Dongguan Qiantai PC/ABS HT-C01-FR is a flame-retardant polycarbonate/acrylonitrile-butadiene-styrene alloy supplied in pellet form for injection moulding of electrical and electronic enclosures. The product designation HT-C01-FR is the manufacturer’s code; the FR suffix is associated with a UL 94 vertical burn classification of V-0 at 1.5 mm on supplier certification documents, while the HT prefix is a supplier sub-range identifier rather than a defined heat-deflection class. Published multi-lot property data for this exact designation are limited. The numerical values in this document are representative of flame-retardant PC/ABS grades having equivalent density and melt-flow coordinates, and must be replaced by the supplier certificate of analysis for final part approval.

Typical usage includes charging station housings, power distribution enclosures, router and server faceplates, appliance control panels, and battery-management-system covers. These applications impose fire enclosure requirements under IEC 62368-1, IEC 61010-1, or IEC 61851-1. Wall stock is commonly 2.5 mm to 3.0 mm; the 1.5 mm UL 94 V-0 rating provides margin for local thinning at ribs and snap features, but flame performance at the minimum production wall thickness must be revalidated.

The base polymer system is a melt-compounded polycarbonate/acrylonitrile-butadiene-styrene alloy. The supplier does not publicly disclose the flame-retardant chemistry. If halogen-free status is required, the lot-specific IEC 61249-2-21 halogen content and smoke-density data should be requested. The material is not intended for direct food contact or implantable medical devices; compliance with FDA 21 CFR 177.1580 or USP Class VI is not implied unless stated in a supplier regulatory letter.

How Does HT-C01-FR Differ from General-Purpose PC/ABS and High-Flow FR ABS?

In comparison with general-purpose PC/ABS without flame-retardant additives, the FR package in HT-C01-FR reduces ductility and low-temperature impact while raising density and melt flow under the same shear load. In comparison with high-flow FR ABS, the PC/ABS alloy provides higher stiffness and heat-deflection resistance but has a higher melt viscosity and requires more aggressive drying. The comparative matrix below is representative; it should be read as a formulation-class comparison, not a lot-specific specification.

Flame-retardant additives also shift the decomposition onset. Differential scanning calorimetry of comparable blends typically shows the glass transition of the PC phase near 145°C and of the SAN/ABS phase between 100°C and 115°C. The flame-retardant species can plasticize the matrix by 5°C to 10°C, lowering Vicat softening temperature relative to an FR-free PC/ABS of similar PC content. These thermal transitions are not application ratings but support annealing of moulded parts at 90°C.

Specimens moulded according to ISO 294-1 at a melt temperature of 260°C and a mould temperature of 80°C yield tensile stress at yield of 55 MPa and flexural modulus of 2400 MPa under ISO 527-2:2012 and ISO 178:2019. Charpy notched impact at 23°C is 30 kJ/m² when tested according to ISO 179-1:2010; at -30°C the value falls to 8 kJ/m², which is characteristic of PC/ABS blends with ABS-rich impact modifiers. The notched impact difference between 23°C and -30°C is a critical design input for outdoor enclosures in cold climates, especially for snap-fit covers and bosses subjected to installation impact.

HDT/A at 1.8 MPa is 96°C under ISO 75-2:2013. Vicat softening temperature VST/B50 is 112°C under ISO 306:2022. These thermal values place the grade in the moderate heat range. For enclosures exposed to continuous wall temperatures above 85°C, additional creep modulus data at 80°C and 90°C should be used for rib design. Glass-fibre-reinforced PC/ABS or FR PC grades are more suitable when HDT/A above 110°C is required.

Capillary rheometry at 260°C using a 1 mm die in a piston-driven capillary rheometer yields apparent viscosity of 120 Pa·s to 180 Pa·s at 1000 s⁻¹. At 10,000 s⁻¹ the apparent viscosity decreases to 30 Pa·s to 50 Pa·s, indicating pronounced shear thinning. The power-law index in the processing shear-rate region is below 0.4. Gate shear rates above 100,000 s⁻¹ are not recommended because shear heating can degrade the flame-retardant package and generate black specks.

Mould shrinkage for a 3 mm plaque is typically 0.5% to 0.7% in the flow direction and 0.6% to 0.8% transverse under ISO 294-4. Shrinkage anisotropy should be measured on a cavity-pressure-controlled machine for gears, snap fits, and optical alignment features. Post-mould shrinkage at 85°C for 2 h can add 0.1% to 0.2%, which matters for bosses with pressed-in metal inserts.

Chemical resistance is typical of PC/ABS. Aromatic hydrocarbons, ketones, esters, and strongly alkaline cleaners can induce environmental stress cracking under moulded-in stress. Solvent compatibility should be evaluated per ISO 22088-2 or ASTM D543. Outdoor use without UV stabilization results in surface chalking and loss of gloss; weathering programs such as ISO 4892-2 should specify cycle time, irradiance, and acceptance criteria if the part is exposed to direct sunlight.

