SINOPEC Guangzhou Petrochemical GH-660 HIPS

Product Overview

SINOPEC Guangzhou Petrochemical HIPS GH-660 is a high-impact polystyrene (HIPS) injection molding grade resin manufactured by SINOPEC Guangzhou Petrochemical Co., Ltd. It belongs to the impact-modified grade within the SINOPEC® PS product line. Appearing as milky white opaque pellets, this material incorporates a butadiene rubber phase into the continuous polystyrene matrix, thereby overcoming the brittleness of homopolymer GPPS while balancing structural rigidity, colorability, and moderate melt flowability.

In the plastics processing industry, GH-660 is recognized as a staple benchmark HIPS grade with large global trade volumes and extensive downstream verification. Backed by SINOPEC’s large-scale production capacity and consistent quality control, this grade boasts a proven track record of successful exports across Asia-Pacific, the Middle East, South America, and Europe, making it a reliable raw material choice for overseas home appliance manufacturers, toy brands, and packaging enterprises. Its market positioning is distinct: rather than targeting high-heat engineering applications or transparent optical parts, GH-660 is designed for cost-sensitive injection molding scenarios requiring good surface appearance and daily drop impact resistance—such as appliance housings, small appliance covers, toy bodies, stationery casings, general housewares, and low-voltage electrical internal structures. For overseas B2B buyers, its key value lies in stable factory supply, controlled batch cleanliness, a versatile MFR processing window, and good compatibility with GPPS regrind and color masterbatches, making it ideal for high-volume inventory procurement.

Technical Data Sheet (TDS)

Physical Properties

Mechanical Properties

Disclaimer: The technical data sheet (TDS) of GH-660 HIPS material from SINOPEC Guangzhou Petrochemical corporation, if there are differences, please refer to the official website of SINOPEC Guangzhou Petrochemical.

Features & Benefits

• High Impact Resistance & Reduced Brittleness: Rubber phase toughening achieves a notched impact strength of ≥71 J/m, preventing stress whitening or cracking under everyday mechanical stresses such as snap-fit assembly, drops, and transportation vibrations, outperforming standard GPPS.

• Moderate Flowability & Stable Mold Filling: An MFR of 5.5–7.5 g/10min suits standard injection parts with wall thicknesses of 1.5–3.0 mm, minimizing short-shot risks in multi-cavity molds and ensuring controllable cycle times.

• Balanced Rigidity & Dimensional Stability: Featuring a tensile strength of ≥17 MPa and elongation at break of ≥30%, molded parts retain ductility under mechanical loads, avoiding instantaneous brittle failure under assembly stress.

• Easy Colorability & Excellent Surface Finishing: HIPS inherently offers easy pigment dispersion for custom color matching (black, white, gray, or custom shades), making it suitable for appliance housings, toys, and stationery requiring high color consistency.

• Electrical Insulation & Weak Chemical Resistance: Retains polystyrene’s inherent electrical insulation and short-term resistance to water, weak alkalis, and alcohols, making it suitable for low-voltage internal components and daily consumer products.

• Low Processing Threshold & Controlled Recyclability: Low moisture absorption eliminates the mandatory pre-drying step under intact original packaging; clean sprues and runners can be blended with virgin resin at a 3:1 or 4:1 ratio, keeping marginal production costs controlled.

Applications

• Home Appliance & Electronic Housings: Television back covers, set-top box enclosures, small appliance covers, electric fan shrouds, switch socket panels, router casings, and internal frames for low-voltage electronics—driven by high impact strength, easy color matching, and cost efficiency.

• Toys & Children’s Products (Non-Food Contact): Building block shells, remote-controlled car bodies, educational toy parts, pencil cases, and student supplies—resisting breakage upon drops, with an MFR window well-suited for intricate thin-ribbed structures.

• Daily Consumer Goods & Housewares: Clothes hangers, storage boxes, mounting brackets, pump caps for personal care bottles, trash bin housings, and non-heated kitchenware components.

• Mechanical Parts & Industrial Hardware: Non-load-bearing snap fasteners, guide blocks, equipment face shields, instrument frames, and non-metallic small components on automated production lines.

• Automotive Interior Non-Heated Parts: Glove box inner liners, interior trim covers, and air vent dial bezels (excluding engine compartments and prolonged high-heat zones).

Operational Boundaries: GH-660 is a non-flame-retardant, non-weatherable, and non-high-heat grade. Prolonged outdoor UV exposure causes yellowing and embrittlement (UV-resistant HIPS or ASA is recommended instead); applications subject to direct heat sources, requiring V-0 flame retardancy, boiling water sterilization, or direct food contact are not suitable out of the box—food contact compliance requires factory food-grade declarations plus finished-product migration testing, while high-flame-retardant enclosures require flame-retardant HIPS or flame-retardant ABS.

Frequently Asked Questions (FAQs)

Q1: Is drying required before processing GH-660?

A1: HIPS exhibits low hygroscopicity; under intact packaging and dry warehouse storage, forced drying is generally unnecessary. However, if packaging is damaged, bags are left open during high-humidity seasons, or silver streaks/bubbles appear on molded parts, hot-air drying at 70–80°C for 1–2 hours is recommended to achieve a target moisture content of <0.1%. Material should be transferred in sealed hoppers post-drying to prevent re-absorption. Mold temperatures between 40–60°C are recommended, as higher mold temperatures help minimize internal stress and enhance surface gloss.

Q2: How should I choose between GH-660 (HIPS), GPPS, and ABS?

A2:

• vs GPPS: As a high-impact polystyrene, GH-660 offers significantly higher impact toughness than homopolymer GPPS and appears as an opaque milky white resin, making it ideal for drop-resistant enclosures; in contrast, GPPS is crystal clear, rigid, and brittle, making it suitable for transparent displays and non-load-bearing parts.

• vs ABS: ABS provides superior tensile strength, heat resistance, and chemical resistance, but comes with higher material costs, mandatory drying, and slightly higher mold shrinkage; GH-660 offers a lower cost profile, easy colorability, and simpler processing, fitting appliance and toy housings without strict heat or harsh chemical requirements.

• Selection Guidelines: Cost-sensitive + high gloss + moderate impact resistance → GH-660; High transparency → GPPS; High rigidity / heat resistance / oil resistance → ABS.

Q3: How do I verify RoHS, REACH, UL, and food contact compliance for GH-660?

A3: Each delivery from ZiJun Plastics includes a TDS and SDS (MSDS), with COAs issued per batch; RoHS and REACH SVHC compliance declarations can be provided with shipments based on third-party batch testing. For UL 94 yellow card verification, ensure the specific grade name, color, and wall thickness match your actual order details rather than assuming default approval. Food contact compliance (FDA / EU 10/2011 / GB 4806) is not implied by default—industrial-grade GH-660 requires an original manufacturer food-grade statement, food-grade certified white oils/color masterbatches across the formulation, and third-party migration testing on the finished article prior to use in tableware, cups, or food containers.