KEBABLEND MW FE 190701 PA12 for Magnetic Components

What Processing Window Emerges When Ferrite Loading Exceeds 88 wt% in a PA12 Binder System?

Barlog Plastics KEBABLEND MW FE 190701 PA12 for Magnetic Components belongs to the class of PA12-bonded hard ferrite injection moulding feedstocks used for dense multipole magnet rings and sensor targets. Published data for this specific product configuration is limited, so the processing boundaries cited here are drawn from PA12 compounds carrying strontium ferrite at filler mass fractions between 86 wt% and 92 wt%. The compound is predried to a moisture content below 0.10 wt% by Karl Fischer titration according to ISO 15512:2019. Drying at 80 °C for a minimum of 4 h to 8 h in a desiccant dryer with a dew point of −40 °C or lower prevents hydrolytic degradation of the PA12 matrix and reduces surface blistering. The melt temperature is maintained between 230 °C and 250 °C at the nozzle. Higher temperatures above 260 °C increase the risk of low-molecular-weight volatiles from the binder and reduce melt strength. Injection machines with a screw diameter between 25 mm and 50 mm, a compression ratio of 1.5:1 to 2.0:1, and a barrel L/D ratio of 20:1 to 25:1 are used to limit filler-bed compaction. The check ring, screw tip, and barrel lining are specified as bimetallic or ceramic-hardened because strontium ferrite particles produce abrasive wear rates that are measurably higher than unfilled PA12. Mould temperatures between 70 °C and 110 °C are required to reduce premature skin freeze-off and to permit orientation-free packing of the cavity. If the mould surface drops below 60 °C, the visual weld line at the last melt confluence deepens and the local magnetic pole amplitude can deviate from the mean by more than 5%. Holding pressure is set as a function of gate geometry, but hydraulic pressure alone is not used as a process release criterion because the filler network transmits pressure differently than an unfilled PA12 melt. Injection velocity is profiled to keep the flow front continuous, with fast initial filling of 80–150 mm/s for thin rings followed by a reduced velocity at 95–98% switchover point. Back pressure is kept low, between 2 MPa and 5 MPa hydraulic, to avoid excessive shear heating and localized binder degradation. The process produces fully isotropic magnetic components; anisotropic alignment is not achieved in conventional injection moulding because no external magnetic field is applied during cavity filling.

In wheel-speed sensor target wheel manufacture, the compound is overmoulded onto a pre-ground AISI 52100 bearing ring that has been coated with a solvent-free thermoset adhesive or textured by laser ablation. The steel insert is heated to 120–150 °C before insertion into the tool to reduce solidification mismatch at the interface. The PA12-bonded magnet ring shrinks onto the steel core during cooling because the coefficient of linear thermal expansion of PA12 is in the range of 100–120 ppm/K, while bearing steel is approximately 12 ppm/K. This differential generates residual compressive stress in the polymer ring at room temperature. If the insert is cold, the polymer freezes against the metal before full packing is achieved and interlaminar separation may occur during magnetization or press-in assembly. The overmoulding tool uses a vertical clamp force of 800–1,800 kN for typical outer diameters from 60 mm to 120 mm. Multi-cavity layouts are avoided when pole pitch is below 1.5 mm because cavity-to-cavity flow imbalance produces unacceptable pole amplitude scatter. The gate is located as a fan gate on the inner diameter or as a ring gate around the hub, not as a single pinpoint gate, because radial melt flow around the full circumference provides more uniform filler distribution. After ejection at 60–80 °C, the component is annealed at 140–160 °C for 2 h in air to relax moulded-in stress and to stabilize geometry before magnetization. Dimensional inspection uses optical coordinate measurement with a tolerance band of ±0.05 mm on the magnetically active outside diameter. A post-moulding water absorption test according to ISO 62:2008 is applied at 23 °C to confirm that moisture uptake remains below 0.8% after 24 h, because higher water absorption shifts the electrical and dimensional response of the sensor target.

