| HS Code | 301885 |
| Density | 3.6 g/cm³ |
| Tensile Strength | 50 MPa |
| Tensile Modulus | 12000 MPa |
| Elongation At Break | 1.5 % |
| Flexural Modulus | 10000 MPa |
| Charpy Impact Strength Unnotched | 25 kJ/m² |
| Melting Point | 178 °C |
| Heat Deflection Temperature Hdt B | 150 °C |
| Vicat Softening Temperature | 160 °C |
| Melt Volume Rate 275 C 5 Kg | 10 cm³/10 min |
| Maximum Remanence Br | 250 mT |
| Coercivity Hcj | 200 kA/m |
As an accredited Barlog Plastics KEBABLEND M 76/67 PA12 for Plastic Bonded Magnets factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg moisture-proof polyethylene bags, palletized and shrink-wrapped for safe transport and storage of Barlog Plastics KEBABLEND M 76/67 PA12. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): One 20-foot container filled with Barlog Plastics KEBABLEND M 76/67 PA12, used for plastic bonded magnets, securely packed. |
| Shipping | The material is shipped as dried pellets in sealed, moisture-resistant bags on pallets to prevent contamination and humidity absorption. It is non-hazardous under transport regulations, suitable for standard road, sea, or rail freight. Keep dry, away from excessive heat, and protect packaging from damage during handling. |
| Storage | Store in a cool, dry area away from direct sunlight and heat sources. Keep the original packaging tightly sealed to prevent moisture absorption and contamination. Avoid exposure to humidity and extreme temperatures. Under proper conditions, the material remains stable and suitable for processing into plastic bonded magnets. |
| Shelf Life | Store dry, cool, in unopened original packaging. Shelf life: 2 years from date of manufacture. |
In compact multi-pole rotor assemblies for electronic throttle body position feedback, KEBABLEND M 76/67 is overmolded onto a stainless steel shaft or hub as an annular ring with typical outer diameter from 10 mm to 28 mm and wall thickness from 1.5 mm to 2.5 mm. The compound is pre-dried at 80°C for 4–6 h in a desiccant dryer with a dew point of -40°C or lower, reducing residual moisture below 0.08 wt% before plastication. Injection molding is carried out with a flat barrel temperature profile of 230–270°C, a mold temperature of 70–90°C, and a reciprocating screw with an L/D ratio of 20:1 to 25:1 and a free-flow non-return valve. The magnetic phase fraction is maintained at 72–76 wt%, the PA12 binder at 24–28 wt%, and an internal lubricant plus coupling system below 0.5 wt%; the as-supplied compound is not intended for external let-down, but if reduced remanence is required, addition of virgin PA12 carrier is limited to 2–3 wt% because higher dilution generates viscosity stratification and non-uniform pole flux after magnetization. After ejection, the ring is magnetized in a capacitor-discharge fixture with peak field strength between 2.5 T and 3.2 T across 24 poles, and the pole-to-pole arc error is verified on a Hall-probe scanning station to ±0.5° while radial runout is held to 0.05 mm total indicator reading. The compliance basis comprises EU RoHS 2011/65/EU Annex II, REACH Regulation (EC) No 1907/2006, ISO 16750-4 thermal cycling from -40°C to 125°C, and IATF 16949 production part approval requirements. The end product type is the integrated rotor-position sensing magnet ring inside an electronic throttle control actuator.
