FRP grade and quality
ａ）Comparison by grade
By selecting reinforcing materials and molding methods, we have made it possible to manufacture a wide variety of products, from products with low costs to products with high functionality.
| Grade | Symbol | Contents | Molding method |
| Type 1 | FRP1 | An important strength part that requires the highest strength and rigidity in one direction. | Press Filament winding |
| Type 2 | FRP2 | An important strength part that requires the highest degree of strength and rigidity. | |
| Type 3 | FRP3 | An important strength part that requires a high degree of strength and rigidity. | |
| Type 4 | FRP4 | Strength part that requires medium strength and rigidity. | Wet layup (Hand layup) |
| Type 5 | FRP5 | A part whose strength and rigidity can be slightly disliked for economic reasons. | |
| Type 6 | FRP6 | A part that does not require much strength and rigidity. | |
| Type 7 | FRP7 | A part whose structural characteristics are not important. |
ｂ）Standard example of reinforcing material composition for each grade
| Grade | Symbol | Contents |
| Type 1 | FRP1 | Roving (FW) |
| Type 2 | FRP2 | Satin cloth (pressurized) |
| Type 3 | FRP3 | Satin cloth (contact pressure), plain cloth (pressurized) |
| Type 4 | FRP4 | Satin cloth (contact pressure), plain cloth + roping cloth (contact pressure) |
| Type 5 | FRP5 | Plain cloth + mat (contact pressure) |
| Type 6 | FRP6 | Mat (contact pressure) |
| Type 7 | FRP7 | Mat (contact pressure) |
ｃ）Characteristics of material mechanics
| Charactaristics of material mechanics |
Test conditions |
Specific gravity | ||||||
| FRP1 | FRP2 | FRP3 | FRP4 | FRP5 | FRP6 | FRP7 | ||
| Flexural strength （kg/㎟） |
Standard Moisture |
67more than 60more than |
35more than 31more than |
26more than 23more than |
22more than 19more than |
16more than 14more than |
13more than 11more than |
11more than 8more than |
| Flexural modulus （kg/㎟） |
Standard Moisture |
3600more than 3240more than |
1760more than 1620more than |
1410more than 1270more than |
1020more than 880more than |
770 more than 670more than |
600 more than 540more than |
490 more than 390more than |
| Tensile strength （kg/㎟） |
Standard Moisture |
78more than 78more than |
26more than 26more than |
20more than 20more than |
14more than 14more than |
10more than 10more than |
6more than 6more than |
5more than 5more than |
| Compressive strength （kg/㎟） |
Standard Moisture |
35more than 24more than |
23more than 20more than |
18more than 16more than |
15more than 14more than |
12more than 11more than |
11more than 10more than |
11more than 9more than |
| Void content（%） Resin content （wt%） |
– – |
1.0less than 25less than |
1.5less than 43less than |
2.0less than 50less than |
3.0less than 57less than |
4.0less than 65less than |
5.0less than 75less than |
5.0less than 80less than |