Moretec Audio Ferrofluid
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Moretec Audio Ferrofluid is a high-quality magnetic liquid used in the voice coil gap of loudspeakers to significantly enhance performance and reliability. It improves power handling, smooths frequency response, and stabilizes voice coil positioning by providing thermal conductivity, damping, and centering within the magnetic field.
We offer a variety of formulations with tailored magnetization and viscosity, suitable for tweeters, woofers, buzzers, and other speaker types. Our ferrofluid on a speaker are widely used in consumer electronics, automotive audio systems, and professional sound equipment.
Types of Moretec Audio Ferrofluid
Standard ferrofluid audio Model
Premium magnetic fluid for audio devices, ensuring smooth operation, enhanced sound clarity, and durability in high-performance speakers and transducers. Reliable, cost-effective, and industry-proven.
Standard Audio Ferrofluid Model
Custom Audio Ferrofluid Model
Tailored ferrofluid solutions for unique audio applications, optimized for specific frequency, temperature, and performance requirements. Precision-engineered for superior acoustics and longevity.
Custom Audio Ferrofluid Model
Why Use Audio Ferrofluid in Loudspeakers?
Thermal Conductivity – Higher Power Handling
Audio ferrofluid's thermal conductivity is 6x higher than air.
Enables the speaker to withstand over twice the input power.
Reduces thermal resistance rise, prevents dB drop, and extends lifespan.
Damping – Smoother Frequency Response
The audio ferrofluid's viscosity provides damping, reducing resonance peaks.
Improves Q factor and flattens the frequency response for better audio quality.
Centering – Lower Distortion
Viscous ferrofluid stabilizes the voice coil, keeping it centered.
Minimizes friction, prevents coil damage, and reduces dynamic and harmonic distortion.
Cost Reduction
Allows for elimination of spider suspension and use of smaller magnets.
Simplifies crossover design and supports more cost-effective voice coil materials (e.g., Lock wire).
Advantages of Moretec's Audio Ferrofluid
1. Excellent Thermal Conductivity and Power Handling
Moretec's audio ferrofluid replaces air in the speaker voice coil gap, significantly improving thermal conductivity. This reduces voice coil temperature, enhances power handling, and minimizes power compression.
2. Outstanding Damping Effect for Smoother Frequency Response
The audio ferrofluid's viscosity provides mechanical damping to the moving system, smoothing resonance peaks and improving dynamic linearity, resulting in better sound quality.
3. Stable Voice Coil Positioning for Lower Distortion
The audio ferrofluid forms a “liquid O-ring” in the magnetic gap, keeping the voice coil centered, reducing friction and misalignment, and lowering both dynamic and harmonic distortion.
4. Higher Manufacturing Yield and Cost Reduction
Moretec's audio ferrofluid can partially replace spider suspension systems and allows the use of smaller magnets and coils. This simplifies speaker design, increases production yield by 30–60%, and reduces material and manufacturing costs.
5. Multiple Models for Various Applications
Standard Models: Such as P‑110, P‑120, and P‑202, offering a range of saturation magnetization (110–325 Gauss) and viscosity (200 cP to 5000 cP), suitable for both consumer and professional audio systems.
Custom Models: Tailored for high-end or OEM applications, with parameters optimized for specific frequency characteristics, magnetic field strength, and viscosity.
Advantages of Moretec's Audio Ferrofluid
What is Ferrofluid?
Ferrofluid is an high-quality magnetic liquid that exhibits unique physical properties under a magnetic field. It consists of:
Magnetic nanoparticles (~10 nm in diameter, 1/20th the size of cigarette smoke particles)
Surfactants (to prevent agglomeration)
Carrier liquid (such as hydrocarbon or ester-based oils)
These nanoparticles are uniformly dispersed in the carrier fluid to form a stable colloidal solution. Initially developed by NASA in 1965 for the Apollo program, ferrofluid is now widely used in vacuum seals, loudspeakers, magnetic imaging, and more.
What is Ferrofluid?
Handling & Storage Guidelines for Moretec's Audio Ferrofluid
1. Storage
Store at room temperature and pressure. No refrigeration required.
Reseal immediately after use to avoid moisture or contamination.
2. Handling Notes
Do not shake before use to prevent bubble formation.
Ensure adhesive is completely cured and dry before injection.
Avoid leaving syringe in magnetic field during application.
Inject from a fixed point, evenly and in one step—no need for multiple points.
Do not replace standard viscosity ferrofluid with high-viscosity fluid, even in small amounts, as this may impair heat dissipation and shorten product lifespan.
Key Advantages of MTS Ferrofluid
1.Excellent Evaporation Performance (at 150°C)
Temperature MTS Ferrofluid (g/s·cm²)
150°C 5.03×10⁻⁹
As speaker temperature usually remains below 150°C, lower evaporation directly extends service life.
2.Superior Temperature Stability
Temperature Shift (65→80°C) MTS Viscosity Drop
<35%
Minimal viscosity drop ensures consistent damping and voice coil centering performance.
3.
No Phase Separation
Magnetic Field Strength MTS Separation Rate
12,500 Gauss <0%
No solid-liquid separation, avoiding splash, ensuring long-term stability.
4.
Excellent Adhesive Compatibility
Adhesive Type MTS Reaction Rate
CR-type DC868K 0%
No reaction with commonly used centering adhesives, preventing gelation or detachment issues.
