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Product

MR-conditional carbon biopotential leadASTM F2503 MR-Conditional1.5T / 3T / 7T MRI1.5 mm DIN 42802

BIOPAC LEAD108B / LEAD108C MRI-Conditional Carbon-Composition1.5 T, 3.0 T & 7.0 T MRI-conditional radiotransparent carbon-composition ECG/EEG/EMG lead

MR-conditional non-ferromagnetic carbon-composition biopotential lead compatible with BIOPAC LEAD108B / LEAD108C for simultaneous fMRI + ECG, EEG, EMG and EOG recording without RF loop heating or susceptibility artefacts.

Low-EMC design
EMC screen
Oil-resistant
Approved
Order designation
MRC-LEAD108B-SNAP-150
Lead length
1.50 m
Total resistance
165 Ω
Cable OD
2.3 mm
MR field rating
1.5T / 3T / 7T
All sizes (12)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
MR field rating
1.5T / 3T / 7T
MR-Conditional per ASTM F2503
Core material
100 % Carbon
Zero ferromagnetic metal inside bore
Distributed R
90–350 Ω/m
Damps RF standing-wave heating
Electrode end
Carbon Snap/Clip
Radiotransparent Ag/AgCl snap or pinch
Amplifier end
1.5 mm DIN
Touch-proof IEC 60601-1 / DIN 42802
Jacket
USP Class VI
Biocompatible medical TPU / silicone

Typical values for this cable type, based on ASTM F2503 /ASTM F2182 / IEC 60601-2-33 / ANSI/AAMI EC53 — confirmed in the datasheet and quotation for your order.

Application fit

Is BIOPAC LEAD108B / LEAD108C right for your machine?

Engineered specifically for inside-bore physiological monitoring and simultaneous fMRI neuroscience research.

Fixed installation

Suitable

Distributed resistive carbon-filament conductor suppresses 64 MHz (1.5 T), 128 MHz (3 T) and 298 MHz (7 T) RF standing-wave currents.

Switchgear & control cabinet wiring

Suitable

Medical-grade TPU/silicone jacket resists hospital quaternary ammonium, isopropyl alcohol and hydrogen peroxide disinfectants.

Self-supporting pendant & push-button drop

Suitable

Ultra-supple 3,000-filament carbon tow withstands repeated patient attachment and routing through MRI head coils.

Energy chain / drag chain

Not suitable

Medical patient lead assembly is intended for clinical and research MRI suites, not industrial drag chains.

Use M8 Sensor Cordset
Typical machinesSimultaneous fMRI + EEG / ECG ResearchClinical MRI Patient Gating & Vital MonitoringTranslational Pre-Clinical 7T / 9.4T MRICardiac MRI Triggering & GatingPolysomnography & MEG Biopotential Recording

Construction

Layer by layer

Representative LEAD108B / LEAD108C architecture: continuous 3K/6K carbon-fibre multi-filament resistive core + optional carbon-loaded semiconductive screen + USP Class VI medical TPU jacket + all-plastic/carbon electrode snap.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Multi-filament carbon-composition core3,000 to 6,000 continuous high-purity polyacrylonitrile (PAN) carbon filaments (distributed resistance 90–350 Ω/m, magnetic susceptibility χ ≈ −10⁻⁵)Eliminates metallic RF antenna resonance, eddy-current heating and B0 magnetic susceptibility artefacts
2Medical-grade TPE / fluoroelastomer primary insulationFlexible dielectric core insulation (2.0 kV dielectric withstand)Isolates biopotential signal path during high dB/dt EPI gradient switching
3Optional carbon-polymer conductive screen (LEAD108C)Extruded carbon-loaded conductive polymer shield layer (on screened LEAD108C variants)Attenuates gradient-switching electric-field pickup without introducing metal braiding into the MRI bore
4Biocompatible USP Class VI medical TPU jacketSmooth, non-tacky thermoplastic polyurethane (TPU) or platinum-cured silicone outer jacket (ISO 10993-5 / -10 biocompatible)Comfortable against patient skin and wipe-clean resistant to hospital disinfectants

LEAD108B-EQ (Unshielded Carbon Lead, 1.0–1.5 m)

Single-core 2.3 mm OD carbon-composition lead with radiolucent carbon snap and 1.5 mm touch-proof DIN 42802 socket

LEAD108C-EQ (Carbon-Screened Lead / Twisted Pair)

Carbon-polymer screened or tightly twisted dual-carbon differential pair for minimal gradient artefact in 3T/7T EPI sequences

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ASTM F2503 /ASTM F2182 / IEC 60601-2-33 / ANSI/AAMI EC53. Values for your order are confirmed in the datasheet and quotation.