The practical upper service temperature in aqueous coolant is governed less by the NdFeB phase than by the PA12 matrix, because PA12 absorbs 1.4–1.5 wt% water at saturation under ISO 62, and at 90°C glycol-water contact this water uptake softens the binder and reduces force transfer between the chemical-resistant overmold and the magnetic ring. For canned rotor pumps and magnetic couplings that circulate domestic heating water or dishwasher drain water, the ring is insert-molded around a stainless steel shaft with an 8-pole or 12-pole configuration, using a barrel temperature of 230–250°C and a tool temperature of 60–80°C; higher melt temperatures are avoided because retained moisture plus iron-oxide surfaces promote hydrolysis and a measurable drop in melt viscosity. The formulation loading in this sector is set between 68 wt% and 72 wt% magnetic powder, with PA12 binder at 28–32 wt% and a hindered phenol-phosphite stabilizer package at 0.3–0.5 wt%, because the slightly reduced magnetic fraction maintains overmold adhesion and reduces the risk of cracking during press-fit rotor assembly. If processors dilute the as-supplied KEBABLEND M 76/67 with virgin PA12, the addition is limited to 3–5 wt%; beyond this boundary, the induction amplitude after 8-pole magnetization becomes unstable at the 0.5 mm air gap required by the Hall sensor. Compliance for these pump rotors is anchored to EU RoHS 2011/65/EU Annex II and REACH (EC) No 1907/2006, while continuous-immersion screening follows ISO 62 water absorption and ISO 527-2 tensile property retention; finished pump assemblies are additionally qualified under ISO 5199 for hydraulic performance. Published data for this specific compound under long-term coolant ageing is limited, so lot-specific validation is required for production release. The end product type is a canned rotor or magnetic coupling rotor used in residential circulator pumps and dishwasher drain pumps.
Miniature linear resonant actuators in mobile handsets require a magnetic component with wall thickness from 0.6 mm to 1.2 mm, and KEBABLEND M 76/67 is injection-molded into a rectangular bar or annular ring that is subsequently magnetized as a 2-pole or 4-pole moving mass. The process window centers on a nozzle temperature not exceeding 270°C because lighter sections are sensitive to NdFeB oxidation and surface silver streaking if residual moisture exceeds 0.05 wt%; pre-drying is performed at 80°C for 4–6 h in a desiccant dryer. Formulation loading is held at 74–76 wt% magnetic powder, 24–26 wt% PA12 binder, and 0.2–0.5 wt% antioxidant package; release agents are excluded from the additive system because any visible film on the magnet surface reduces adhesive bonding to the spring suspension. After molding, the component is magnetized at a peak field of 1.8–2.5 T, and the open-circuit flux is verified by Helmholtz coil measurement in accordance with IEC 60404-5; dimensional capability is monitored by optical projection at 0.02 mm resolution. The sector compliance frame includes EU RoHS 2011/65/EU Annex II, REACH (EC) No 1907/2006, IEC 62368-1 for audio-visual and information technology equipment, and IEC 61249-2-21 halogen-free requirements where specified. End product type is the moving magnet inside a linear resonant actuator for smartphone haptic feedback and wearable alerting modules.
The processing window narrows because the as-molded eccentricity of a PA12-bonded ring is influenced by gate location, packing pressure, and post-molding cooling rate rather than by magnetic filler content alone. For residential air-conditioning fan motors and air purifier BLDC rotors, the ring is insert-molded onto a shaft hub and then magnetized with 8 or 10 poles; the compound is pre-dried to 0.06 wt% residual moisture and processed at a barrel temperature of 245–255°C with a maximum deviation of ±5°C. Above this window, the NdFeB phase undergoes measurable oxidation in the presence of moisture; below it, the compound freezes at finger-like spoke sections and produces short shots in walls below 1.0 mm. The required formulation ratio is 74–76 wt% magnetic powder, 24–26 wt% PA12, and 0.3–0.5 wt% phosphate-based coupling agent; no external lubricant is added because it migrates to the shaft interface and reduces insert adhesion. Packing pressure is held at 60–80 MPa with a hold time of 8–12 s, and the mold temperature is set at 80–100°C so that the gate remains open long enough to compensate volumetric shrinkage of the thick magnetic section. After ejection and conditioning for 24 h at 23°C and 50% RH, the eccentricity is measured on a coordinate measuring machine and must remain below 0.05 mm before post-magnetization at 2.8 T. Compliance for this motor type is based on IEC 60335-1 for household appliance safety, EU RoHS 2011/65/EU Annex II, and REACH (EC) No 1907/2006. The end product type is a brushless DC rotor core for HVAC fan motors and air purification blowers.
