Direct Roving

Basalt Continuous Filaments under the name of Basfiber®

General Description:

Roving is a bundle of continuous filaments combined into a discrete strand and wound into a cylindrical package without twist. Single-End Direct-Roving is composed of single fibers, which are spooled direct after handling with sizing. All fibers shows thereby the same tension.

This product is mainly recommended to customers engaged in pultrusion process where requirements regarding catenary are critical. Roving with reduced catenary will make possible to realize by 100% high mechanical properties of Basfiber and completely eliminate the issue with loops formation during processing. Advanced mechanical properties and chemical resistance of Basfiber ® allow to make stiffer and stronger products, more corrosion resistive but less expensive than special glass and carbon reinforced products.

  • Nomenclature

    Our nomenclature is based on three letter followed by three numbers split by dot and dashes.


    The first letter will be always R which stands for our Rovings products. The following letters AS - GN - DR represent the roving type:

    AS - Assembled Roving: External unwinding bobbin roving with on a tube or Internal unwinding (tubeless).

    GN - Gun Roving: Internal unwinding (tubeless)

    DR - Direct Roving: Direct Unwinding

  • Tex Info

    Tex of Direct roving is determined by:

    • Fiber's monofilament diameter;
    • Number of monofilaments in strand (i.e. number of nozzles in bushing);
    • Number of strands in Direct roving which is limited by number of places at the creel and acceptable level of catenary which is getting worse with increasing of number of strands in Direct roving.

    In our opinion, it is not wisely to use Direct roving which consist of more than 10 strands assembled together. Mechanical tests show 30% difference of tensile strength between Direct rovings consisting of 4 and 20 strands due to increased catenary.

  • Applications:

    Basalt Fiber Tech offers basalt fiber roving for filament winding. This product is recommended for manufacture of composite high pressure and corrosion resistant vessels. Main grade of the roving is designed for epoxy resin impregnation, but sizing for vinyl ester and polyester resins is also available. If your high pressure vessels are too heavy with E-glass or your CNG cylinders are very expensive with S-glass, you need our Basfiber®. If you are forced to renew your filter housing too often or your tubes are corroding too quickly you can try our basalt fiber.

    • High Pressure Vessels
    • Cng Cylinders
    • Waste Water Filters
    • Corrosion Resistant Tank & Pipes
    • Bridges
    • Load-Bearing Profiles
    • Grating & Concrete
    • Reinforcing Bars
  • General Properties

    Property Description
    Type of fiber Basfiber®
    Monofilament diameter [µm] From 10 to 22
    Linear density [tex] 270-4800
    Type of sizing 11, 12, 13, 15 and 42.
    Sizing content (% wt.) ≥0.4
    Resin compatibility Polyester, vinyl ester, epoxy
    Moisture content (% wt.) <0.1

    Thermal Properties
    Melting Range: 1460-1500°C
    Crystalization temperature: 1250°C
    Sintering Temerature: 1050°C
    Thermal Conductivity, W/(múK) 0.031-0.038

    Tensile Strength Change by heating Basfiber®
    Temperature +20°C +200°C +400°C
    Tensile Strength Change 100% 95% 80%

Mechanical Properties:

Nomenclature Monofilament diameter, µm Linear density, tex (g/km) Tensile strength, MPa
ASTM D2343
E-modulus, GPa
ASTM D2343
Tensile strength, mN/tex
ASTM D3822
RDR-10.90 10 ±0.5 90 ±5.0% 2900-3200 90-94 ≥750
RDR-11.110 11 ±0.5 110 ±5.0% 2900-3200 89-93 ≥750
RDR-13.150 13 ±0.5 150 ±5.0% 2900-3200 88-92 ≥700
RDR-17.250 17 ±0.5 250 ±5.0% 2900-3200 86-90 ≥650
RDR-17.600 17 ±0.5 600 ±5.0% 2900-3200 86-90 ≥650