Multipole Encoder Ring Magnetisation Jigs and Pole-Pitch Verification

Encoder rings with axial or radial magnetisation are magnetized in a capacitor-discharge impulse station using a fixture that imposes the required pole count directly above the polymer surface. The magnetizing field must exceed the intrinsic coercivity H_cJ of the hard ferrite filler; for strontium ferrite grades, H_cJ typically falls between 250 kA/m and 350 kA/m. The fixture current pulse is tuned so that the air-gap field reaches 1.5–2.0 times H_cJ, and the pulse rise time is kept below 100 µs to suppress eddy current losses in the conductive steel carrier. Each magnetized ring is inspected with a Hall probe array that samples the surface normal component at 0.2° or smaller rotary increments. The acceptance criterion is commonly expressed as a maximum harmonic distortion limit on the dominant pole pair, with the second through fifth harmonics each held below −20 dB relative to the fundamental. Rejected parts cannot be repaired by simple re-magnetization if the pole pattern has shifted during ejection or annealing; they require demagnetization above the Curie temperature or mechanical recycling. The magnetic inspection data is linked to mould cavity number and shot counter so that pole amplitude drift can be separated from tool wear and filler-batch variation. When the process is stable, pole amplitude standard deviation across a 500-shot production run is held below 2% of the mean. Published data for this specific Barlog KEBABLEND MW FE 190701 grade is not publicly available at the time of writing, so the values above are derived from equivalent PA12-bonded ferrite magnet systems.

Control area	Standard or test method	Common target for PA12-bonded ferrite components
Drying verification	ISO 15512:2019	<0.10 wt% moisture before moulding
Melt-flow consistency	ISO 1133-1:2022	ΔMVR <5% between lots
Tensile property	ISO 527-2:2012	Report elongation at break and modulus after conditioning
Flexural property	ISO 178:2019	Report flexural modulus at 23 °C
Dimensional stability	ISO 294-4:2018	Post-mould shrinkage 0.3–0.8% depending on filler loading
Magnetic response	IEC 60404-8-1:2015	Surface field via Hall probe; harmonic distortion limit

Control area

Standard or test method

Common target for PA12-bonded ferrite components

Drying verification

ISO 15512:2019

<0.10 wt% moisture before moulding

Melt-flow consistency

ISO 1133-1:2022

ΔMVR <5% between lots

Tensile property

ISO 527-2:2012

Report elongation at break and modulus after conditioning

Flexural property

ISO 178:2019

Report flexural modulus at 23 °C

Dimensional stability

ISO 294-4:2018

Post-mould shrinkage 0.3–0.8% depending on filler loading

Magnetic response

IEC 60404-8-1:2015

Surface field via Hall probe; harmonic distortion limit

If Rotor Position Sensor Carriers Are Moulded with PA12-Bonded Soft Magnetic Feedstocks, What Chipping and Gate Vestige Controls Apply?

Rotor position sensor carriers for 48 V mild-hybrid motors and electric power steering units are frequently moulded with PA12 compounds containing soft magnetic iron or nickel-zinc ferrite fillers rather than hard ferrite. The target carrier wall thickness is often between 1.2 mm and 2.5 mm, and the flow length-to-thickness ratio exceeds 200:1 in multi-pole ring geometries. This creates a narrow processing channel in which melt temperature must remain above 240 °C for filling, while residence time must be kept below 8 min to limit binder decomposition. Hot-runner valve gates are used instead of cold sprue direct gates because the frozen gate vestige must be less than 0.05 mm above the surrounding surface to avoid interference with the sensor pick-up gap. The gate land length is held at 0.6–1.0 mm and the gate diameter is matched to the wall thickness to reduce filler-particle fracture at the gate restriction. Filler particles smaller than 100 µm are preferred for thin walls because larger particles increase the probability of edge chipping during ejection and press-fit. Mould release is set with a draft angle of 0.5°–1.0° on the inner bore and a polished ejection pad rather than small-diameter ejector pins, which produce localized chip-outs at the brittle magnet ring edge. The component is inserted onto a rotor shaft by controlled axial force; the maximum press-in force is validated at 23 °C and after thermal conditioning at 150 °C for 2,000 h according to ISO 527-2:2012 tensile property retention testing on plaques. PA12 provides resistance to automotive transmission oils and salt spray, but the compound is not compatible with concentrated organic acids or prolonged contact with methanol-based coolants above 80 °C.