Technical Specifications & Model Selection of Moretec Audio Ferrofluid
1.Appearance & Physical Properties
Property Value
Appearance Dark brown liquid
Viscosity 75 ~ 5000 cP
Saturation Magnetization 100 ~ 600 Gauss
Specific Gravity 0.9 ~ 1.2 g/cm³
Operating Temperature 100°C (PAO) / 150°C (Fluorinated)
Flash Point 260°C
2. Product Model Example
Example: P-2 10
P = MTS product code
2 = 200 Gauss saturation magnetization (2 × 100)
10 = 1000 cP viscosity (10 × 100)
3.Selection Guidelines
Application Recommended Magnetization
Tweeters / HF Drivers 100–200 Gauss
Midrange / MF Drivers 200–300 Gauss
Woofers / Buzzers >300 Gauss
Note:
Magnetic gap >9000 Gauss → choose 100G ferrofluid
Magnetic gap <9000 Gauss → choose 200G ferrofluid
High-sensitivity units → use lower viscosity ferrofluid
Normal units → higher viscosity is acceptable
How to Choose the Right Audio Ferrofluid for Your Speaker Design
1. Selection Guidelines
2.Based on Saturation Magnetization
3. Fluid Selection Examples
4. Influence of Ferrofluid on Damping
5. Moretec Magnetic Fluid Model Reference
1. Selection Guidelines
There is no universally fixed procedure for magnetic fluid selection. Choices can be made according to the magnetic flux density within the voice coil gap, the physical dimensions of the gap, and the system's frequency response characteristics.
Item Classification Selection Criteria
Type of loudspeaker Tweeters and high-frequency drivers Select magnetic fluids with low saturation magnetization (e.g., 100–200 Gauss)
Midrange and full-range drivers Select fluids with moderate saturation (200–300 Gauss)
Woofers and alarm devices Use fluids with relatively high saturation magnetization
Magnetic flux density within magnetic gap > 9000 Gauss Recommend fluids with ~100 Gauss saturation magnetization
< 9000 Gauss Recommend fluids with ~200 Gauss saturation magnetization
Others The damping characteristics of ferrofluids can influence the acoustic frequency response. Use low-viscosity fluids for high-sensitivity transducers; use higher-viscosity fluids where sensitivity is less critical.
2.Based on Saturation Magnetization
To mitigate ferrofluid splashing due to voice coil oscillation, careful consideration of the magnetic fluid’s saturation magnetization is essential.
Saturation Magnetization (Gauss) Typical Application Scenarios
110–220 Tweeters, headphones, high-frequency compression drivers, multimedia systems
220–330 Midrange drivers, full-range transducers, mid-frequency compression drivers, alarms
330–440 Woofers, subwoofers, heavy-duty alarm transducers
3.Fluid Selection Examples
Application Context Recommended Magnetic Fluid Characteristics
Long-stroke loudspeakers Use fluids with high saturation magnetization
Speakers requiring tailored frequency responses Select fluids with appropriate dynamic viscosity
Systems operating under strong magnetic fields Choose fluids with superior colloidal stability
High-power or long-term reliability requirements Use fluids with low volatility and minimal evaporation loss
4. Influence of Ferrofluid on Damping
Due to the inherent viscosity of ferrofluids, mechanical damping is introduced into the acoustic system, altering the frequency response. Therefore, proper selection of viscosity is critical.
Viscosity Grade Damping Effect on Voice Coil Motion
Low-viscosity type Produces minimal damping
High-viscosity type Produces greater damping
3.Moretec Magnetic Fluid Model Reference
Carrier Fluid Type Saturation Magnetization (mT) Dynamic Viscosity @ 27°C (mPa·s) Application Scope Moretec Magnetic Fluid Model
Synthetic hydrocarbon 11.0～35.7 100～4000 High-frequency transducers (tweeters) P-110
11.0～22.0 100～6000 Tweeters P-120
11.0～27.5 70～200 Compression drivers, tweeters, midrange P-202
11.0～27.5 90～1200 Compression drivers, tweeters, midrange, alarm speakers P-205
Synthetic ester 11.0～33.0 60～2,000 Woofers, tweeters P-220
16.5～41.2 65～1500 Woofers, subwoofers, midrange transducers, tweeters P-210
11.0～44.0 30～5,000 Woofers, subwoofers, compression drivers, tweeters, midrange P-240,P-250
11.0～32.5 25～200 Multimedia speakers, headphones P-302
FAQs about Moretec's Audio Ferrofluid
1
What is the chemical composition of ferrofluid?
Ferrofluid is composed of three main components: Magnetic nanoparticles, typically magnetite (Fe₃O₄ or γ-Fe₂O₃), Surfactants, which provide colloidal stability by preventing particle agglomeration, and Carrier liquid, such as synthetic hydrocarbons or esters, serving as the dispersion medium.
2
What are the functional effects of incorporating ferrofluid into a loudspeaker system?
Incorporating ferrofluid solution into the magnetic gap of a loudspeaker offers multiple technical benefits: Enhances thermal conductivity, improving power handling capability, Modifies and stabilizes the frequency response curve, Dampens unwanted resonances, thereby reducing harmonic distortion and preserving acoustic fidelity.
3
What is the maximum thermal tolerance of ferrofluid in speaker applications?
Ferrofluid used in electroacoustic systems can withstand temperatures up to 200°C, making it suitable for high-power or high-temperature applications.
4
What is the shelf life of ferrofluid under standard storage conditions?
Under room temperature and sealed storage conditions, the typical shelf life of ferrofluid is approximately 5 years, provided there is no exposure to moisture or oxidizing environments.
5
In which part of the loudspeaker is ferrofluid applied?
Ferrofluid is applied within the magnetic gap (also known as the voice coil gap) of the magnet circuit, surrounding the voice coil to facilitate both magnetic flux conduction and thermal management.
For more information about ferro liquid magnet and magnetite ferrofluid, please feel free to contact us!