PM Series: Precipitated Magnesium Hydroxide
Gansu Kaimeite (KMT) Materials Science and Technology Co., Ltd focuses on the research and development of precipitated magnesium hydroxide. Through the reaction between magnesium chloride and ammonia water
MgCl2 + 2NH3 ▪ H2O → Mg(OH)2 ↓ + 2NH4Cl
Every year we generate 30,000 tons of high-purity ultra-fine magnesium hydroxide and 10,000 tons of high-purity magnesium oxide;
PM series precipitated magnesium hydroxide are patent product developed recent years. Their performance could compete with high level magnesium hydroxide produced by Austria, Japan, Russia. It could be applied to produce low smoke zero halogen flame retardant cable and wire.
Flame Retardant Mechanism of Magnesium Hydroxide
Mg(OH)2 ———> MgO+H2O When the temperature reaches 340℃, magnesium hydroxide starts decomposing and generating water and Magnesium oxide. The water will absorb heat and dilute the oxygen content in the air to stop the fire, while the magnesium oxide will adhere to the surface of the combustible material to stop the fire and also absorb toxic gas and smoke produced during the fire.
First, we extract its main raw material directly from the saltwater to prepare the Magnesium Chloride solution, then the solution will go through a purification process to become the highly purified solution. After we get purified Magnesium Chloride solution, along with ammonia, two solutions will be added into the reactor and react under specific temperature, pressure, and other production conditions. We will get coarse precipitated Magnesium Hydroxide.
Finally, based on customer request, coarse precipitated Magnesium Hydroxide shall go through hydrothermal modification and milled into different particle sizes’ powder and coated with different additives. The entire production process is environmentally friendly and pollution-free. Ammonium water is recyclable, and no toxic matter is generated. That is what KMT industrial insisted on from the very beginning.
Process Flow Chart of Precipitated Magnesium Hydroxide
Data sheet
Table 1 PM Series MDH Technical Data | |
Mg(OH)2 | ≥99% |
CaO | ≤0.01% |
Fe- | ≤0.0005% |
Cl- | ≤0.10% |
LOI | 30-32% |
Whiteness | 96% |
Moisture | ≤0.2% |
Table 2 PM Series MDH Particle Sizes | |
Grades | Median Particle Sizes (D50) |
PM3 | 2.5-3.0 μm |
PM5 | 1.5-1.8 μm |
PM9 | 1.0-1.2um |
Table 2 shows the common particle size of precipitated MDH, and also some applications of the PM series. 1-2 micron MDH is suitable for to Banbury+extruder production process. 3-micron MDH can achieve better dispersity by using a reciprocating single screw, twin screw.
Download TDS according to the application
“ SN ” coated series
Introduction PM SN series are modified grades coated with special composite agent. it’s can be used for most type plastics compounds. such as HFFR cable compounds, EVA, POE, PP,TPU, TPE. It’s white powder, coated with KMT patent additives (but the main content are Dow 11-100 and 6598) It can help the powder better dispersing in the resin and fabricate the compound with high elongation at break.
Advantages
★Suitable for EVA/POE/LDPE based halogen free flame retardant formula.
★Good at HFFR Jacketing cable compounds
★Similar to American, Russian made synthetic magnesium hydroxide.
★Could achieve high elongation at break.
★Good charing formation performance.
★Higher limited oxygen index.
Grade | PM9SN | PM5SN | PM3SN | B3SN |
Mg(OH)2 (Before coated) | ≥99% | ≥99% | ≥99% | ≥90% |
Whiteness (R457) | ≥96% | ≥96% | ≥96% | ≥95% |
Moisture | ≤0.5% | ≤0.5% | ≤0.5% | ≤0.5% |
BET(m2/g) | 15-22 | 15-18 | 8-13 | 8-13 |
Bulk Density (g/cm3) | 0.6 | 0.6 | 0.6 | 0.6 |
Particle Size D50 | 1.1-1.3μm | 1.4-1.7μm | 2.5-3.2μm | 2.5-3.2μm |
Coating | KMT composite agent | |||
Application
EVA-based formula test data . ——-> contact info@kmtindustrial.com
PE/EVA-based Formula test data ——-> contact info@kmtindustrial.com
“ E ” coated series
PM series Mg(OH)2 is a high purity synthetic magnesium hydroxide. The powder is treated with special agent to help improve its compatibility with different resin. PM E series are modified grades coated with Silane composite agent, it is tailor-made for no EVA, PE-based formula, such as PE, PE/POE...etc, and represents a halogen free flame retardant with low smoke emission and high thermal stability up to 340℃.
