| HS Code | 807612 |
| Base Polymer | PA12 (Polyamide 12) |
| Filler Type | Mineral/barium sulfate |
| Filler Content | 75% by weight |
As an accredited LATI Latimass 75/4-04 D009 PA12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LATI Latimass 75/4-04 D009 PA12 is supplied in 25 kg sealed multi-layer paper bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20' FCL loading of LATI Latimass 75/4-04 D009 PA12 pellets, securely packed in bags on pallets, optimized for safe transport. |
| Shipping | Shipping description: Polyamide 12 (PA12) compound in granular form, non-hazardous for transport. Supplied in sealed moisture-resistant bags on pallets. Keep dry, avoid excessive heat and prolonged UV exposure. Not regulated under ADR/IMDG/IATA; suitable for standard dry freight with normal handling precautions. |
| Storage | Store LATI Latimass 75/4-04 D009 PA12 in its original, sealed container in a cool, dry, well-ventilated area. Protect from direct sunlight, moisture, and heat sources. Keep away from oxidizing agents. Ideal temperature: room temperature. Reseal any partial bags immediately. Under proper conditions, shelf life is typically several years. |
| Shelf Life | Store in original, unopened packaging in a cool, dry place. Shelf life is typically two years from production date. |
The PA12-based shielding compound LATI Latimass 75/4-04 D009 is a pre-compounded tungsten-loaded granulate supplied for injection molding and machining. Supplier literature identifies the grade by a nominal density of 4.04 g/cm³; exact lot density should be confirmed by ISO 1183-1:2019 Archimedes or gas pycnometry. Attenuation properties are thickness-, photon-energy-, and processing-dependent and must be confirmed on molded plaques according to IEC 61331-1:2014. Downstream addition ratios in shielding zones are normally 100 wt% because the compound is not a masterbatch; dilution is not a routine formulation variable and requires explicit lead-equivalence revalidation. If granulate is exposed to ambient relative humidity above 60% for more than 24 h, re-drying before molding is required because moisture uptake can cause surface splay and inconsistent filler dispersion in the melt.
For a CT gantry collimator blade, the relevant safety and radiation protection framework begins with IEC 60601-1:2005/AMD1:2012 for basic safety and IEC 60601-1-3:2008/AMD1:2013 for radiation protection of diagnostic X-ray equipment. Attenuation equivalence of the molded material is determined by the lead-equivalence method in IEC 61331-1:2014; final device validation must be performed on plaques and finished part thicknesses over the field of view. In these shielding zones, the downstream addition ratio is 100 wt% as-supplied. No dilution with unreinforced PA12 is permitted because shielding is a mass-thickness function and any let-down would require complete re-mapping of attenuation curves over the relevant kVp range. Injection molding processing starts with desiccant drying to residual moisture below 0.10% by ISO 15512:2019, a barrel profile of 220–255 °C, mold temperature 60–80 °C, screw speed 50–90 rpm, and back pressure 0.3–0.8 MPa. Wear-resistant barrel, screw, check ring, and hardened ejector pins are specified because the filler is abrasive; a gate diameter below 1.5 mm is avoided because high-density melt has limited flow length and sharp corners can induce jetting and non-uniform filler distribution. Tool steel hardness should be above 52 HRC or coated with hard chrome; ejector pins are polished to prevent pull-out from tungsten-rich surfaces. Regrind from this grade may be re-introduced at up to 20 wt% in non-shielding regions only; in shielding zones, regrind segregation can alter filler distribution and lead-equivalence homogeneity. Terminal components molded from this grade include CT collimator blades, anti-scatter grid septa, detector collimator supports, and gantry shielding inserts.
