Ferrofluid Repair Kit

Ferrofluid 900uL General Purpose for 4" Diameter Coil

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Part Number: MI-FF900

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Ferrofluid Repair Kit, 900uL for 4" Diameter Voice Coil Part # MI-FF900

Ferrofluid Repair Kit
900uL for 4" voice coil
Reduces distortion
Increases power handling
Comes complete with cleaning strips and instructions
For most compression drivers, repairs, and diaphragm assemblies
SDS

Our ferrofluid kits come with pre-measured packets of ferrofluid which are used to replace the old fluid in speaker air gaps when replacing diaphragm and coil assemblies.

Ferrofluid improves the performance of high frequency and midrange drivers. It works by damping the impedance at resonance to effectively lower distortion, smooth frequency response, and increase thermal power handling. It should be used to replenish drivers treated previously with ferrofluid. With care, it can also upgrade most drivers that have never contained ferrofluid. The kits listed are approximate fill quantities relative to approximate voice coil diameters. In general, the air gap should be 75% filled prior to inserting a voice coil diaphragm assembly. The kit contains synthetic ester-based ferrofluids and in most cases should not pose any adhesive incompatibility. It is recommended that this is confirmed by contacting the driver manufacturer prior to usage. Adding ferrofluid to a driver not intended for it will, in most cases, void the original manufacturer's warranty. Included in kit: A ferrofluid packet, absorbent paper strips for removing old ferrofluid, detailed instructions, and material safety data sheet.

Specifications and Physical Properties

Appearance	black-brown or red-brown viscous fluid
Carrier Liquid	synthetic ester oil

	CGS Units	SI Units
Saturation Magnetization (Ms)	220 Gauss	22 mT
Viscosity @27°C	200 cP	200 mPa·s
Density @25°C	1.16 g/cc	1.16 10³ kg/m³
Pour Point	-35 °C	-35 °C
Flash Point	>200 °C	>200 °C
Thermal Conductivity @38°C	150 mW/(m·K)	150 mW/(m·K)
Surface Tension @25°C	32 dynes/cm	32 mN/m
Coefficient of Thermal Expansion	7.5 x 10^-4 ml/ml°C	7.5 x 10^-4 /K

Rating Snapshot

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Average Customer Ratings

5.0

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Works great.

This worked great to repair several tweeters. They sound like new and don't sound as harsh! -Dirk

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Reviewed by: Dirk from Fremont on 4/2/2017

Jt speakers owner

Excellent srevice

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Jorge touzet from Miami on 2/5/2018

Enthusiast

Excellent quality comparable to the original one used in B&W 800 Diamond series. Rebuilt one of the drivers and got them compared with side by side, no sonic difference at all.

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Reviewed by: Zeeman from HK on 11/6/2019

Works like a dam

It works great. The magnet draws it in. Get the proper size for your tweeter though.

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Reviewed by: William Brunskill from Calgary on 3/12/2021

ferrofluid 900µL

all is OK.

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Reviewed by: GERARD LUC from CHAUDFONTAINE on 10/5/2017