Where PA12-bonded magnetic fillers are used as near-field communication antenna substrates or inductive charging coil carriers, the dominant failure modes are not mechanical fracture but eddy current heating and adhesive debonding at the filler–binder interface. The soft magnetic filler is selected with high electrical resistivity to reduce core loss; manganese-zinc ferrite is generally avoided because its lower volume resistivity promotes circulating currents in the frequency range from 100 kHz to 13.56 MHz. Nickel-zinc ferrite or iron-powder variants with an insulating phosphate or silane surface coating are preferred. The compound is moulded into flat covers with thickness from 0.5 mm to 1.5 mm using a hot-runner edge gate and a film gate width equal to 60–80% of the part width. This layout minimizes filler orientation parallel to the flow direction, which would otherwise introduce anisotropy in the real part of the magnetic permeability. Measured magnetic property stability is evaluated after ageing in 85 °C and 85% RH for 1,000 h; the acceptance limit is a shift of less than 10% in relative permeability at 1 MHz. The test method follows IEC 62044-3:2000 for soft ferrite material measurement concepts where applicable, although the composite polymer matrix requires a normalised air-gap correction. The part must also pass REACH SVHC screening and RoHS Directive 2011/65/EU Annex II restrictions; lead in the filler coating is not permitted above 0.1 wt% in homogeneous material. The injection moulding cell is equipped with a closed-loop material dryer because PA12 reabsorbs moisture at a rate that can exceed 0.05 wt% per hour at 50% RH, and changes in moisture alter both viscosity and adhesion to metal inserts.

Optimising Encapsulated Coil Geometries with PA12-Bonded Magnetic Feedstocks

Industrial solenoid bobbins, pneumatic valve actuator magnets, and linear position sensor components are overmoulded or moulded from PA12 magnetic compounds when the assembly must tolerate mineral oil, phosphate ester hydraulic fluid, and zinc-chloride road salt. The bobbin body is moulded with a wall thickness of 1.5–3.0 mm and then inserted into a solenoid housing; the magnetic insertion is done after coil winding when coil-heating during overmoulding is not permitted. The PA12 compound is moulded at 230–250 °C, but the coil assembly is preheated only to 80 °C to avoid damaging the wire insulation class. The tool is designed with a shut-off around the connector pin area to prevent flash into the electrical termination zone. Injection velocity is reduced to 30–60 mm/s in the connector pin area to avoid wire sweep and insert displacement. After moulding, the part is tested for pull-out force of the encapsulated coil wire, with minimum pull-out force set at 50 N per terminal. Dimensional stability is checked after thermal cycling from −40 °C to 150 °C for 500 cycles; the linear shrinkage after cycling must remain below 0.3%. PA12 absorbs low levels of moisture and retains tensile strength after oil ageing, but it is not rated for continuous exposure above 125 °C without generating surface chalking and eventual embrittlement. The magnetic filler content is adjusted to balance actuator pull force and mechanical toughness; a higher filler mass fraction increases magnetically generated force but reduces elongation at break below 1.5%, which is measured by ISO 527-2:2012. Published data for the exact Barlog KEBABLEND MW FE 190701 version is limited, and end users are advised to run a 24 h mould trial with start-up scrap separation to establish machine-specific barrel wear and magnetisation scatter before releasing the process for series production.

Introduced as a polyamide 12–based magnetizable compound for injection-moulded magnetic components, KEBABLEND MW FE 190701 is specified where an iron-bearing filled PA12 provides lower moisture-affected property shift than PA6 or PA66 and better low-temperature impact than PPS. The grade belongs to the Barlog KEBABLEND series; the MW modifier identifies the magnetically filled product line, and the FE designation indicates an iron-based filler system. The PA12 carrier reduces equilibrium water absorption to approximately 1.5 % under ISO 62, compared with 9–10 % for PA6 and 7–8 % for PA66. The material is intended for injection-moulded rotors, encoder rings, sensor targets, and flux-carrying housings. Product-specific datasheet values for KEBABLEND MW FE 190701 depend on filler loading and surface treatment; published third-party figures for this exact configuration are limited. Processing values in this document refer to the class of magnetically filled PA12 compounds unless the supplier datasheet states otherwise.

