# Density

**Density** is a scalar physical quantity determined as a relation of the mass of the body to the volume occupied by this body.

Average density of a body is a relation of the mass of the body to its volume. For a uniform body it is also designated just as density of a body.

Density of a substance is a density of a uniform body consisting of this substance.

Proceeding from determination of the density its measurement unit is kg/m³ (or g/cm³).

For granular and porous materials the following parameters are distinguished:

– real density determined without taking into account interstices;

– specific (apparent) density calculated as a relation of the mass of the substance to all volume occupied by it.

The real density is received from the apparent one by means of the porosity ratio that is a share of the volume of interstices in the occupied volume. For granular materials specific density is designated as bulk density.

**Comparison of polyamides by density**

Material | Value of density, g/cm³ |
Reference document |
---|---|---|

PA 6-210/310 | 1.13 - 1.14 | OST 6-06-S9-93 |

PA 610 | 1.09 - 1.11 | GOST 10589-87 |

PA 66 | 1.12 - 1.16 | TS 6-13-0204040-51-90 |

PA 6-211-KS | 1.35 - 1.38 | OST 6-11-498-79 |

PA 6-210-DS | 1.27 - 1.34 | GOST 17648-83 |

PA 6-211-DS | 1.38 - 1.41 | GOST 17648-83 |

PA 610-LSV30 | 1.34 - 1.35 | TS 6-06-134-90 |

PA 610-KS | 1.29 - 1.33 | OST 6-11-498-79 |

PA 610-DS | 1.38 | GOST 17648-83 |

PA 66-KS | 1.35 - 1.38 | OST 6-11-498-79 |

PA 66-DS | 1.39 - 1.41 | GOST 17648-83 |