MEIQING INDUSTRIAL GROUPFerrofluid · Ferrotec EMG Series
PRODUCT SPECIFICATIONS

All 26 EMG Grades
Full parameter tables

Three carriers, 26 standard grades, all available from 10 mL. This page lists the saturation magnetization and viscosity for every grade, and explains the boundary of each series. Parameters follow Ferrotec published data — original datasheets and MSDS are available on request.

Ask which grade fits Jump to specifications
5Oil-based grades
17Water-based grades
4Dry powder grades
10 mLMinimum order
EMG OIL-BASED

EMG Oil-based Ferrofluid 5 grades

Carrier: light hydrocarbon ｜ Appearance: black-brown low-viscosity liquid ｜ Nominal particle size: 10 nm

The oil-based series is the right choice when the carrier must not evaporate, must not mix with the surrounding medium, or when you need a low viscosity. It is the most widely used series for sealing, damping and general laboratory work.

GradeSaturation magnetization (Gs)(mT)Viscosity @27°C (cP)Positioning
EMG 9009909960Strongest magnetic response in the range
EMG 90166066<10High Ms with low viscosity
EMG 90544044<5Medium-high Ms, good flow
EMG 90922022<5General purpose
EMG 91111011<5Low Ms, low particle loading

Physical properties — EMG 900

Density1.74 g/cc
Pour point−94 °C
Flash point89 °C
Initial susceptibility1.48
Particle concentration17.7 % vol
CarrierLight hydrocarbon
Why pour point and flash point matter A pour point as low as −94 °C means the fluid will not solidify in a cold environment. A flash point of 89 °C means it should be handled as a flammable liquid during high-temperature operation and in transport. Full property data for the other oil-based grades is available on request.
EMG WATER-BASED

EMG Water-based Ferrofluid 17 grades

Carrier: deionized water ｜ Appearance: black-brown low-viscosity liquid ｜ Nominal particle size: 10 nm

The water-based series suits applications where the carrier should evaporate quickly, or where magnetic particles must be introduced into an aqueous system. It is the main series for magnetic domain observation, biomedical work and in-vitro diagnostics. Water-based grades come with either anionic or cationic surfactant systems, which directly affects compatibility with your target system — please confirm this at the selection stage.

GradeSaturation magnetization (Gs)(mT)Viscosity @27°C (cP)
High magnetic response · 275 Gs and above
EMG 601P44044<5
EMG 70035535.5<10
EMG 603P33033<5
EMG 30427527.5<10
Medium magnetic response · 110–220 Gs (most commonly used band)
EMG 60522022<5
EMG 605P22022<5
EMG 70522022<5
EMG 50711011<5
EMG 60711011<5
EMG 607P11011<5
EMG 70711011<5
Low magnetic response · 66 Gs and below (low particle loading, high flow)
EMG 308666.6<10
EMG 408666.6<5
EMG 508666.6<5
EMG 608P666.6<5
EMG 708666.6<5
EMG 509333.3<5

The numeric prefix indicates the product family (300 / 400 / 500 / 600 / 700 series). Grades with a P suffix are a different surfactant system version — carrier and Ms are close to the non-P equivalent, but interfacial charge and compatibility differ. Which one you need depends on the pH, ionic strength and downstream process of your target system.

Example: EMG 608P

Black liquid, water carrier, saturation magnetization 66 Gs (6.6 mT), viscosity <5 cP, density 1.04 g/cc, cationic surfactant, pH 8–8.5.

Example: EMG 707

Black-brown liquid, water carrier, nominal particle size 10 nm, saturation magnetization 110 Gs (11 mT), viscosity <5 cP, density 1.10 g/cc, anionic surfactant, initial susceptibility 1.51.

Important: use water-based grades within 3 months of purchase Ferrotec states that the magnetic particles in water-based ferrofluid tend to agglomerate; for best results, use within three months. We therefore recommend buying to your stage requirement rather than stockpiling a year's supply. Store protected from light, upright, at room temperature, and close the cap immediately after dispensing to avoid carrier evaporation and dust ingress. If the liquid thickens, becomes gritty or separates, treat it as degraded and do not use it for precision work.
EMG DRY MNP

EMG Dry Magnetic Nanoparticle Powder 4 grades

Carrier: none ｜ Appearance: black powder ｜ Nominal particle size: 10 nm ｜ Pre-coated with a specific surfactant

This series is dry powder with no carrier liquid. The particle core is still magnetite, pre-coated with a specific type of surfactant so that it can be suspended in the corresponding solvent. You disperse it into your target solvent yourself — simple stirring is usually enough, with heat or ultrasonic agitation if needed. What it gives you is formulation freedom: solvent, concentration and subsequent modification are all decided by the user.

GradeSurfactant typeBest suited to
EMG 1200Fatty acidNon-polar / weakly polar organic solvent systems
EMG 1300MPolymerSystems needing stronger steric hindrance and dispersion stability
EMG 1400HydrophobicOil phase, hydrophobic matrices, magnetic polymer materials
EMG 1500PolarPolar solvent systems

Properties common to the dry powder series

Nominal particle size10 nm
Domain stateSingle domain
Magnetic behaviourTruly superparamagnetic · no hysteresis
Initial susceptibility0.2
Core materialMagnetite Fe3O4
DispersionStirring; heat or ultrasound if needed

Ferrotec notes that these particles generally show good compatibility with living tissue, but has not obtained FDA approval for in-vivo use — the product is currently recommended for research use only. The coating type determines which solvent it will disperse in stably, so tell us your target solvent and we will advise on compatibility.

BIOMEDICAL & IVD

Biomedical and in-vitro diagnostics

Using the small size and uniformity of the particles to stabilise bead performance

In this direction the value of the material comes from two things: the particles are extremely uniform with virtually no agglomerates, and the size is around 10 nm. The first gives batch-to-batch consistency in bead performance and enables smaller bead formats; the second provides a larger specific surface area, which improves reaction efficiency.

Two main uses

Ferrotec has more than 30 years of ferrofluid manufacturing experience in this field and offers a range of fluid and powder characteristics for bead manufacturers and researchers to optimise against a specific assay format.

Compliance note: Ferrotec states that its ferrofluids are not FDA-approved for in-vivo testing or therapy in humans and are currently recommended for research use only. We supply this direction for R&D and in-vitro diagnostic development only — not for clinical or in-vivo applications.
ORDERING & HANDLING

Packaging, minimum order and documentation

Minimum orderStandard grades start at 10 mL, so there is no need to buy a full batch for a research trial. Bulk quantities are priced per litre.
DocumentationMSDS/SDS, batch number and measured data such as saturation magnetization. Batch numbers are traceable.
Lead timeIn-stock grades typically ship in 3–5 business days. Non-stock grades follow the Ferrotec channel lead time, confirmed in writing before order.
StorageProtect from light, store upright at room temperature. Water-based grades should be used within three months.
ShippingShips worldwide from Shenzhen, China. We assist with commercial invoice and packing list for export orders.
Not on this list?If you need a characteristic not covered by the 26 standard grades, tell us — we can raise specific requirements with Ferrotec.

Tell us your medium and your goal

We will recommend a specific grade from the 26 — or tell you that ferrofluid is the wrong material for your application. Usually within 48 hours.

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