Thermal, Electrical and Fire-Performance Data for Moulded Enclosures

Electrical and fire data for the material class are anchored to test methods rather than to unverified application claims. The UL 94 vertical burn rating is V-0 at 1.5 mm, with no drips or afterflame beyond the specified limits. Glow-wire testing on comparable FR PC/ABS tends to produce a glow-wire flammability index of 960°C at 2.0 mm under IEC 60695-2-12; the exact GWFI for HT-C01-FR must be read from the supplier’s glow-wire certificate because FR chemistry and filler content influence the glow-wire result. Glow-wire ignition temperature on the same class is typically 850°C at 2.0 mm under IEC 60695-2-13.

The comparative tracking index is relevant for creepage distance calculations under IEC 60664-1. A CTI of 175 V places the grade in material group IIIa. Designers may reduce creepage distances if the supplier certifies a higher CTI, but published data for this specific configuration is limited. Surface resistivity and volume resistivity for flame-retardant PC/ABS are typically 1E+14 Ω and 1E+15 Ω·m under IEC 62631-3-1; however, these values degrade after exposure to dust, condensation, and mould-release residues.

Material substitution from sheet metal or straight PC/FR requires re-evaluation of wall stock, boss design, and mounting loads. For a ribbed enclosure wall of 2.5 mm, the flexural modulus of 2400 MPa supports lower snap-fit deflection than a 3.0 mm straight PC/FR wall at 2600 MPa. When replacing metal, thermal expansion coefficient of 70 µm/(m·K) to 80 µm/(m·K) in the flow direction should be accounted for in clearances around metal inserts.

Before processing, pellets are dried in a desiccant-bed dryer with inlet air at 80°C to 100°C and dew point below -30°C for 3 h to 4 h. Maximum moisture content at the machine throat is 0.04%. If ambient relative humidity exceeds 60%, dry-air hopper loading and sealed material lines are used because re-moisturisation of dried pellets occurs within 30 min to 60 min in unprotected hoppers. PC hydrolysis above 260°C produces surface splay, delamination at weld lines, and a drop in Charpy impact. On twin-screw compounding lines, moisture control is typically maintained below 0.03% for pelletising; injection moulders should apply the same discipline.

Barrel zone settings from feed throat to nozzle are typically 240°C, 250°C, 260°C, 260°C, and 255°C at the nozzle. Melt temperature should be measured by an air-shot pyrometer probe and kept between 250°C and 270°C. Mould temperature is 60°C to 90°C; lower mould temperatures reduce cycle time but increase frozen-in stress and lower gloss consistency. Back pressure is set at 3 MPa to 7 MPa for colour dispersion and melt homogeneity. Screw speed is limited to 40 rpm to 80 rpm for a 35 mm to 45 mm general-purpose screw; excessive screw speed reduces flame-retardant effectiveness through high-shear heat. Injection pressure is typically 80 MPa to 120 MPa, with hold pressure 60% to 80% of peak injection pressure. Cushion is maintained at 2 mm to 5 mm.

Observed failure modes on production machines include silver streaking from wet pellets, jetting from undersized gates, and black specks from dead spots in hot runner manifolds. Black specks are often misdiagnosed as contamination; under hot runner conditions, they are generated by local residence times exceeding 10 min in poorly purged manifold corners.

When Hot Runner Tools and Thin-Wall Sections Expose Residence-Time Limits

The flame-retardant package narrows the processing window compared with unfilled PC/ABS. If a thin-wall section of 1.0 mm to 1.2 mm requires nozzle temperatures near 270°C to fill, the permissible melt residence time shortens to 6 min. In hot runner systems with internally heated manifolds, polymer in unheated dead zones can remain for 15 min to 30 min; this generates acidic degradation products, black specks, and plate-out on cavity surfaces. Valve-gated hot runners are preferred over open hot tips because they reduce melt drool and stagnant volumes at the gate. Manifold channels should have no blind holes, and melt passages should be streamlined with a recommended shear rate below 100,000 s⁻¹ for PC/ABS.

Plate-out on vent depths below 0.02 mm becomes significant after 20,000 to 30,000 shots; production tools should include polished vents and a scheduled cleaning interval. When the material is purged, a commercial styrenic or polypropylene purging compound is used at the same barrel settings, followed by a viscosity-matched transition purge. Polysulfone, PVC, acetal, and polyamide residues are incompatible; shutdown should not leave the material in the barrel above 200°C for more than 30 min.

For two-shot moulding with thermoplastic elastomer seals, the PC/ABS substrate should be pre-dried and processed at the lower melt temperature of 250°C to reduce outgassing at the interface. Mould surface temperature of 80°C improves adhesion of TPU/TPE overmould. When the FR grade is processed near upper temperature limits, bond-line adhesion may be reduced by decomposition by-products; published data for this specific configuration is limited. Amine-based heat stabilisers and certain hindered amine light stabilisers should be avoided unless supplier approval is obtained, as they can accelerate PC hydrolysis and yellowing.