2.75 51
D 5 900 90,000 5.5 102
D 5 450 45,000 11 204
D 5 225 22,500 22 408
E 7 225 22,500 22 204
BC 4 150 15,000 33 1064
DE 6 150 15,000 33 408
G 9 150 15,000 33 408
E 7 110 11,000 45 408
H 11 110 11,000 45 204
DE 6 100 10,000 50 612
C 4.5 75 7,500 66 1632
DE 6 75 7,500 66 816
G 9 75 7,500 66 408
K 13 75 7,500 66 204
H 11 55 5,500 90 408
DE 6 50 5,000 99 1224
DE 6 37 3,700 134 1632
G 9 37 3,700 134 816
K 13 37 3,700 134 408
H 11 25 2,500 198 816
G 9 19 1,900 257 1632
K 13 18 1,800 275 816
H 11 18 1,800 275 1224
H 11 15 1,500 330 1632

Strand Ratio:
The ratio of the number of single strands twisted into continuous filament ends to the number of twisted strands plied together.

Turns:
Number of turns per unit of measure in the twist of the final yarn. Inch is the unit of measure in the US System and meter is the unit of measure in the Metric System.

Direction of Twist:

S-Twist The strands assume an ascending right to left configuration as in the central portion of the letter “S”
Z-Twist The strands assume an ascending left to right configuration as in the central portion of the letter “Z”

Strand Twist:

Turns per Inch (TPI) Turns per Meter (TPM)
0.5 20
0.7 28
1.0 40
1.3 52
2.0 80
2.8 112
3.0 120
3.5 140
3.8 152
4.0 160
5.0 200
7.0 280
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