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The GMG series of thermal grease has excellent thermal conductivity, which can create an efficient thermal conduction channel between the heating element and the heat sink to effectively enhance the heat dissipation effect. The series has the characteristics of dustproof, anti-corrosion, shockproof and other characteristics to provide heat dissipation and protection for electronic components. It can ensure stable electrical performance of electronic components such as power amplifiers, electronic tubes, CPUs, etc., and improve the performance of electronic instruments and meters.
Project/Model | Testing standards | GMD-100 (1W) | GMD.150 (1.5W) | GMD-200 (2W) | GMD-250 (2.5w) | GMD-300(3W) | GMD-400(4W) |
| Appearance/Color | Visualization | White (semi flowing or thixotropic) | White (semi flowing or thixotropic) | Gray (semi flowing or thixotropic) | Gray (semi flowing or thixotropic) | Gray (semi flowing or thixotropic) | Grey (thixotropic) |
| Thermal Conductivity( w/m.k) | ASTM-D5470 | ≥1.0 | ≥1.5 | ≥2.0 | ≥2.5 | ≥3.0 | ≥4.0 |
| Thermal resistance(K.m 2/w) | ASTM-D5470 | ≥0.5 | ≥0.4 | ≥0.3 | ≥0.3 | ≥0.25 | ≥0.25 |
| Density （g/cm3） | ASTM D792 | 2.0(±0.5) | 2.5(±0.5) | 3.0(±0.2) | 3.0(±0.2) | 3.0(±0.2) | 3.0(±0.2) |
| Oil separation200°/24H) | HB/T269 | 0.30% | 0.30% | 0.2% | 0.2% | 0.15% | 0.1% |
| Only in degree(1/10mm) | HG/T2502 | 300±10 | 300±10 | 270±10 | 270±10 | 245±10 | 230±10 |
| Breakdown voltage( KV) | ASTM-D149 | ＞5 | ＞5 | ＞5 | ＞5 | ＞5 | ＞6 |
| Volume resistivity （Ω·cm） | A5TM-D257 | ＞1.0*1012 | ＞1.0*1012 | ＞1.0*1012 | ＞1.0*1012 | ＞1.0*1012 | ＞1.0*1012 |
| Dielectric constant(KV/mm) | ASTM-D150 | ≤6 | ≤6 | ≤6 | ≤6 | ≤6 | ≤6 |
| Volatile content(200°/24H ) | HB/T269 | ≤0.3% | ≤0.3% | ≤0.2% | ≤0.2% | ≤0.2% | ≤0.1% |
| Flame-retardant | UV-94 | V0 | V0 | V0 | V0 | V0 | V0 |
| Operating temperature | -40~+200° | -40~+20° | -40~+200° | -40~+200° | -40~+200° | -40~+200° | -40~+200° |
Parameter characteristics:
1、 Electrical characteristics
1. Breakdown voltage: The measurement of breakdown voltage is the voltage value that a thermal conductive material can withstand under specific conditions. This value indicates the electrical insulation ability of the thermal conductive interface material.
2. Volume resistivity is used to measure the volume electronic resistance per unit volume of material. Volume resistivity guides the ability of thermal interface materials to leak current between energized components and metal heat dissipation devices.
3. Dielectric constant: refers to the ability of a substance to maintain charge, also known as capacitance, which is related to the electrical properties of insulating materials, the intensity of reflected pulse signals, the wave reflection coefficient at the interface, and the attenuation coefficient of transmitted waves. It mainly depends on the conductivity and dielectric constant of the surrounding medium and reflector.
2、 Thermal characteristics
1. Thermal conductivity: Thermal conductivity is a marker that determines the thermal conductivity of a thermal conductive interface material. The larger the thermal conductivity, the better the thermal conductivity.
2. Thermal resistance: Thermal resistance is equal to R=d (thickness)/k (thermal conductivity), which indicates that thermal resistance is inversely proportional to thermal conductivity k and directly proportional to material thickness. That is to say, the thermal conductivity of a material is a constant, and the thermal resistance is only related to the thickness of the material. The thicker the thickness, the greater the thermal resistance, and vice versa.