| Standard designation | Application-specific requirement | Test boundary |
|---|---|---|
| IEC 61331-1:2014 | Attenuation ratio and lead equivalence | Diagnostic X-ray collimator blades, 70–150 kVp |
| IEC 60601-1-3:2008/AMD1:2013 | Radiation protection for diagnostic X-ray equipment | Gantry beam limiting device |
| IEC 60601-1:2005/AMD1:2012 | Basic safety and essential performance | Medical electrical equipment enclosure |
| ISO 10993-1:2018 | Biological evaluation | Surface-contact, non-patient-invasive |
| ISO 15512:2019 | Residual moisture | Granulate before molding, <0.10% |
| REACH Regulation (EC) No 1907/2006 | Article 33 SVHC communication | EU article supply chain |
| RoHS Directive 2011/65/EU | Annex II substance restrictions | Electrical/electronic equipment components |
Brachytherapy source handling trays manufactured for sealed-source preparation and transfer in radiotherapy departments face a dual constraint: photon attenuation and cleanability after surface contamination. Molded trays from the PA12 high-density compound are specified at 100 wt% as-supplied; metal inserts for latch and hinge points are placed into the tool cavity before injection rather than using flow-enhancing dilution. The production process is low-pressure injection-compression molding with tool temperature 70–80 °C and holding pressure maintained for 20–30 s on sections thicker than 6 mm to avoid sink over the tungsten-rich melt. Post-mold annealing at 80 °C for 2 h in a nitrogen-blanketed oven reduces residual stress and improves dimensional stability after gamma sterilization at 25 kGy; color shift may occur at higher absorbed doses, and published repeated-sterilization data for this specific grade is limited. Compliance for these handling accessories follows ISO 10993-1:2018, ISO 13485:2016, and IEC 61331-1:2014 attenuation measurement where the tray functions as a primary shielding barrier during manual source transfer. Terminal products include LDR/HDR brachytherapy preparation trays, forceps holders, seed loading blocks, and shielded source transfer containers for in-room logistics.
Because the shielding function in carry-on baggage CT explosives detection systems is split between source containment, gantry radiation shielding, and detector aperture, PA12-based tungsten-loaded compounds are used where complex snap-fit geometries, grounding tabs, or low-friction detector guides cannot be fabricated in cast lead or steel. The downstream addition ratio is 100 wt% in injection-molded shielding panels of 4–10 mm thickness; panel thickness, not let-down, is the attenuation control variable. Molding is performed on horizontal injection molding machines with clamp force typically 2,000–5,000 kN for frames up to 800 mm length, melt temperature 240–250 °C, and mold temperature 60–70 °C. Because high-density melt solidifies quickly against cold tool steel, sequential valve-gated injection is used to avoid knit lines near detector apertures. Compliance for security screening equipment includes IEC 61010-1:2010 and lead-equivalence tests based on IEC 61331-1:2014 methodology adapted to security spectra; final certification remains with the equipment OEM. Terminal products include baggage scanner side panels, detector tunnel collars, source housing covers, and installation trim that contributes to stray-radiation reduction.
Radiopharmacy hot cells that handle 511 keV annihilation photons from PET isotopes define shielding thicknesses that often exceed the practical injection-molding envelope for this grade; therefore, the PA12 compound is used as a secondary shield and handling accessory rather than a primary hot-cell wall. In low-energy 140 keV Tc-99m settings, the material is machined from compression-molded block stock into vial shields, syringe shields, and source parking blocks. The downstream addition ratio is 100 wt% as-received; CNC machining is specified when lot-to-lot thickness must be held within ±0.05 mm. Machining uses carbide or polycrystalline diamond tools dry, without coolant, to avoid moisture absorption and tool-chip adhesion; post-machining cleaning with anhydrous ethanol is allowed, but ultrasonic cleaning above 40 °C may open surface microvoids. Radiation protection testing uses narrow-beam geometry based on IEC 61331-1:2014 and reference radiation fields per ISO 4037-1:2019. Terminal products include Tc-99m generator shielding inserts, vial shields, syringe barrels, and transport pig liners for internal laboratory logistics.