Why is magnetic filler orientation the principal processing variable in this PA12 compound?

In a magnetically filled thermoplastic, flow-induced orientation of iron-bearing particles determines the anisotropy of remanence, coercivity, and flux distribution in the moulded part. Near the mould wall, shear stresses produce a frozen oriented layer; in thicker cores, lower shear permits random or transverse alignment. Gate position, wall thickness, injection velocity, and mould temperature therefore control the final magnetic axis more than the base polymer alone. For anisotropic fillers, orientation along the flow direction can increase remanence in that axis and reduce remanence in the orthogonal plane. Multipole magnetization of encoder rings exposes this effect directly: if melt flow near the gate produces circumferential orientation while the magnetizing fixture applies a radial field, the measured flux amplitude decreases and the pole waveform may become asymmetrical. Bonded magnet compounds of this class often carry filler loadings above 50 % by mass; the high filler volume increases viscosity and reduces melt compressibility. Magnetic acceptance tests are usually performed under IEC 60404-5 or ASTM A977/A977M. Production lines should verify that the magnetizing peak field exceeds the intrinsic coercivity of the filler by a factor suitable for the target pole spacing; otherwise a partially saturated component can pass dimensional inspection and still fail flux-density testing.

Drying prior to melt processing remains a critical control parameter. Magnetically filled PA12 compounds accumulate moisture at the polymer–filler interface even when bulk PA12 moisture uptake is low. Residual moisture above 0.1 % promotes hydrolytic chain scission, inconsistent melt viscosity, and splay at the gate. A closed-loop desiccant dryer with a dew point below −30 °C and an air temperature of 80–100 °C is used for material of this class. Dwell time is typically 4–8 h depending on initial moisture, hopper loading, and granule shape. If ambient relative humidity exceeds 60 %, hopper residence time should be limited and the material should not be returned to storage after extended exposure unless re-drying is carried out under controlled conditions. The exact moisture limit for KEBABLEND MW FE 190701 should be taken from the supplier processing guide; the 0.1 % figure is the commonly accepted upper limit for filled PA12 melt processing.

In continuous production, the iron-bearing filler in KEBABLEND MW FE 190701 is abrasive to unprotected screw, check ring, barrel, and nozzle surfaces. The plasticising unit should have an L/D ratio of at least 20:1, a hardened screw flight and check ring, and if possible a bimetallic barrel. A three-zone screw with a compression ratio between 2:1 and 2.5:1 is used for semi-crystalline polyamides. Screw speed should be limited to avoid excessive viscous heating; peripheral screw speeds for filled PA12 injection moulding are commonly 0.1–0.3 m/s. A reverse-taper nozzle or shut-off nozzle is preferred to prevent drool and filler stagnation. Hot runner systems can be used only if manifold and tip clearances are sized for abrasive compounds; dead spots in hot runners can cause binder degradation and filler separation. Batch-to-batch variation in magnetic filler density and particle size distribution should be monitored through ash content under ISO 3451-1 and by apparent density measurement of the dry granulate; this prevents drift in shot weight and flux output.

Gate Freeze, Multipole Magnetization, and Dimensional Tolerance Stack

Gate freeze time in a 2 mm wall section of a semi-crystalline PA12 compound determines the amount of packing transferred into the cavity after flow stops. A magnetically filled PA12 can freeze its gate within 1.5–3 s at mould temperatures between 60 °C and 100 °C; hold pressure after gate seal adds little to density but may still influence warpage through mould constraint. Dimensional tolerance stacks for encoder rings and rotor cores require balanced shrinkage in the axial and circumferential directions. The magnetic filler reduces shrinkage of the base resin but introduces flow-direction dependence. ISO 294-4 should be used to measure shrinkage on a reference plaque, while polar coordinate measurements on the actual moulding are required for multipole magnetized parts because flux peaks are sensitive to local wall-thickness variation. Gate placement on an outer diameter can orient filler circumferentially and assist radial magnetization, but creates a weld line at the melt junction. Weld lines in highly filled magnetic compounds represent local filler depletion and can produce magnetic dead zones that are not visible optically; magnetic flux scanning or magneto-optical imaging is used to detect such zones before assembly.

