The Cixi Guozhiguang PC/ABS 50G10FR is a polycarbonate/acrylonitrile-butadiene-styrene alloy compounded with a glass-fibre reinforcement and a flame-retardant package. The grade designation is read according to supplier convention as a 10 wt% glass-fibre-filled flame-retardant PC/ABS compound. Published multi-lot data for this specific configuration is limited; therefore, the numerical envelope presented below is derived from representative 10 wt% glass-fibre-filled flame-retardant PC/ABS compounds and must be verified against the supplier lot certificate. The compound is supplied in pellet form for injection moulding of electrical, electronic, and structural housing components requiring a vertical-burn rating and improved modulus compared with unfilled PC/ABS. Because the supplier identifies the compound as a PC/ABS system rather than a polycarbonate or ABS homopolymer, the morphology consists of a polycarbonate-rich continuous phase with grafted ABS domains. The glass fibre at 10 wt% places the grade between unfilled FR PC/ABS and higher-stiffness 20 wt% glass-filled variants. Flame-retardant chemistry can be brominated, phosphorus-based, or a halogen-free intumescent package; the specific package for this lot is not revealed by the designation 50G10FR and must be obtained from the supplier, particularly for halogen-content declarations.

What Processing Conditions Prevent Moisture-Related Surface Defects in 50G10FR?

Predrying is mandatory. The resin should be dried in a desiccant dryer at 80 °C to 100 °C for 3 h to 4 h, achieving a residual moisture content below 0.02 wt%. Dew point of the drying air should be −40 °C or lower. Melt temperature should be held between 250 °C and 270 °C; barrel residence time above 5 min at the upper limit is associated with polymer degradation, splay, and flame-retardant bloom. Mold temperature should be 70 °C to 90 °C to obtain adequate surface finish and reduce glass-fibre protrusion. Injection velocity is set medium to high, with hydraulic pressure from 70 MPa to 140 MPa and back pressure 0.3 MPa to 0.6 MPa. On reciprocating-screw machines, a shut-off nozzle is recommended above 250 °C to prevent drool and residence-time variability. Hot runners should use open-pipe channels of 3.0 mm minimum diameter without dead spots; valve-gate systems require cycle time below 30 s to limit hold-up.

Desiccant dryer settings should be verified with a dew-point meter at the hopper inlet. Dryer capacity should not exceed the feed rate by more than 25% to avoid dead zones where pellets remain hot for extended periods. A vacuum dryer at 100 °C for 2 h is an alternative when hopper residence time is short. Compounding and injection moulding machines should employ wear-resistant barrels and screws because glass fibre increases abrasion; surface-hardened screws with a length-to-diameter ratio of 20:1 to 22:1 and a compression ratio of 2.0:1 to 2.5:1 are typical for glass-filled PC/ABS. Melt-cushion control is critical because the material has limited compressibility; a cushion of 3 mm to 6 mm reduces shot-weight variation.

Mould vent depth should be 0.02 mm to 0.04 mm to allow gas escape without flash. Lands should be 0.05 mm to 0.08 mm deep. Gate diameter or thickness should be at least 60–70% of the nominal wall, with a minimum of 1.5 mm for parts above 2.0 mm wall. Glass-fibre orientation near the gate creates frozen-in stress and warpage; gate placement on the long axis and away from sudden thickness changes is preferred. Shrinkage in the flow direction is lower, typically 0.2% to 0.4%, while transverse shrinkage may reach 0.5% to 0.6%; tooling should use differential shrink factors rather than an isotropic value.

Tensile property measurements according to ISO 527-2 on conditioned specimens typically place tensile stress at break between 55 MPa and 65 MPa, with tensile modulus between 3500 MPa and 4500 MPa. Flexural modulus is reported under ISO 178 in the range 4000 MPa to 5000 MPa. Notched Izod impact at 23 °C under ISO 180/1A ranges from 8 kJ/m² to 14 kJ/m²; at −30 °C the value falls to 5 kJ/m² to 7 kJ/m². Heat deflection temperature under ISO 75-2/Af at 1.82 MPa is expected between 105 °C and 120 °C. Density under ISO 1183-1 is between 1.30 g/cm³ and 1.35 g/cm³. Melt volume-flow rate under ISO 1133-1 at 260 °C/5 kg is in the range 12 cm³/10 min to 20 cm³/10 min. These ranges reflect the 10 wt% glass-fibre class; actual lot data may differ.

Conditioning of specimens at 23 °C and 50% RH for 72 h is required for comparative Izod data, because moisture absorption of the polycarbonate phase increases impact but reduces modulus. The glass fibres produce anisotropic tensile properties; values measured on edge-gated plaques may be 10–20% lower in the transverse direction than in the flow direction. Unnotched Charpy impact under ISO 179-1/1eU is typically 30–50 kJ/m² for this filled class, but this value is highly dependent on fibre-length retention after plastication. Injection moulding with a high back pressure above 0.8 MPa can break glass fibres and reduce tensile modulus by 15% or more; glass-fibre content should be verified on as-moulded parts by muffle furnace ignition according to ISO 3451-1 if property consistency is required.