Under ISO 3999:2004, portable industrial gamma radiography devices using Ir-192 or Se-75 sources are regulated, and the source path collimator is typically manufactured from tungsten heavy alloy. A tungsten-filled PA12 compound is used for non-primary collimator components where complex geometry or electrical isolation is required. The addition ratio is 100 wt% for injection-molded collimator housings and guide tube adapters; overmolding onto stainless steel source guide tubes is performed at melt 235–245 °C, with the metal insert preheated to 100–120 °C to prevent premature skin freezing. No mold release should be used because trace residues can migrate and reduce adhesion between the PA12 matrix and the insert. Post-mold dimensional inspection follows ISO 2768-1:1989 general tolerances unless the drawing specifies tighter source-path geometry. Published long-term aging data for this grade under continuous gamma fields above 10 kGy absorbed dose is limited; components near the source path require periodic replacement intervals based on operational dose monitoring. Terminal products include exposure device handle shields, source guide tube collars, remote crank covers, and storage pig feet.
Extraoral dental panoramic and cephalometric units are subject to IEC 60601-2-63:2012/AMD1:2017 for leakage radiation and beam-limiting device performance. Tungsten-loaded PA12 housings are injection molded at 100 wt% in shielding zones; in two-shot assemblies the shielding core is overmolded with unfilled PA12 only outside the primary beam path, and any overmolding thickness in the beam path must be included in the lead-equivalence test. Processing uses a mold temperature of 50–60 °C, lower than diagnostic CT parts, to reduce post-mold crystallization differences in thin cosmetic walls; a desiccant dryer set to 80 °C for 4–6 h is still required. Because dental systems are exposed to repeated disinfectant wipes, the PA12 matrix offers lower moisture uptake than PA6, but quaternary ammonium and alcohol-based disinfectants can initiate stress cracking on highly filled surfaces; validated wipe protocols per ISO 17664-1:2017 are required for reusable device surfaces. Terminal products include panoramic C-arm covers, cephalometric sensor housings, and intraoral X-ray tube sleeve supports.
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LATI Latimass 75/4-04 D009 PA12 is a high-density polyamide 12 compound used where mass, dimensional stability, and moulded-in geometry are required simultaneously. The 75/4-04 designation is a manufacturer-specific code within the LATI Latimass range; D009 identifies the filler and additive variant. Unfilled PA12 has a density of approximately 1.01 g/cm³ when tested to ISO 1183-1; the filled compound is significantly higher and must be verified against the current technical datasheet. The polymer matrix is semicrystalline and absorbs less water than PA6 or PA66 under ISO 62 conditioning at 23 °C and 50 % RH.
Typical use cases include injection-moulded counterweights, radiodense housings, vibration masses, and acoustic damping components. These applications exploit the high filler loading to increase part mass without external metal weights. The material can integrate snap-fits, bosses, ribs, and cable channels directly into the moulded geometry, reducing secondary machining operations associated with cast metal. However, the filler changes melt rheology and solidification behaviour; processing parameters for unfilled PA12 are not transferable to this grade.
| Property | Standard | Equipment | Relevance |
|---|---|---|---|
| Density | ISO 1183-1 | Archimedes balance or gas pycnometer | Controls mass and radiation attenuation |
| Filler content | ISO 3451-1 | Muffle furnace, 600 °C | Verifies lot-to-lot consistency |
| Tensile modulus | ISO 527-1/2 | Universal testing machine, 1 mm/min | Feeds finite-element material cards |
| Charpy impact | ISO 179-1/1eU | Pendulum impact tester | Unnotched geometry preferred for filled compounds |
| Melt volume-flow rate | ISO 1133-1 | Extrusion plastometer | Detects degradation or filler-induced viscosity shift |
| Residual moisture | ISO 15512 | Karl Fischer titrator | Prevents hydrolysis and surface splay |
Polyamide 12 absorbs less water at equilibrium than polyamide 6 or polyamide 66, which reduces the post-moulding density decrease and dimensional change in humid service environments. Under ISO 62 conditioning at 23 °C and 50 % RH, unfilled PA12 typically reaches a moisture content below 0.8 %, while PA6 and PA66 can exceed 2.5 % under the same conditions. In the filled compound, the non-hygroscopic filler fraction lowers total moisture uptake further because water is absorbed primarily by the polyamide phase. This stabilises calibrated mass and attenuation geometry in radiodense housings and counterweights.