After demoulding, components are magnetized in a fixture matched to the pole count and geometry. Capacitor-discharge magnetizers with air gaps below 1 mm between fixture pole faces and part surface are used to reduce the field intensity required for saturation. For ferrite-filled PA12 grades of this class, peak fields in the range of 800 kA/m to 2000 kA/m are common; rare-earth-filled compounds may require higher fields depending on intrinsic coercivity. Incomplete saturation produces lower open-circuit flux and poorer thermal stability of the remanent state. The magnetizing pulse duration, often in the 0.5–5 ms range for capacitor-discharge units, must be longer than the eddy-current screening time of the filler network if conductive or metal-alloy particles are present. Because the FE designation points to an iron-bearing filler system, the magnetizing fixture and pulse settings should be qualified on sample parts using a Helmholtz coil and fluxmeter according to IEC 60404-5, with polarity reversal to check for axisymmetric pole alignment. Published product-specific saturation data for KEBABLEND MW FE 190701 is limited; therefore, the supplier should provide magnetization curves if the part is used in a safety-relevant sensor circuit.

Observed production issues with magnetically filled PA12 include check-ring leakage, nozzle drool, gate blush, and flux amplitude drift after moisture conditioning. Check-ring leakage is addressed by using hardened, close-clearance non-return valve assemblies and by verifying cushion stability during run. Gate blush is minimized by reducing melt temperature, increasing gate diameter, or reducing injection acceleration. Flux amplitude drift after climate cycling often arises from dimensional swelling of the carrier rather than demagnetization; post-conditioning flux measurements under 85 °C/85 % RH for 500 h can separate reversible humidity effects from true irreversible magnetic ageing.

Rheological data for magnetically filled PA12 compounds frequently show pronounced shear thinning. When injection speed is increased from 50 mm/s to 150 mm/s, cavity pressure at the gate may not increase linearly because filler particles orient and the continuous PA12 matrix exhibits pseudoplastic behaviour. Capillary rheometry under ISO 11443 should be used to generate viscosity curves at the intended melt temperature range of 220–260 °C. The pressure–volume–temperature relationship should also be obtained for packing simulation; high filler loading reduces specific volume change but increases thermal conductivity, so cooling time can be shorter than for an unfilled PA12 part of the same wall thickness. Part ejection is nevertheless constrained by the lower elongation at break of the filled compound. Draft angles below 0.5° are not recommended for magnetic filler compounds because release forces increase with filler surface roughness and can lead to microcracks at the gate or weld line after ejection.

Mechanical acceptance testing on moulded parts follows ISO 527-1/-2 for tensile modulus and ISO 179-1/1eA for notched Charpy impact using dry-as-moulded specimens. Because PA12 absorbs moisture, conditioning under ISO 291 standard atmosphere 23 °C/50 % RH changes impact and flexural values; test reports should state the conditioning history. For magnetic components, dimensional metrology should be performed before magnetization because magnetized parts attract and repel steel gauges, producing non-repeatable readings. If dimensional inspection must occur after magnetization, non-magnetic or ceramic tooling and optical measurement are required. The supplier may report filler content as ash residue under ISO 3451-1; final part density can be checked by water displacement under ISO 1183-1 only if the part surface is sufficiently non-porous.