Advantages
★Suitable for high oxygen index halogen free PE compound.
★ Could Achieve high elongation at break while filling 50~60%.
★ Using special coating system, easily dispersing in PE.
★Cost saving, no need EVA to improve elongation at break.
Grade | PM5E | PM3E |
|
Mg(OH)2 (Before coated) | ≥99% | ≥99% |
|
Whiteness (R457) | ≥96% | ≥96% |
|
Moisture | ≤0.5% | ≤0.5% |
|
BET(m2/g) | 12-18 | 8-15 |
|
Bulk Density (g/cm3) | 0.5 | 0.58 |
|
Particle Size D50 | 1.5-1.8μm | 2.5-3.0μm |
|
Coating | KMT composite agent | ||
Application
PE-based formula test data ——-> contact info@kmtindustrial.com
“ V ” coated series
Introduction PM V series flame retardant is a modified Mg(OH)2 coated with stearic acid, it is tailor-made for PVC-based formula, aiming to replace Sb2O3 in low smoke flame retardant PVC formula without lowering the oxygen index and mechanical properties of the original PVC compound.
Advantages
★Suitable for high oxygen index PVC compound without using Sb2O3.
★Good smoke absorbing capacity.
(ATH and MDH reduce smoke density by releasing water during the combustion of polymeric materials. In case of PVC, magnesium hydroxide shows higher efficiency as smoke suppressant, so the formula no need add much Molybdenum Smoke Suppressant.)
★Comapre to ATH, MDH (PM3V&B3V) can absorb more acid.
(When heated, MDH and ATH both generate water and metal oxide. Water absorbs heat, and metal oxide covers the surface of the polymer. But MgO can absorb more acid than Al2O3.)
★High whiteness, shall not affect the color of the PVC compound.
★Coated by stearic acid, easy disperses in the compound.
★Cost saving, replace antimony trioxide/molybdenum smoke suppressant
Grade | PM3V | B3V |
Mg(OH)2 (Before coated) | ≥99% | ≥40% |
Mineral | – | ≥55% |
Whiteness (R457) | ≥96% | ≥92% |
Moisture | ≤0.5% | ≤0.5% |
BET(m2/g) | 8-15 | 8-15 |
Bulk Density (g/cm3) | 0.6 | 0.6 |
Particle Size D50 | 2.5-3.2μm | 2.5-3.2μm |
Coating | Stearic acid | Stearic acid |
Application
PVC compounds test data for reference ——-> contact info@kmtindustrial.com
“ AS ” coated series
Introduction PM AS series flame retardant is a modified Mg(OH)2 coated with composite surface additives for silicon rubber, gap filler application.
Advantages
★ Compare normal MDH, PM3AS easy dispersing in silicone rubber gives higher flowability, easy fillling.
★ Compare with ATH, PM3AS can reduce smoke density,
Grade | PM3AS |
Mg(OH)2 (Before coated) | ≥99% |
Whiteness (R457) | ≥96% |
Moisture | ≤0.5% |
BET(m2/g) | 8-11 |
Bulk Density (g/cm3) | 0.6 |
Particle Size D50 | 2.5-3.0μm |
Coating | Composite surface coated |
KMT Industry's Services Always Go Extra Mile
Formular and polymer test Available
If you want a basic formula to compare with competitors grades, we can support it in our lab.
Lighting Fast Delivery
Normal grades have the inventory to support fast delivery.
Start With Low MOQ
If you want to have a trial test, we support a minimum order quantity of small kgs for the first order.
