LATI Latimass 82-03 D110 is supplied as a granulate compound with a nominal solid density of 11.0 g/cm³ when tested according to ISO 1183-1:2019. The grade consists of a polyamide 12 matrix loaded with a high-density tungsten-based filler dispersion that shifts the unfilled PA12 density from approximately 1.01 g/cm³ to the compact mass and radiation attenuation values required for downstream balancing, shielding, and inertial components. Because the material is a finished molding compound rather than a let-down masterbatch, it is fed directly to injection molding machines or extruded into stock shapes; any dilution with unfilled PA12 alters density, attenuation, and mechanical behaviour linearly for mass fraction but not for photon attenuation. The compound must be dried to residual moisture below 0.10% before melt processing, with verification under ISO 15512:2019 Method B. The melt processing window is bounded at the lower end by incomplete filler wetting below approximately 220°C and at the upper end by the onset of PA12 chain scission above 260°C. Residence time, melt temperature, and manifold temperature are logged because the high-density filler can cause shot-weight drift during interrupted production.

Diagnostic X-ray equipment collimator assemblies and CT gantry shielding inserts are produced from this compound primarily because the high-density filler raises the linear attenuation coefficient per unit thickness while the PA12 matrix offers lower equilibrium water uptake than PA6, which reduces post-molding dimensional movement in beam-limiting devices. The grade is used at 100% by mass in primary collimator blades and tube-housing liners; if a lower-mass secondary shield is specified, the material is let down with unfilled PA12 at ratios not exceeding 15 wt% unfilled resin, but the resulting attenuation thickness is recalculated under narrow-beam geometry per IEC 61331-1:2014. The injection moulding process uses a barrel profile from 200°C at the feed throat to 235°C at the nozzle, a mould temperature of 60–90°C, and a hardened screw and barrel because the tungsten-based filler is abrasive. Shot weight is monitored against density-based conversion because the solid density of 11.0 g/cm³ influences cushion, switchover, and holding-pressure requirements. Terminal parts include CT collimator blades, X-ray tube housing liners, mobile radiography unit curtain frames, dental cone beam CT shielding shells, and ceiling-suspended radiation barriers. Compliance documentation is governed by IEC 60601-1-3:2008/AMD1:2013 for protective shielding in diagnostic X-ray equipment, and material traceability is maintained under ISO 13485:2016 when the moulded component is integrated into a Class II medical device. Skin-contact biocompatibility is not claimed by the compound supplier and is evaluated under ISO 10993-1:2018 only if patient contact exceeds the transient limit defined by the finished device.

What Governs Attenuation Thickness in Nuclear Medicine Syringe Shields Made from Tungsten-Loaded PA12?

For technetium-99m and fluorine-18 handling, syringe shield bodies and vial shields are injection moulded from the compound because the density provides more compact shielding than lead-free polymer composites, and the PA12 matrix tolerates repeated disinfection with quaternary ammonium compounds without the stress-cracking observed in PC/ABS shielding grades. The compound is used at 100% by mass for the shielding body; a 5–10 wt% let-down with unfilled PA12 is restricted to non-shielding handles or label sleeves that remain outside the primary emission path. Moulded wall sections for 99mTc energy are derived from manufacturer attenuation charts based on the interaction of 140 keV gamma emissions with tungsten filler; because published data for this specific filled configuration is limited, attenuation verification is performed with a calibrated ionization chamber and a 99mTc source after first-article moulding. Processing requires a screw recovery speed reduction of approximately 20–30% compared with unfilled PA12 to limit abrasive wear; mould steel hardness above HRC 52 is recommended for long production runs. Terminal product types include radioactive drug-drawing syringe shields, generator elution shields, unit-dose transport pigs, and bench-top isotope vial shields. In the European Union, the assembly is evaluated for radiation protection under Council Directive 2013/59/Euratom; in the United States, nuclear medicine shielding is assessed under NRC 10 CFR Part 20 licence conditions. The polymer compound itself is not certified to ISO 10993 because it is not a patient-contacting surface in conventional shielding use.

On industrial gamma radiography source projectors, exchangeable collimation heads and source guide tube connectors are machined from moulded PA12/tungsten blanks that are produced as near-net shapes by injection moulding, then finish-machined to maintain the angular alignment required for panoramic or directional beam output. In this scenario the compound is not let down with unfilled resin because attenuation performance is governed by source energy—commonly 192Ir, 75Se, or 60Co—and any density reduction moves the shielding thickness outside the envelope allowed by the projector housing. The addition ratio is therefore 100% by mass for attenuation-critical components, with glass-filled PA12 or aluminium used only for non-attenuating structural parts. Production begins with drying at 80°C for 4–6 h to reach 0.08% moisture or below, followed by injection moulding at a melt temperature of 225–245°C and a mould temperature of 70–85°C. The high-density compound cools more rapidly than unfilled PA12 due to increased thermal conductivity, so mould-fill simulation must use measured thermal diffusivity rather than default PA12 database values. Terminal products include collimator exchange rings, source guide tube end fittings, shielded transport plugs, and projector onboard storage cavities. Compliance rests on ISO 3999:2004 for industrial gamma radiography apparatus, and radiation protection verification follows the source containment requirements of ANSI N433.1. For transport, the final projector assembly is qualified under IAEA SSR-6 and 49 CFR 173 Subpart I.