Low-temperature impact response is also matrix-dependent. PA12 retains a lower modulus and less brittle response than PA66 at sub-zero temperatures, but the high filler loading in this grade reduces the ductility available from the unfilled polymer. Design evaluations should use notched and unnotched Charpy impact values generated on moulded plaques according to ISO 179-1/1eU and ISO 179-1/1eA at the minimum service temperature of the assembly. Tensile modulus should be measured by ISO 527-1/2. Published data for this specific configuration is limited, so lot-specific test results should replace generic PA12 values in finite-element material cards.
Chemical resistance follows the PA12 matrix. The grade is generally more resistant to zinc chloride stress cracking than PA6, and it withstands many automotive oils and fuels. Compatibility with specific fluids should be evaluated by ISO 175 immersion tests at the operating temperature. The high filler content can create micro-interface gaps that alter chemical ingress compared with unfilled PA12, so immersion testing should be performed on moulded parts, not pellets.
Pre-drying is mandatory before melt processing. The granules should be dried in a closed-loop desiccant dryer with a dew point below -30 °C, typically at 80 °C for 4 h to 6 h, to reach residual moisture below 0.1 % by weight. Moisture content is verified by ISO 15512. Bulk containers stored in ambient conditions above 60 % RH may require extended drying. If moisture exceeds 0.15 % at the feed throat, surface splay and hydrolysis-induced molecular weight reduction are observed on the moulding press.
For initial injection-moulding trials, a rising barrel profile of 220 °C to 240 °C at the rear zone, 230 °C to 250 °C at the middle zones, and 240 °C to 260 °C at the nozzle is a conservative starting point. Melt temperature measured by an immersion thermocouple should remain below 280 °C to limit PA12 degradation. Mould temperature should be held between 40 °C and 80 °C; higher mould temperatures increase crystallinity and may improve dimensional stability but extend cycle time. Back pressure of 0.5 MPa to 1.5 MPa and screw rotation speeds below 100 min⁻¹ reduce filler particle breakdown and gas generation.
Injection speed should be moderate. High-speed filling of thin wall sections can produce jetting and filler orientation gradients. Gates should be sized at least 1.5 times the nominal wall thickness, and hot-runner channels should be polished to avoid stagnant regions where high-density filler can settle during residence time. The melt residence time at injection temperature should not exceed 8 min; longer residence increases the risk of polymer degradation and filler-matrix separation.
The filler content is abrasive. A bimetallic barrel and a hardened screw tip and check ring are required. Non-return valve leakage caused by metal or mineral particle accumulation is a known failure mode on general-purpose screws. On a 120-tonne injection moulding machine, shot-weight variation should be monitored over 500 cycles after initial start-up. If shot weight drifts beyond 0.5 %, the check ring and screw tip should be inspected before continuing.
Drying, melting, and moulding data from unfilled PA12 cannot be transferred to this compound. The high filler loading increases thermal conductivity relative to unfilled PA12, which can reduce the cooling time for thick sections but also increases the risk of freeze-off in cold sprues and small gates. Therefore the mould-filling simulation should use measured thermal diffusivity data from the current datasheet rather than generic PA12 values.
High-density PA12 compounds are used in X-ray diagnostic equipment where mass-attenuation effect must be combined with moulded-in fastening features. The attenuation performance of LATI Latimass 75/4-04 D009 PA12 depends on the filler type, its volume fraction, and the wall thickness. For a given filler system, broad-beam attenuation should be validated with a calibrated Co-60 or Cs-137 source and an ionisation chamber. Narrow-beam geometry is not representative of enclosure joints and lead-equivalent calculations. The medical electrical equipment safety standard IEC 60601-1 requires that radiation-shielding enclosures be verified through the manufacturer’s risk-management file, not by density alone.