For high-resolution servo feedback, the encoder ring is a flat annular disc with pole counts from 32 to 64, and the 76 wt% magnetic loading of the as-supplied KEBABLEND M 76/67 is retained because the disc contains short land areas rather than extremely thin spokes and because injection-compression molding prevents cavity freeze-off before fill completion. The downstream process uses a melt temperature of 240–260°C, a mold temperature of 85–95°C, and a compression stroke initiated after 90% cavity fill, with the compression force held until the gate freezes. The formulation ratio is 74–76 wt% magnetic powder, 24–26 wt% PA12 binder, and 0.2–0.4 wt% antioxidant system; no external lubricant is added because it migrates to the disc surface and changes the air-gap distance measured by the Hall sensor. After molding, the disc is magnetized in a 64-pole capacitor-discharge fixture at 2.5 T peak field, and pole-to-pole amplitude variation is measured on a scanning Hall probe; parts exceeding ±3% amplitude variation are rejected because the servo drive interprets the irregular flux as a commutation angle error. Compliance is governed by EU RoHS 2011/65/EU Annex II, REACH (EC) No 1907/2006, and IEC 61800-5-1 for adjustable speed electrical power drive systems where the encoder is integrated into a functional safety circuit. The end product type is a magnetic encoder ring for servo motor feedback and linear position sensing in industrial automation.
Miniature positive-displacement pumps for insulin delivery and surgical aspiration use a two-pole injection-molded rotor core in which KEBABLEND M 76/67 is fully encapsulated by a medical-grade PA12 or LCP overmold so that the magnetic phase is never in contact with tissue or drug solution. The production process is performed in an ISO 13485 cleanroom, with pre-drying at 80°C for 6 h to a residual moisture of 0.06 wt% or lower and a barrel temperature profile of 235–265°C; after molding, the rotor is dry-heat conditioned rather than solvent-cleaned because polar solvents can induce environmental stress cracking in thin PA12 sections. The formulation ratio is 72–76 wt% magnetic powder and 24–28 wt% PA12 binder, and the additive package excludes phthalates, silicone oils, and amine-based lubricants; no external processing aid is allowed unless it is listed in the device master record. Cytotoxicity screening is conducted according to ISO 10993-5, sensitization according to ISO 10993-10, and the PA12 carrier alone is not presumed to be biocompatible; the finished overmolded assembly must pass extraction testing because the magnetic core is a sealed internal component. EU RoHS 2011/65/EU Annex II remains applicable for electrical and electronic equipment constituents. The end product type is a two-pole rotor core inside a miniature positive-displacement pump for ambulatory infusion and surgical aspiration systems.
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Barlog Plastics KEBABLEND M 76/67 PA12 for Plastic Bonded Magnets is a polyamide 12 carrier compound formulated for the injection moulding of net-shape permanent-magnet components. The grade is supplied as ready-to-process granules in which magnetic filler particles are dispersed in a PA12 matrix. Typical components produced from PA12-bonded magnet compounds include sensor annuli, encoder discs, ABS tone wheels, e-bike motor rotor rings, flow-meter magnets, and pole segments for fractional-horsepower motors. The product does not require the sintering, grinding, or coating steps used for fully dense sintered magnets. Published data for the specific filler type and loading encoded by the designation M 76/67 is limited; the supplier’s certificate of analysis and lot datasheet should therefore be treated as the controlling specification for rheology, density, filler content, and magnetic performance. The material is not a direct replacement for sintered SmCo or NdFeB magnets where maximum energy product is required, because the PA12 binder dilutes the magnetic phase; however, it allows thin-walled, complex geometries and insert-overmoulded assemblies that are difficult to produce in rigid magnet grades.