Test methods commonly applied to magnetically filled PA12 compounds
Property	Standard or method	Typical condition / unit
Density	ISO 1183-1	g/cm³
Tensile modulus	ISO 527-1/-2	MPa
Flexural modulus	ISO 178	MPa
Charpy impact, notched	ISO 179-1/1eA	kJ/m²
Heat deflection temperature	ISO 75-2	°C at 1.8 MPa
Water absorption	ISO 62	% after 24 h or saturation
Moulding shrinkage	ISO 294-4	% flow / transverse
Magnetic properties	IEC 60404-5, ASTM A977/A977M	remanence, coercivity, energy density
Ash content / filler loading	ISO 3451-1	% by mass
Melt volume-flow rate	ISO 1133-1	cm³/10 min; condition specified by supplier

When PA12 replaces PPS or PA6 in encoder target carriers

In encoder target carriers, the binder polymer influences moisture-induced expansion, moulded-in stress, and the low-temperature impact response of a magnetically filled part. PA12 provides lower water absorption and better dimensional stability in humid engine-bay or chassis environments than PA6 or PA66, but its continuous-use temperature is lower than that of PPS. This makes the material more suitable for applications in which the service temperature stays below approximately 100 °C to 120 °C, whereas PPS is selected for temperatures above 180 °C. The difference from an unfilled PA12 is pronounced: the magnetic filler raises density, raises modulus, reduces elongation at break, and lowers tool wear tolerance. Compared with a PA6-bonded ferrite compound, the PA12 matrix reduces moisture uptake and therefore reduces the risk of dimensional growth and flux signal drift after humidity cycling. Compared with a PPS-bonded magnet, the PA12 formulation usually shows higher elongation at break and lower brittleness, which can reduce edge chipping during automated assembly, but the supplier datasheet must be used to confirm whether this specific KEBABLEND grade meets the required heat-ageing and flux-stability limits.

Comparative matrix of binder polymers for injection-moulded magnetic components
Matrix	Water absorption, ISO 62	Typical continuous-use temperature	Shrinkage behaviour, ISO 294-4	Application boundary
PA12	1.5 % saturation	100–120 °C	moderate; lower moisture-induced growth	humid environments requiring impact resistance
PA6	9–10 % saturation	100–120 °C	higher moisture-induced dimensional change	cost-sensitive dry applications
PA66	7–8 % saturation	120–140 °C	moderate to high moisture-induced change	elevated temperature under low humidity
PPS	0.1 % or less	200–220 °C	low, anisotropic at high filler loading	high-temperature and aggressive chemical exposure

From a regulatory standpoint, PA12-based magnetizable compounds for automotive or industrial sensor components are normally assessed against REACH Article 33 notification duties and RoHS Directive 2011/65/EU Annex II restricted substances, with special attention to lead, cadmium, and chromium in iron-bearing filler streams. The supplier should provide an IMDS declaration and the material-specific safety data sheet. The product is not intended for direct food-contact use unless explicitly certified under FDA 21 CFR or equivalent; magnetic fillers and processing aids can affect migration, and PA12 base resin compliance does not automatically extend to the filled compound. For electrical equipment safety, bondable magnetic parts used near air gaps or rotating shafts should be evaluated for dielectric strength under IEC 60243-1 if the part acts as an insulator, and for tracking resistance under IEC 60112 if conductive filler or surface contamination is present. End-use qualification under the relevant sensor or actuator specification should include humidity cycling, thermal shock, and flux stability testing after magnetization.

Упаковка	Supplied as 25 kg sealed polyethylene bags, 40 bags per pallet (1000 kg total), for magnetic components.
Погрузка контейнера (20-футовый контейнер)	20' FCL loading of Barlog Plastics KEBABLEND MW FE 190701 PA12, secured for safe transport of magnetic component material.
Доставка	Ship as non-hazardous plastic compound in sealed, moisture-proof packaging. Avoid direct sunlight and high temperatures. Secure pallets to prevent shifting. Ensure labeling includes product name, batch number, and safety data sheet reference. Handle with care to prevent contamination, and store dry until use.
Хранение	Store in original, unopened packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, and moisture. Ideal temperature range is 15–30°C. Ensure containers are tightly sealed when not in use to prevent contamination or water absorption. Use within manufacturer-recommended shelf life for optimal performance in magnetic component processing.
Срок годности	Shelf life is 12 months from manufacture if stored unopened, dry, and at room temperature.

Продукты

Barlog Plastics KEBABLEND MW FE 190701 PA12 for Magnetic Components

What Processing Window Emerges When Ferrite Loading Exceeds 88 wt% in a PA12 Binder System?