Flame-Retardant Performance Is Governed by Section Thickness and Glass Distribution

UL 94 vertical-burn testing according to IEC 60695-11-10 is normally satisfied at 1.6 mm and 3.0 mm for this product class, with a V-0 classification. The flame-retardant mechanism in PC/ABS is primarily char formation; the polycarbonate phase dehydrates to a carbonaceous shield, while the FR package reduces afterflame and afterglow. Glass fibres alter the burn path by concentrating heat at the fibre-resin interface and wicking fuel to the flame front. At 10 wt% glass, the dilution effect is moderate, but sections below 1.2 mm may show inconsistent vertical-burn performance because the char layer is too thin to bridge the glass-fibre domains. For thin-wall connectors, a minimum nominal wall of 1.5 mm is recommended unless verified on the actual tool. Glow-wire requirements for unattended appliance components may require separate end-product evaluation; published data for this specific configuration is limited.

The reduction in UL 94 performance with increasing glass content is documented in the polymer literature; glass fibres act as thermal conductors and create capillary paths through the char. For a 10 wt% glass-filled system, the vertical-burn rating is usually maintained at 1.6 mm, but the tolerance for regrind and pigment levels is narrower than for unfilled compounds. The use of colour concentrates containing titanium dioxide above 2 wt% can increase afterflame time and should be validated on the final tool. Afterglow may be suppressed more effectively by phosphorus-based FR grades than by brominated systems in polycarbonate-rich matrices, but the specific package must be known before additive selection.

The difference between the 10 wt% glass-filled alloy and an unfilled FR PC/ABS is essentially a trade-off in stiffness versus toughness. The tabulated tensile modulus rises from 2200–2600 MPa to 3500–4500 MPa, while notched Izod impact falls from 20–40 kJ/m² to 8–14 kJ/m². Compared with a 20 wt% glass-filled FR PC/ABS, the 10 wt% variant retains lower melt viscosity and better surface appearance on complex tools, while the 20 wt% product provides higher modulus and HDT but produces greater anisotropic shrinkage and warpage. The 10 wt% grade is therefore positioned for parts requiring a moderate stiffness increase over unfilled FR PC/ABS without the mould-filling and flatness issues of higher-fibre compounds.

When the Grade Is Specified for Electrical Enclosures Instead of Unfilled FR PC/ABS

Potential application areas include electrical enclosures, power adapters, switch components, and structural brackets where a vertical-burn rating under IEC 60695-11-10 is mandatory and where unfilled FR PC/ABS exhibits insufficient flexural modulus. For such applications, the design should account for a tensile modulus of approximately 3500–4500 MPa and a coefficient of linear thermal expansion in the flow direction typically 0.3 × 10⁻⁴/K to 0.5 × 10⁻⁴/K; the transverse coefficient may be higher due to glass orientation. The material is not recommended for components requiring high snap-fit deflection because the glass fibre lowers elongation at break to below 3–5%. Electrical insulation strength and comparative tracking index must be measured on the finished part, because filled systems and mould stain can alter surface resistivity and tracking resistance. Dimensional stability in damp heat should be evaluated under IEC 60068-2-78 at 85 °C/85% RH for 168 h if the component is used in outdoor or humid service.

Electrical enclosures and battery-management housings often require comparative tracking index performance above 250 V under IEC 60112; this should be verified because glass fibres reduce CTI compared with unfilled polycarbonate-rich grades. The material shows surface resistivity above 10¹² Ω only when dry; at 85 °C/85% RH, moisture uptake can lower surface resistance by one to two decades. For water- and dust-tight enclosures, the flange should be designed with a minimum sealing pressure of 0.5 N/mm² to avoid leakage caused by long-term creep. Heat ageing at 100 °C for 1000 h may reduce tensile strength by 8–12%; if service life requirements exceed this, a UL 746B relative thermal index verification is necessary.

Regulatory Status and Characterisation Data Requirements

Supplier documentation should confirm compliance with the waste electrical and electronic equipment directive 2011/65/EU Annex II substance restrictions and with the REACH Regulation (EC) 1907/2006 SVHC Candidate List at the date of supply. For exported assemblies, the grade should be assessed for halogen content if a brominated or chlorine-free declaration is required; the exact FR chemistry must be obtained from the supplier because the 50G10FR designation alone does not state whether the package is brominated, phosphorus-based, or a synergistic blend. For global supply, the manufacturer should provide a full material declaration in IPC-1752 or equivalent format. Halogen content per IEC 61249-2-21 is not automatically met by the product class; brominated and chlorine-free claims require analytical confirmation by oxygen bomb combustion followed by ion chromatography. If the material is used in medical device housings, ISO 10993-5 cytotoxicity and ISO 10993-10 irritation data are not provided by default and must be generated by the end user.

Operational boundary conditions for this compound class include a maximum hot-melt temperature of 270 °C; prolonged operation above this threshold accelerates polycarbonate hydrolysis and flame-retardant volatilisation. The compound should not be purged with rigid PVC or acetal, and contact with amine-containing mould release agents should be avoided because alkaline residues can catalyse polycarbonate chain scission. Regrind ratios are typically limited to 20 wt% for flame-retardant property retention; multiple regrind heat histories reduce impact and may alter UL 94 performance. The material is not suitable for direct food-contact use unless a specific migration study under EU Regulation 10/2011 is completed, and it is not recommended for continuous service above 80 °C without a UL 746B relative thermal index assessment. Actual lot data should be obtained before tool start-up.