Selection of the binder matrix changes moisture uptake, processing temperature, chemical resistance, and continuous-use thermal stability. PA12 has a lower equilibrium water absorption than PA6, which reduces dimensional variation in humid service environments. PA12 also has lower melt processing temperatures than PPS, but its continuous-use temperature is limited by oxidative ageing of the polyamide chain. In comparison to PA6, PA12 provides improved low-temperature impact behaviour and a lower coefficient of friction. In comparison to PPS, PA12 offers reduced energy input during processing and lower tool wear but lower creep resistance at elevated temperature. The table below presents unfilled matrix values; filled KEBABLEND M 76/67 values will increase in density and thermal conductivity depending on the magnetic filler type and volume fraction.
| Matrix | Density ISO 1183-1 (g/cm³) | Water absorption saturation ISO 62 (%) | Typical continuous-use range | Melt processing range |
|---|---|---|---|---|
| PA12 | 1.01–1.03 | 1.3–1.5 | 80–100 °C | 220–250 °C |
| PA6 | 1.12–1.14 | 9.0–10.0 | 85–120 °C | 240–280 °C |
| PPS | 1.34–1.36 | 0.02–0.05 | 200–240 °C | 300–340 °C |
The practical consequence for bonded magnets is that PA12-based grades such as KEBABLEND M 76/67 are preferred where components must survive cold weather in wet environments and where injection moulding at lower barrel temperatures reduces the risk of magnetic-powder oxidation. PA6 grades may be selected for lower raw-material cost and higher modulus, but their high saturation moisture content can shift dimensions and reduce electrical insulation after prolonged humidity exposure. PPS grades are selected for underhood sensors and components needing short-term exposure above 160 °C; PA12 is not suitable for continuous service at that temperature. The specific grade M 76/67 occupies the PA12 segment; exact discrimination against other KEBABLEND products should be obtained from the supplier’s product selector rather than inferred from the suffix alone.
At magnetic filler loadings above 85 wt%, the melt viscosity of PA12-bonded magnet compounds increases rapidly because particle-particle interactions replace melt-film lubrication. In ferrite-filled systems, typical remanence measured according to IEC 60404-5 falls within 250–300 mT, while NdFeB-filled systems can reach 700–900 mT depending on filler grade, loading, and orientation. The magnetic filler type also determines required magnetizing field strength and thermal demagnetization behaviour. For isotropic ferrite-filled grades, no in-mould magnetic alignment is required. For anisotropic NdFeB-filled grades, the melt must be exposed to an alignment field before solidification; the relatively low crystallization rate of PA12 allows a practical field-application window during filling and packing. Particle-size distribution is similarly important: ferrite powders commonly operate in the 1–10 µm range, while NdFeB powders may extend to 50–200 µm. Narrow distributions reduce melt-viscosity increase and improve magnetic alignment. Surface treatment of the magnetic powder with silanes or titanates improves wetting and reduces water penetration at the filler-binder interface. Residual moisture, filler agglomeration, and excessive melt temperature reduce mechanical integrity at that interface. The energy product of a plastic-bonded magnet remains below that of a sintered magnet of equivalent composition because the binder occupies non-magnetic volume. This limitation must be reflected in magnetic-circuit calculations; published data for the specific KEBABLEND M 76/67 configuration should be used for actual remanence, coercivity, and temperature coefficients.
Production-scale lines for PA12-bonded magnets use reciprocating-screw injection moulding machines with wear-resistant barrel, screw, and non-return-valve components. The screw should have a length-to-diameter ratio of 20:1 to 25:1 and a compression ratio of 2.0:1 to 2.5:1; higher compression ratios can damage shear-sensitive magnetic filler particles, while lower ratios reduce homogenization. Barrel set temperatures are normally set between 220 °C and 250 °C, with the nozzle held 5–10 °C below the front zone to prevent drooling. Mould temperature should be maintained between 60 °C and 90 °C to improve weld-line strength and reduce premature freeze-off. Because the compound is heavily filled, injection speed is often increased to reduce flow-front cooling; however, excessive speed may create shear heating and burn marks at vent locations. The following starting values are general for PA12-bonded magnet compounds and are not a substitute for lot-specific rheology data.
