Overview: This document is a datasheet for plastic bonded neodymium magnetic materials provided by Bakker Magnetics. It includes detailed specifications and properties of various grades of these magnets.

Magnetic Properties: The datasheet lists several grades of plastic bonded neodymium magnets, including bm 4 np, bm 7 np, bm 8 np, bm 9 np, bm 10 np, and bm 12 np. For each grade, it provides values for remanence (Br), normal coercivity (-HcB), intrinsic coercivity (-HcJ), and maximum energy product ((B-H)max). These values are given in both imperial and metric units, such as kg, mt, koe, ka/m, Mgoe, and Kj/m³.

Temperature and Density Characteristics: The document outlines the temperature coefficients for Br and HcJ, density ranges, relative permeability, Curie temperature, and recommended operating conditions. For instance, the temperature coefficient of Br is typically -0.10%/°C, and the density ranges from 4.2 to 6.4 g/cm³ depending on the grade.

Graphical Data: The datasheet includes graphs for BM 7np and BM 9np, showing the relationship between magnetic field strength (H) and magnetization (J) at various temperatures (+20°C, +80°C, +100°C, +150°C). The conversion factors are provided: 1 koe = 79.6 ka/m and 0.1 t = 1 kgs.

Key Recommendations: The recommended continuous operating temperature is 120°C for most grades, with a minimum magnetizing field of ≥ 20 koe (≥ 1592 ka/m).