Other Mechanical Properties: Chemical Stability
Monofilament diameter, µm: 10 13 17 Weightlessness: Cem FIL Basfiber® E-glass
Tensile test ASTM D-3822:
(Dry fiber) Tensile strength, mN/tex
≥700 ≥ 650 ≥ 600 3-hour boiling in water - 0.20% -
Tensile test ASTM D-2343:
(In epoxy impregnated strand) tensile strength, MPa
3200 3100 2900 3-hour boiling in saturated cement solution
(pH 12,9)
0.15% 0.35% 4.50%
Tensile test ASTM D-2343:
(In epoxy impregnated strand) tensile modulus, GPa
90-94 88-92 86-90 3-hour boiling in 2N solution HCl
(hydrochloric acid)
- 2-7% 38.50%
Tensile test ASTM D-2101:
(Basalt monofilament)tensile strength, MPa
4300 4200 4000 3-hour boiling in 2N solution NaOH
(sodium hydroxide)
- 6% -
Tensile test ASTM D-2101:
(Basalt monofilament) tensile modulus, GPa
95 93 92 30 minutes and in 180 minutes in H2SO4
(sulphuric acid)
- 2% - 6% 14% - 22%

Sizing Compatibility

No. of Sizing Type Compatibility Sizing content, % Weight Moisture, % Weight Single-End Multi-End
10 Silane EP, PF, PP*, acrylate, PA 0,4-0,8 <0,1 10-22 µm, 90- 600 tex 10-22 µm, 270- 4800 tex
11 Silane UP, VE, EP 0,4-0,8 <0,1 10-22 µm, 90- 600 tex 10-22 µm, 270- 4800 tex
12 Silane EP, PF 0,4-0,8 <0,1 10-22 µm, 90- 600 tex 10-22 µm, 270- 4800 tex
13 Silane concrete, EP, PF, acrylate 0,4-0,8 <0,1 11-19 µm, 90- 750 tex 13-17 µm, 300- 4800 tex

Thermal Properties:

Thermal operation range of Basfiber®
Thermal load duration Temperature range
Permanent From -260 up to +400°CC
(1) Stage 1: amorphous fiber with sizing on the fiber surface Up to +200°C
(2) Stage 2: burning of sizing (10-15 minutes), amorphous fiber From +200 up to +350°CC
(3) Stage 3: amorphous fiber without sizing on the fiber surface From +350 up to +400°CC
Short term (few minutes) From +400 up to +850°CC
(4) Stage 4: transition of FeO into Fe2O3 and beginning of crystallization From +400 up to +850°CC
Short term (few seconds) From +850 up to +1250°CC
(5) Stage 5: all the Fe2O3 is in crystal form, the material is extremely brittle, its mechanical properties are extremely poor but without stress and vibration it continues working as thermal insulation pretty good From +850 up to +1050°CC
(6) Stage 6: sintering temperature From +1050 up to +1250°CC


Rovings are supplied on a 120x80 cm pallet with 2-4-6 layers, each bobbin wrapped in thermal retractable film.

Linear Density, Tex Diameter Height Net Weight Bobbin, Kg
90 200mm 255mm 3 4 - -
110-350 200mm 255mm 3 4 5 -
350-840 200mm 255mm 3 4 5 8
On a 4-layered pallet could be supplied 60 bobbins
ca. 180 kg
60 bobbins
ca. 240 kg
56 bobbins
ca. 280 kg
44 bobbins
Ca. 352 kg
On a 6-layered pallet could be supplied 90 bobbins
ca. 270 kg
90 bobbins
ca. 360 kg
84 bobbins
ca. 420 kg
66 bobbins
ca. 528 kg
Bobbin SE-, AE-roving 76mm 260mm 3 5 - 9
Tube by SE - roving 76mm 270mm 3 5 8 -
On a 4-layered pallet could be supplied 192 bobbins
ca. 576 kg
140 bobbins
ca. 700 kg
96 bobbins
ca. 768 kg
88 bobbins
ca. 792 kg

Download Data Sheet

Download Direct Roving Technical Data Sheet in .PDF:
Download Direct Roving Material Safety Data Sheet - MSDS in .PDF:
Download our Basalt Continuous Filaments Sizing List in .PDF:

Disclaimer of Liability: This data is offered solely as a guide in the selection of reinforcement. The information contained in this publication is based on actual laboratory data and field test experience. We believe this information to be reliable, but do not guarantee its applicability to the user's process or assume any liability arising out of its use or performance. The user, by accepting the products described herein, agrees to be responsible for thoroughly testing any application to determine its suitability before committing to production. It is important for the user to determine the properties of its own commercial compounds when using this or any other reinforcement.