Basalt Fiber CSM
Grade
GB GB/T 25045
CSM = chopped strand mat / needled mat
Pick the chopped strand or needled mat for hand lay-up laminates and fire-protection insulating layers; it wets out fast but is randomly oriented, so properties are isotropic and low.
Values for the CSM condition
Other Basalt Fiber grades and fills
Basalt Fiber is listed in 6 conditions; see the grade overview at Basalt Fiber.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Basalt mineral wool | Choose this discontinuous ultra-fine fibre board or blanket when 0.038 W/m·K conductivity, non-combustibility and 650 °C service matter rather than mechanical strength. | — | 0.01 | — | — |
CSMThis page Chopped strand mat / needled mat | Pick the chopped strand or needled mat for hand lay-up laminates and fire-protection insulating layers; it wets out fast but is randomly oriented, so properties are isotropic and low. | — | 130 | 1.8 | — |
BFRP rebar / pultruded rod (epoxy or vinyl-ester matrix) | Use the pultruded rebar or rod to replace steel bar in marine, tunnel-boring and de-icing-salt environments: non-corroding and non-magnetic, but modulus is a quarter of steel and it cannot be bent on site. | — | 1,100 | 2.3 | — |
Milled fibre | Pick 0.1–1 mm milled micro-fibre as a reinforcing filler in friction materials, coatings, adhesives and resins, replacing asbestos and milled glass fibre, at 2500 MPa fibre strength. | — | 2,500 | 3 | — |
Chopped strand | Use 3–24 mm chopped strand to control cracking and toughen cement-based materials or to reinforce PP/PA moulding compounds; alkali resistance allows direct use in concrete. | — | 2,900 | 3.1 | — |
High-temperature / high-modulus grade | Select the ore-selected melt with controlled Fe/Ti and low alkali when 95 GPa modulus and 680 °C service are required for friction, thermal-insulation and aerospace parts. | — | 3,300 | 3.2 | — |
What is Basalt Fiber CSM?
Basalt Fiber CSM is Basalt Fiber in the CSM grade — pick the chopped strand or needled mat for hand lay-up laminates and fire-protection insulating layers; it wets out fast but is randomly oriented, so properties are isotropic and low. Basalt Fiber CSM has a tensile strength of 130 MPa (18.9 ksi), weaker than 59% of composite grades. Elongation at break is 1.8% and the elastic modulus is 12 GPa (1.74 Msi). Basalt Fiber CSM has a density of 1.7 g/cm³ (0.0614 lb/in³), lighter than 52% of composite grades.
Advantages
- Low embodied carbon — 1.8 kg CO₂/kg, better than 98% of composite grades
- Low moisture uptake — 0.05%, better than 94% of composite grades
- High service temperature — 600°C (1,112 °F), better than 88% of composite grades
- Good UV / weathering resistance — 95/100, better than 78% of composite grades
Basalt Fiber CSM properties
Typical room-temperature values for Basalt Fiber CSM; 14 are specific to this condition. Other listed values are Basalt Fiber reference data and may not represent this condition. Bars are the position among composite grades.
Physical3
Basalt Fiber CSM has a density of 1.7 g/cm³ (0.0614 lb/in³), lighter than 52% of composite grades.
Mechanical6
Basalt Fiber CSM has a tensile strength of 130 MPa (18.9 ksi), weaker than 59% of composite grades. Elongation at break is 1.8% and the elastic modulus is 12 GPa (1.74 Msi).
Thermal8
Basalt Fiber CSM is rated for continuous service to 600°C (1,112 °F). It conducts heat at 0.3 W/m·K (0.173 BTU/hr·ft·°F), worse than 63% of composite grades. Thermal expansion is 8 µm/m·K (4.44 µin/in·°F).
Electrical2
Basalt Fiber CSM has an electrical resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 54% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of Basalt Fiber CSM takes about 22 MJ of energy and emits 1.8 kg of CO₂ — less than 98% of composite grades. Typical recycled content is 0%.
Manufacturability1
Basalt Fiber CSM's machinability is fair (35/100, better than 50% of composite grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Basalt Fiber CSM
Is Basalt Fiber easy to machine?
Cured basalt-fiber composites are highly abrasive; use diamond or PCD tooling at high spindle speed and low feed with dust extraction to avoid delamination and edge burrs.
Can Basalt Fiber be welded?
Inorganic fiber cannot be welded; BFRP parts are joined by adhesive bonding, mechanical fastening or co-curing with the resin.
Can Basalt Fiber be formed, bent or molded?
Suitable for pultrusion, filament winding, vacuum infusion, RTM, SMC/BMC and chopped-fiber reinforced injection moulding. The fiber is brittle, so control bend radius and tension during processing; finished parts cannot be bent a second time.
What surface finishes work on Basalt Fiber?
The sizing determines resin adhesion and must be matched to the matrix system. Seal cut edges with resin and use mineral-fiber dust protection when cutting or handling.
Basalt Fiber chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiO2network former; varies with ore source | 45 – 60 | 52 |
| Al2O3 | 12 – 19 | 16 |
| Fe2O3+FeOiron oxides give the fiber its gold-brown color | 5 – 15 | 10 |
| CaO | 5 – 12 | 8.5 |
| MgO | 3 – 8 | 5 |
| Na2O+K2Oalkali content affects hydrolysis resistance | 1.5 – 6 | 3.5 |
| TiO2 | 0.5 – 2.5 | 1.2 |
| sizing (silane, )surface coating, not counted in the glass phase | 0.3 – 1.5 | 0.7 |
| (MnO, P2O5, SO3) | ≥ 0 (balance) | — |
Basalt Fiber CSM — frequently asked
What is Basalt Fiber CSM used for?
Basalt Fiber CSM is typically used for rebar reinforcement, fireproof textiles, automotive and marine composites and geotextiles. In short: stiffer than E-glass; service to 600 C; good alkali resistance.
What is the tensile strength of Basalt Fiber CSM?
Basalt Fiber CSM has a typical tensile strength of 130 MPa (18.9 ksi) — weaker than 59% of composite grades. Strength varies by condition: see the 6 listed tempers.
Is Basalt Fiber CSM easy to machine?
Not especially — machinability is rated fair (35/100, better than 50% of composite grades). Cured basalt-fiber composites are highly abrasive; use diamond or PCD tooling at high spindle speed and low feed with dust extraction to avoid delamination and edge burrs.
Can Basalt Fiber CSM be welded?
Inorganic fiber cannot be welded; BFRP parts are joined by adhesive bonding, mechanical fastening or co-curing with the resin.
What surface finishes work on Basalt Fiber CSM?
The sizing determines resin adhesion and must be matched to the matrix system. Seal cut edges with resin and use mineral-fiber dust protection when cutting or handling.
Can Basalt Fiber CSM be formed, bent or molded?
Suitable for pultrusion, filament winding, vacuum infusion, RTM, SMC/BMC and chopped-fiber reinforced injection moulding. The fiber is brittle, so control bend radius and tension during processing; finished parts cannot be bent a second time.
What is the maximum service temperature of Basalt Fiber CSM?
Basalt Fiber CSM is rated for continuous use to about 600°C (1,112 °F), and briefly to 900°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Continuous Basalt Fiber Roving technical data — Kamenny Vek / (2023)
- ASM Handbook Vol. 21: Composites — inorganic fibres — ASM International (2001)
- Basalt fibre property compilations (Composites Part B / Construction & Building Materials reviews) — Elsevier (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.