| Parameter | General starting range | Equipment/measurement note |
|---|---|---|
| Screw L/D | 20:1–25:1 | Wear-resistant flight lands |
| Compression ratio | 2.0:1–2.5:1 | General-purpose or low-shear screw |
| Barrel temperature | 220–250 °C | Not to exceed 260 °C |
| Mould temperature | 60–90 °C | Cartridge or water/oil thermoregulation |
| Gate diameter | 1.5–2.0 mm minimum | Round or trapezoidal gate |
| Vent depth | 0.015–0.025 mm | Peripheral vents on cavity perimeter |
| Projected-area clamp force | 2.0–2.5 t/cm² | Dependent on flow length |
Hot-runner valve-gate systems are used for multi-cavity sensor rings but require wear-resistant valve pins and nozzle tips because ferrite and NdFeB fillers are abrasive. Gate freeze time must be determined by sealing tests because the high filler content reduces melt compressibility, leading to faster pressure decay after switchover. Holding pressure is typically maintained at 50–80 MPa hydraulic or equivalent specific pressure, with switchover by screw position rather than time where possible. If anisotropic magnetic filler is used, the injection tool must include magnetizing coils and laminated inserts; the alignment field strength is filler-specific and is normally supplied by the magnetic-powder manufacturer. Capillary rheometry at 240 °C across shear rates from 102 s-1 to 104 s-1 should be used to transfer viscosity data to mould-filling simulation software.
Dimensional drift in production batches is most frequently caused by uncontrolled post-mould moisture uptake, not by filler distribution. PA12-bonded magnet compounds should be measured after conditioning, with dimensions referenced to 23 °C and 50% relative humidity according to ISO 291. Production lines with open granulate hoppers in facilities exceeding 60% relative humidity have shown increased reject rates due to surface splay and short-shot variation. Metal inserts, when overmoulded, should be preheated to 80–120 °C to avoid premature skin solidification at the metal-polymer interface. Magnetic filler can settle in the feed throat if the screw back pressure is too low; a back pressure of 5–10 bar hydraulic is commonly used to stabilize melt density without over-shearing. Screw torque spikes or non-return valve sticking indicate filler agglomeration or metallic contamination; such lots should be isolated and evaluated for particle-size distribution and moisture before further processing.
If granulate is not dried to residual moisture below 0.1% before plastification, hydrolysis of the PA12 matrix occurs at processing temperatures, producing surface splay, reduced tensile strength, and variable melt viscosity. Drying in a desiccant dryer at 80 °C for 4–6 h with return-air dew point −30 °C is a standard starting condition. Oven trays should be loaded to a pellet depth not exceeding 40 mm; deeper beds produce non-uniform drying. After drying, the granulate should not be exposed to ambient air for more than 20–30 min when ambient relative humidity is above 60%. Feed hoppers should be purged with low-dew-point air or nitrogen. Frozen granules should be conditioned to room temperature before feeding to avoid condensation on the pellet surface. Moisture analysis by Karl Fischer titration or a calibrated moisture analyser is preferred over weight-loss methods because PA12 can evolve other volatiles at high temperature.
Compliance status for KEBABLEND M 76/67 must be confirmed from the supplier’s safety data sheet and product datasheet. PA12-bonded magnet compounds can be formulated to meet RoHS 2011/65/EU Annex II restrictions for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE when suitable magnetic fillers and stabilizers are used. REACH compliance is possible under Regulation (EC) No 1907/2006 for the polymer and filler system if all substances are registered or exempt. No specific regulatory certification is implied by the product code alone; each customer must verify conformity against the material datasheet and contractual specifications. Operational boundaries include a continuous-use temperature limited by the PA12 matrix; excursions above 100 °C can accelerate oxidative embrittlement and reduce mechanical retention of magnetic filler. The compound should not be specified for immersion in strong acids, phenols, or polar solvents without testing to ISO 175. It is not intended for high-temperature traction-motor environments where demagnetization at 150 °C or above is determined by the magnetic powder rather than the polymer binder. Use with amine-based processing aids or certain metal salts can promote polyamide degradation and should be validated before compounding.