Electrical

Distributed DC resistance
100 Ω/m ± 20 % (standard) or 300 Ω/m ± 20 % (high-damping)
Total lead resistance
100 Ω to 600 Ω (negligible vs ≥ 10 MΩ amplifier input)
Dielectric strength
1,500 V AC rms for 1 min (IEC 60601-1)
RF heating (ASTM F2182)
ΔT < 1.5 °C at 4 W/kg whole-body SAR (1.5 T & 3.0 T)
Image artefact (ASTM F2119)
Zero metallic blooming / < 1 mm spin-echo & GRE void

Thermal

Clinical operating range
+10 °C to +45 °C
Storage & cleaning temperature
−20 °C to +60 °C

Mechanical

Cable outer diameter
2.3 mm (single unshielded) · 3.4 mm (carbon-screened / twisted)
Electrode termination
All-carbon/polymer 3.9 mm snap or radiolucent micro-clip
Amplifier termination
1.5 mm female touch-proof safety socket (DIN 42802)
Flex life (ANSI/AAMI EC53)
≥ 25,000 swing cycles at strain relief
Tensile pull strength
≥ 35 N termination pull-off force

Resistance

Biocompatibility
ISO 10993-5 (cytotoxicity) & ISO 10993-10 (sensitization)
Disinfectant resistance
70 % IPA, Quaternary Ammonium, hospital surface wipes & 3 % H2O2
Latex & phthalate status
100 % natural-rubber-latex-free & DEHP-free

Reference standards

MR safety standards
ASTM F2503 · ASTM F2182 · ASTM F2119 · IEC 60601-2-33
ECG trunk/lead performance
ANSI/AAMI EC53 / IEC 60601-2-27
Safety connector standard
DIN 42802 / IEC 60601-1 touch-proof 1.5 mm

Identification

Jacket colour
Matte Charcoal Black with colour-coded AHA/IEC rings
MR marking
Permanent yellow 'MR CONDITIONAL' tag with length & R code
Customs tariff (HS)
9018.11 / 8544.42

Sizes

12 standard MR-conditional carbon-composition biopotential lead configurations

Compatible with BIOPAC MECMRI-BIOP / AMI100D, Brain Products, and clinical 1.5 mm DIN 42802 amplifier inputs.

