Glass Yarn Nomenclature
U.S. SYSTEM
METRIC SYSTEM
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 |