Compared with lead sheet, the injection-moulded compound eliminates secondary cutting, bending, and fastening operations and permits reinforced bosses, baffles, and cable channels in one tool. However, the composite has a lower density than lead and higher material thickness is required for the same attenuation. The exact lead equivalence must be measured at the energy range of the X-ray source. Published data for this specific configuration is limited, and the current LATI datasheet does not replace site-specific shielding calculations. Thermal stability under continuous load should be assessed by UL 746B relative thermal index if the enclosure is close to high-voltage tubes or collimators.
A limitation should be stated explicitly: this grade is not a direct replacement for primary shielding in high-energy radiotherapy vaults or for gamma sources above the diagnostic energy range. The polymer matrix and filler particle size distribution may allow local attenuation variation if the part thickness is below 2 mm or if the melt flow creates filler-depleted weld lines.
In under-hood and chassis-mounted sensor brackets, mass-loaded PA12 compounds can shift the natural frequency of a bracket without changing its package size. The dynamic response is evaluated by impact hammer testing with an accelerometer, from which frequency response functions are extracted. The material contribution is not a damping elastomer; the high-density filler increases the mass component and can reduce amplification at resonance when the bracket is tuned. The installed damping factor should be measured on the finished assembly according to ISO 6721-1 or equivalent modal analysis, because geometric stiffening and mounting boundary conditions dominate the installed response.
Compared with die-cast zinc counterweights, the PA12 compound offers net-shape moulding and resistance to salt-spray corrosion. The PA12 matrix also reduces the risk of galvanic corrosion when the weight is mounted to aluminium brackets; long-term performance should be validated by ISO 9227 cyclic salt-spray testing or the applicable automotive OEM specification. The maximum continuous service temperature is bounded by the PA12 matrix; under-hood applications above 120 °C should not be qualified without confirming mechanical strength retention after heat ageing per ISO 178 or ISO 527-2. For applications requiring dimensional stability above 150 °C, a high-density PPS or PEEK-based compound may be more suitable, but those materials have different processing and cost structures.
This grade also differs from glass-fibre-reinforced PA12. Glass fibre increases tensile modulus and strength but causes anisotropic shrinkage and warpage. The high-density filler package in Latimass 75/4-04 D009 PA12 can reduce the shrinkage anisotropy observed in glass-filled grades; shrinkage should be evaluated on a plaque mould according to ISO 294-4 before tooling is finalised. Specific shrinkage values are tool-geometry-dependent and cannot be represented by a single datasheet number.
Incoming inspection should include density and ash content because filler loading affects both mass and attenuation. A digital densimeter based on the Archimedes principle and an analytical balance with 0.1 mg readability are suitable. Lot-to-lot filler content variation of ±1 % can shift part weight and attenuation; the moulder should request a certificate of analysis aligned to ISO 1183-1 for density and ISO 3451-1 for ash. If pellets are supplied from multiple compounding campaigns, dry batch blending before hopper loading reduces density drift.
Secondary operations on filled PA12 require modified parameters. Ultrasonic welding of high-density filled PA12 can degrade the filler at the weld zone if the amplitude is too high; trials should begin with low amplitude and longer weld time. Adhesive bonding requires surface activation by plasma or corona treatment because the filler reduces the surface energy of the moulded part. Mechanical fasteners are the most robust joining method for service loads above the matrix tensile strength. For painting or coating, adhesion tests should follow ISO 2409 cross-cut testing on moulded substrates, not on unfilled PA12 coupons.
Because the grade is formulated for high mass, post-moulding density loss from moisture absorption or matrix degradation should be monitored during qualification. If a moulded part is stored at 80 °C and 80 % RH for 500 h and the density change exceeds the assembly tolerance, the root cause is usually matrix hydrolysis or filler-matrix debonding at the surface. In such cases the drying regime, melt residence time, and mould temperature should be reviewed before field approval.