Lead styles, lengths & DC resistance
Order designationLead Architecture & ShieldingElectrode EndLength
m		Unit R
Ω/m		Total R
Ω		Cable OD
mm		MR Field
Rating		Enquiry
LEAD108B Series — Unshielded Carbon-Composition Single Leads
MRC-LEAD108B-SNAP-060Unshielded 3K Carbon CoreCarbon Snap (3.9 mm)0.60110662.31.5T / 3T / 7T
MRC-LEAD108B-SNAP-100Unshielded 3K Carbon CoreCarbon Snap (3.9 mm)1.001101102.31.5T / 3T / 7T
MRC-LEAD108B-SNAP-150Unshielded 3K Carbon Core (LEAD108B std)Carbon Snap (3.9 mm)1.501101652.31.5T / 3T / 7T
MRC-LEAD108B-SNAP-200Unshielded 3K Carbon CoreCarbon Snap (3.9 mm)2.001102202.31.5T / 3T
MRC-LEAD108B-CLIP-150Unshielded 3K Carbon CoreRadiolucent Pinch Clip1.501101652.31.5T / 3T / 7T
MRC-LEAD108B-HR-150High-Damping 300 Ω/m Carbon CoreCarbon Snap (3.9 mm)1.503004502.33T / 7T / 9.4T
LEAD108C & Twisted Series — Carbon-Screened & Differential Pair Leads
MRC-LEAD108C-SCR-100Carbon-Polymer Screened CoaxCarbon Snap (3.9 mm)1.001201203.21.5T / 3T / 7T
MRC-LEAD108C-SCR-150Carbon-Polymer Screened Coax (LEAD108C std)Carbon Snap (3.9 mm)1.501201803.21.5T / 3T / 7T
MRC-LEAD108C-SCR-200Carbon-Polymer Screened CoaxCarbon Snap (3.9 mm)2.001202403.21.5T / 3T
MRC-LEAD108-TP2-1502-Lead Twisted Carbon Pair (Bipolar)2 × Carbon Snaps1.501101654.41.5T / 3T / 7T
MRC-LEAD108-TP3-1503-Lead Twisted Carbon Triad (+ / − / GND)3 × Carbon Snaps (R/W/B)1.501101655.01.5T / 3T / 7T
MRC-LEAD108-TP3-3003-Lead Twisted Carbon Triad (+ / − / GND)3 × Carbon Snaps (R/W/B)3.001103305.01.5T / 3T
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • To minimise gradient-switching loop pickup and RF heating inside the MRI bore, always route leads straight down the centre of the bore without coiling and use twisted-pair configurations where possible.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % DC end-to-end carbon resistance & continuity checkVerify distributed resistance within ± 15 % of nominal specificationEvery lead assembly
1,500 V AC dielectric withstand testZero breakdown through medical TPU jacket for 60 sEvery production lot
Sample tests
ASTM F2182 phantom RF heating test at 64 MHz (1.5T) & 128 MHz (3T)Temperature rise ΔT < 1.5 °C at electrode contact in gel phantomType qualification
ASTM F2119 gradient-echo & spin-echo susceptibility artefact testZero ferromagnetic distortion on 3.0 T EPI sequencesType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

ASTM F2503 / ASTM F2182 MR-Conditional VerifiedANSI/AAMI EC53 & ISO 10993 Biocompatible

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MRC-LEAD108 MR CONDITIONAL CARBON LEAD DIN 42802
Packaging
Clean medical pouch in colour-coded sets of 3, 5 or 10 leads
Colour coding
AHA (Red/White/Black/Green/Brown) or IEC (Red/Yellow/Black/Green)
Amplifier interface
Standard 1.5 mm DIN 42802 female safety socket or multi-pin trunk
Lead time
2–3 weeks ex-works

Technical documents

Downloads

PDFBIOPAC LEAD108B / LEAD108C MRI-Conditional Carbon-Composition – technical datasheet12 sizes · construction, technical data, approvalsXLSXBIOPAC LEAD108B / LEAD108C spec data (Excel)All 12 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why are carbon-composition conductors used instead of copper wires inside an MRI bore?
Copper wires have near-zero resistance and act as resonant half-wave dipole antennas at MRI Larmor frequencies (64 MHz at 1.5 T, 128 MHz at 3.0 T), concentrating RF electric fields at the electrode tip and causing severe patient skin burns. Carbon-composition filaments provide 90–350 Ω/m of distributed resistance that damps RF standing waves while matching the magnetic susceptibility of human tissue.
Does the 100–450 Ω lead resistance degrade ECG, EEG, or EMG signal amplitude?
No. Modern biopotential preamplifiers (such as BIOPAC MECMRI-BIOP or clinical MRI monitors) have input impedances exceeding 10 MΩ to 1,000 MΩ. A 200 Ω series lead resistance causes less than 0.002 % signal attenuation.
What is the difference between the LEAD108B and LEAD108C configurations?
LEAD108B is an unshielded single-core carbon-composition lead with a 2.3 mm OD for general MR-conditional recording. LEAD108C adds an extruded carbon-loaded conductive polymer outer shield (3.2 mm OD) to drain electric-field interference during rapid EPI gradient switching.
Are the electrode snaps also non-metallic?
Yes. Both the electrode snap housing and the conductive contact stud are moulded from glass-reinforced polymer and conductive carbon composite, so there is zero metal at the patient skin interface.

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BIOPAC LEAD108B / LEAD108C MRI-Conditional Carbon-Composition

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