# Strength, rigidity and density characteristics

KVH^{®} structural timber is available in the strength class C24 according to the agreement on KVH^{®}. Strength classes C18 and C30 are available on request.

Strength class | C18 | C24 | C30 | |

| ||||

Strength values in N/mm² | ||||

Characteristic value of Bending strength |
| 18 | 24 | 30 |

Characteristic value of Tension parallel to grain strength |
| 11 | 14 | 18 |

Characteristic value of Tension perpendicular to grain strength |
| 0.4 | 0.4 | 0.4 |

Characteristic value of Compressed parallel to grain strength |
| 18 | 21 | 23 |

Characteristic value of Compression perpendicular to grain strength |
| 2.5 | 2.7 | 2.7 |

Characteristic value of Shear and torsional shear strength |
| 2.0 | 2.0 | 2.0 |

Stiffness values in N/mm² | ||||

Mean value of modules of elasticity parallel to grain |
| 9,000 | 11,000 | 12,000 |

Characteristic value of modules of elasticity |
| 6,000 | 7,400 | 8,000 |

Mean value of modules of elasticity perpenilicular to the grain |
| 300 | 370 | 400 |

Mean value of Shear modulus |
| 560 | 690 | 750 |

Density values in kg/m² | ||||

Characteristic value of Density |
| 320 | 420 | 460 |

Mean value of density |
| 380 | 420 | 460 |

a) For structural timber with rectangular cross-section and density of *P*_{k} < 700 kg/m³, the characteristic strength value can be multiplied by the coefficient

k_{h}= min.{(150/h)^{0.2}/1.3}

when bending cross-section heights and applying traction of h<150 mm to cross-section widths; see EN 1995-1-1: 2010-12, 3.2 (3).