Ningbo Leevan HIPS HP 825

Product Overview

Basic Information

1. Manufacturer: Ningbo Leevan New Material (Ningbo Leevan), a professional domestic manufacturer of modified polystyrene raw materials. The company focuses on the R&D, production, and bulk export of general-purpose plastics, modified HIPS, and GPPS resins, with products tailored to meet the needs of injection molding and extrusion processors worldwide.

2. Material Classification: HIPS (High Impact Polystyrene), a general-purpose modified polystyrene base resin.

3. Physical Appearance: Standard cylindrical plastic pellets; natural milky white opaque granules. Free of black spots, scorched particles, and dust; exhibits uniform flowability, ensuring no screen pack clogging or exudation during processing.

Industry Positioning & Application Summary

Ningbo Leevan HIPS HP 825 is a flagship general-purpose high impact polystyrene grade that balances melt flowability, ambient impact strength, and rigidity. It serves as a highly cost-effective, go-to HIPS raw material for the home appliance, daily consumer goods, and toy industries.

This grade combines easy processability with foundational mechanical strength, making it ideal for conventional injection molding processes. It satisfies the production demands of most non-load-bearing housings, liners, and decorative parts without requiring complex modifications. Widely supplied to domestic manufacturing plants and export-oriented injection molders in Southeast Asia and the Middle East, it offers three core industry advantages: stable spot availability, minimal batch-to-batch performance fluctuation, and controllable costs. Its primary coverage spans molded components across daily sundries, small appliance housings, children’s toys, packaging liners, office supplies, and many other fields.

Technical Data Sheet – TDS

Physical Properties

Mechanical Properties

Thermal Properties

This is the technical data sheet (TDS) of Ningbo Leevan HIPS HP 825 material from Ningbo Leevan corporation. In case of any discrepancies, please refer to the official website of Ningbo Leevan.

Features & Benefits

• Balanced Flow Performance: With a melt flow rate (MFR) of 4.6 g/10min, it flows smoothly within conventional injection molding temperature ranges. It ensures complete filling for thin-walled parts and complex textures, preventing short shots and shrinkage defects, resulting in high production efficiency suitable for high-speed automated injection molding.

• Excellent Ambient Impact Resistance: Its unnotched Izod impact strength reaches 10 kJ/m², meaning finished products resist cracking or brittle fracturing during daily bumps and drops. Compared to standard GPPS, it significantly enhances product durability and lowers scrap rates of finished goods.

• Stable Balance of Rigidity and Toughness: Featuring a flexural modulus of 1950 MPa, housings and structural brackets maintain excellent dimensional stability without warping after molding. This ensures uniform tolerances across high-volume production runs, eliminating the need for secondary corrections.

• Steady Heat Deflection Behavior: With a Vicat softening point of 92.5°C, it resists heat softening or deformation under conventional household and ambient operating conditions, accommodating the long-term use requirements of small appliances and daily commodities.

• Pure and Impurity-Free Base: The natural color pellets exhibit strong masterbatch compatibility, allowing direct blending with various colorants. It delivers uniform coloring without pigment floating, yielding a delicate surface gloss on finished products that eliminates the need for secondary painting, thereby lowering post-processing costs.

• Compliant Eco-Friendly Material: The foundational formulation contains no hazardous heavy metals and satisfies standard RoHS environmental testing requirements, making it suitable for manufacturing export toys and consumer sundries.

Typical Applications

Household Appliance Industry

Internal and external housings for small home appliances, including humidifiers, electric fans, hair dryers, and robotic vacuum cleaner liners; water dispenser decorative panels, refrigerator crisper drawer liners, and indoor air conditioner unit plastic trims. HP 825 perfectly matches these production requirements where drop resistance, dimensional stability, and uniform surface aesthetics are critical.

Children’s Toys & Gifts

Building blocks, assembly models, plastic figurines, desktop educational toys, and plastic components for festive gifts. The material’s good toughness ensures toys do not shatter easily during rough handling, while its eco-friendly formula complies with foundational safety standards for toy products and provides excellent coloration.

Consumer Goods & Office Supplies

Storage boxes, plastic clothes hangers, cosmetic packaging bases, pen holders, document organizers, mirror backplates, disposable tableware liners, and toiletry plastic cases. It is the preferred resin for high-volume consumer goods injection molding due to its low processing waste and distinct cost advantages.

Packaging Industry

Protective plastic liners replacing EPS foam for home appliances, logistics cushioning inserts, simple protective covers for instruments, and food packaging containers used at room temperature. The molded parts are lightweight and offer superior cushioning properties compared to general-purpose GPPS, improving protection during product transit.

General Industrial Trims

Housings for compact instruments and meters, simple decorative covers for charging piles, lighting fixture plastic bases, and plastic fittings for advertising displays. It provides sufficient rigidity to resist warping, making it ideal for injection molding various types of aesthetic trim components.

Frequently Asked Questions (FAQs)

Q1: Does Ningbo Leevan HIPS HP 825 require pre-drying before injection molding? What are the recommended drying parameters?

A: As a polystyrene material, HP 825 has extremely low ambient moisture absorption. Under conventional warehouse conditions, forced drying is not mandatory for short-term use. However, if the resin has been stored in a high-humidity warehouse, or if you are manufacturing high-gloss aesthetic components, the recommended drying conditions are 60–70°C for 2–4 hours. This completely eliminates surface defects such as silver streaks and bubbles.

Q2: How should I choose between HIPS HP 825, GPPS, and ABS materials?

A:

1. Compared to GPPS: HP 825 offers much higher impact strength than standard general-purpose polystyrene, making it suitable for products that must be shatterproof and drop-resistant; GPPS is only suited for simple, transparent items without impact requirements.

2. Compared to ABS: ABS provides greater toughness, temperature resistance, and chemical resistance, but its raw material cost is higher. HP 825 offers outstanding cost-efficiency, making it ideal for civil-grade products used at room temperature without exposure to oil corrosion or high-load stresses. For budget-conscious daily commodity projects, HP 825 is the priority choice.

Q3: Does this grade comply with RoHS environmental export standards? Can it be used for exporting children’s toys?

A: The base resin formulation of Ningbo Leevan HIPS HP 825 contains no restricted substances such as lead, mercury, or polybrominated biphenyls (PBBs). The manufacturer can provide batch-specific RoHS test reports that conform to fundamental EU environmental regulations. For children’s toys exported to Europe and North America, third-party testing certificates can be provided to meet conventional toy safety standards. For specific food-contact applications, please consult the manufacturer to customize food-grade modified grades.

Q4: Can HP 825 be re-granulated for recycling? How much do its properties degrade?

A: This virgin HIPS resin can be recycled and re-granulated 1 to 2 times for blended use, with a recommended virgin material ratio of no less than 60%. After multiple recycling cycles, its unnotched Izod impact strength drops significantly. Therefore, pure regrind is not recommended for producing high-end toys or aesthetic housings; it should only be used for internal, non-appearance structural supports.