Aerospace Removable Balance Mass and Vibration Damping Inserts

The use of the PA12/tungsten compound in removable balance masses for control surfaces and rotorcraft vibration damping inserts is contingent on verifying the mass per unit volume against the part static balance certification. Moulding shops use the compound at 100% by mass for balance-critical inserts; post-moulding CNC drilling adjusts final mass in increments of 0.1 g where the engineering drawing calls for a static unbalance below 0.05% of the balance mass. The PA12 matrix gives better resistance to repeated mechanical impact during installation than brittle tungsten-loaded thermosets, but the compound is not inherently flame-retardant and is excluded from occupied cabin surfaces unless enclosed in a fire-block cover certified under 14 CFR 25.853(a). Processing is performed on injection moulding machines with clamp force from 60 to 120 tonnes; the high melt density increases screw torque at the recovery stage, so screw speed is set to the lower end of the supplier’s recommended range and back pressure is kept at 0.5–1.0 MPa. Terminal products include aileron counterweight cores, elevator hinge static balance inserts, avionics tray ballast blocks, and helicopter rotor blade tuning masses. The property verification set includes ASTM D792-20 for density, ASTM D638-22 for tensile properties at 23°C, and ASTM D256-23 for notched Izod impact; aerospace material traceability is managed under AS9100D clause 8.5.2, and the compound is not qualified to any aviation fluid immersion specification without end-use testing.

When Underwater Acoustic Payloads Require Non-Magnetic High-Density Ballast

When submerged acoustic arrays and ROV buoyancy correction modules require non-magnetic ballast with minimal long-term water absorption, the PA12-based compound is injection moulded as modular plates and encapsulated around stainless steel threaded inserts. The addition ratio is 100% by mass for ballast plates, but the compound may be machined and assembled with syntactic foam or aluminium frames; no dilution with unfilled PA12 is recommended in seawater because density control is the primary functional requirement. The low water absorption of PA12—below approximately 0.3% at 23°C per ISO 62:2008 for the unfilled matrix—reduces the long-term mass shift in the ballast part compared with PA6. Processing uses barrel temperatures from 205°C to 235°C and a mould temperature of 70°C; insert temperature is maintained above 100°C to prevent premature freezing at the polymer–insert interface, which otherwise produces sink marks or microvoids detectable by pressure-decay leak testing at 0.2 MPa. Terminal products include ROV trim weights, underwater acoustic cable floats, subsea sensor housing ballast rings, and diver-weight cores. Immersion pre-qualification is performed in synthetic seawater per ASTM D1141-98 at 30°C and 60°C; published long-term hydrolysis data for this specific filled compound is limited, so end-use testing is advised before production release.

Precision sporting equipment uses the compound as a lead-free high-density core for archery stabilizers, recurve bow riser weights, and golf club counterweights where dimensional uniformity and resistance to handling sweat are more important than ultimate stiffness. For short-radius balance weights the material is used at 100% by mass; for overmoulded grips or vibration-damped inserts, the high-density core is overmoulded with a soft-touch TPE at a core-to-overmould thickness ratio of 3:1 to keep the centre of gravity within the design envelope. Moulding follows a shortened holding-pressure curve because the high filler content reduces compressibility; a holding time of 8–12 s per 5 mm wall and a cooling time controlled by mould temperature at 50–70°C are typical starting points. Terminal product types include threaded stabilizer weights, bow-mount balance capsules, golf club sole weights, and competition fishing weight inserts. Restricted-substance compliance is demonstrated under EU RoHS Directive 2011/65/EU Annex II as amended by (EU) 2015/863, with batch-level screening for cadmium, lead, mercury, and hexavalent chromium by XRF according to IEC 62321-5:2013. Because tungsten filler is not a RoHS-restricted substance, the material is specified as a lead-free replacement in markets that prohibit lead wheel weights and fishing sinkers under state or regional regulations.

Density Stratification in Hopper Feed Is Avoided by Moulding Stock Shapes for Robotic Counterweights

Robotic end-effector counterweights, machine-tool vibration dampers, and optical table mass blocks are produced from the compound where compact high density and dimensional stability under factory thermal swings reduce the need for periodic recalibration. The compound is used at 100% by mass for mass-block cores, and secondary machining introduces tapped holes or insert threads; if lower density is specified for off-axis balancing, unfilled PA12 is melt-blended at 5–20 wt% by the compounder, not at the injection machine, to avoid stratification of the high-density filler in the granulate hopper. Production-process controls include a moisture analyzer reading below 0.10% before processing, a melt temperature of 225–240°C, a nozzle contact force sufficient to prevent drool, and a screw-with-non-return-valve geometry checked every 500 shots for wear caused by the high-density filler. Terminal products include robotic wrist counterweights, vibration-damped machine tool bases, precision balance masses for optical inspection tables, and pick-and-place arm tuning weights. The mechanical verification set includes ISO 527-1:2019 for tensile modulus, ISO 178:2019 for flexural properties, and ISO 179-1:2010 for Charpy impact; mould shrinkage is validated per ISO 294-4:2018 because the high filler loading reduces linear shrinkage to a narrow band that must be confirmed before finishing operations.