ポリスチレン(PS)

Polystyrene (PS), including crystal-clear GPPS and tough HIPS, is a widely used commodity plastic offering high dimensional stability, low shrinkage, and excellent optical clarity or impact resistance. Jucheng Precision, an ISO 9001 and ISO 13485 certified manufacturer, provides custom PS injection molding tailored to strict optical and medical tolerances. Equipped with 35+ advanced molding presses (50-650T) and 25+ in-house 5-axis CNC machines, we control PS’s brittleness through precise gate designs and ejector systems. Our engineers deliver free DFM analysis within 24 hours to optimize parting lines and minimize weld marks, verified by Zeiss CMM inspection.

Precision-injection-molded-clear-GPPS-petri-dishes-and-matte-grey-HIPS-electronic-housings-1

利用可能な材料

PS-奇美 PH-88S

PS-奇美 PH-88S(POLYREX® PH-88S)は、奇美実業が製造する高級押出グレードの高衝撃ポリスチレン(HIPS)で、シート押出、熱成形、および高靭性容器の特殊成形に最適化されています。メルトフローレートが2.6 g/10分と低く、曲げ弾性率が1,400 MPaであるこのグレードは、耐環境応力亀裂性(ESCR)冷蔵庫ライナーや使い捨て食品包装の業界標準です。Jucheng Precisionは、ISO 9001およびIATF 16949品質フレームワークの下で、PH-88Sの成形を専門とし、均一な肉厚を確保しています。社内の25台以上の5軸CNC機械を活用し、その溶融配向と0.4%-0.7%の収縮に対応する堅牢でバランスの取れた金型を設計しています。.

続きを読む

PS-Chi Mei POLYREX PG-33

PS-Chi Mei POLYREX PG-33 is a general-purpose polystyrene (GPPS) grade manufactured by Chi Mei Corporation, revered for its high optical brightness, standard melt flow (MFI 8.0 g/10 min), and lightweight density of 1.04 g/cm³. Specially formulated for standard injection molding, this grade is the global standard for high-refraction lampshades, transparent food containers, and CD jewel cases. At Jucheng Precision, an ISO 9001 and IATF 16949 certified contract manufacturer, we utilize our 25+ in-house 5-axis CNC machines to cut mirror-polished S136 stainless steel molds. This prevents weld-line defects and relieves residual molding stresses, delivering pristine, stress-free optical components verified by Zeiss CMM inspection.

続きを読む

PS-Sabic HIPS 638

PS-Sabic HIPS 638は、SABICが製造する高衝撃ポリスチレン(HIPS)グレードであり、卓越した構造靭性、優れた剛性、および制御されたメルトフロー(MFI 8.0 g/10 min)で高く評価されています。剛性のポリスチレンマトリックス内に分散したゴム変性ポリブタジエンドメインで重合されたこの不透明樹脂は、重荷重用家電部品、構造玩具、電子機器筐体の世界標準です。ISO 9001およびIATF 16949認証を取得したメーカーであるJucheng Precisionでは、表面欠陥なしでHIPS 638を成形することを専門としています。25台以上の社内5軸CNCツーリングを活用し、ゲートサイズとパッカープロファイルを最適化して、重い構造リブのヒケを防ぎ、Zeiss CMM検査で検証された完璧な部品を提供します。.

続きを読む

PS-Trinseo STYRON 678D

PS-Trinseo STYRON 678Dは、Trinseo社が設計した光学グレードの汎用ポリスチレン(GPPS)であり、その卓越したガラス並みの透明性、高い耐熱性、バランスの取れた溶融成形性で高く評価されています。密度1.04 g/cm³、安定したメルトフローレート10 g/10 minを特徴とし、このグレードは薄肉容器、ジュエリーボックス、診断用実験器具に広く指定されています。Jucheng Precisionは、ISO 9001およびISO 13485の枠組みの下で、STYRON 678Dの加工において光学応力痕を回避することに優れています。社内の25台以上の5軸CNCマシンとクリーンルーム設備に支えられ、部品取り出し時の脆性クラックを防ぐ低応力ツールパスを実装しています。.

続きを読む

PS-Trinseo STYRON A-tech 1175

PS-Trinseo STYRON A-tech 1175 is an advanced technology high impact polystyrene (HIPS) engineered by Trinseo, distinguished by its exceptional environmental stress crack resistance (ESCR) against hydrocarbons and fats, alongside robust rigidity. Featuring a density of 1.05 g/cm³ and a melt index of 2.8 g/10 min, this grade is universally specified for large refrigeration liners, home appliance accessories, and food-contact enclosures. Jucheng Precision, under IATF 16949 and ISO 9001 quality frameworks, specializes in molding STYRON A-tech 1175 to yield high structural durability. Utilizing our 35+ advanced injection presses and in-house tooling, we prevent surface weld lines and optimize wall thickness distribution, verified by Zeiss CMM inspection.

続きを読む

Comprehensive Polystyrene (PS) Grades We Mold

We process high-performance Polystyrene resins from leading global chemical producers, catering to both high-clarity and heavy-impact applications:

PS Material Sub-Type 代表的なブランド&グレード 主な特性と利点
GPPS
(General Purpose)
• Trinseo STYRON 678D
• Sabic GPPS 150
• Chi Mei PG-33
• TotalEnergies GPPS 1540
Outstanding optical clarity, high stiffness, and brilliant gloss. However, it is relatively brittle. Ideal for medical labware, plastic cutlery, cosmetic containers, and jewel boxes.
HIPS
(High Impact)
• Trinseo STYRON A-tech 1175
• Sabic HIPS 638
• Chi Mei PH-88S
• TotalEnergies HIPS 8260
Modified with butadiene rubber to offer high impact toughness and dimensional stability. Opaque with a matte or satin surface. Ideal for electronic housings, toys, and structural components.

Applicable Molding Processes for Polystyrene (PS)

Polystyrene’s low shrinkage and easy melt flow make it highly adaptable to multiple specialized molding methods:

成形プロセス プロセス適合性と用途
標準射出成形 Excellent. Highly suitable for producing rigid, high-gloss consumer goods and robust structural frames with quick cycle times.
薄肉成形 High. Polystyrene’s easy flow properties allow for the high-speed production of thin-walled cosmetic containers and food packaging cups.
インサート成形 Good (Mostly with HIPS). Rigid metal screws or connectors can be easily molded into HIPS housings to build reliable electronic assemblies.
オーバーモールディング / マルチショット Good. HIPS is often overmolded with compatible grades of soft thermoplastic elastomers (TPE) to create durable handles and aesthetic grips.

Polystyrene (PS) Manufacturing & Tooling Guide

Polystyrene is amorphous and highly dimensionally stable, but it requires careful tooling parameters to avoid brittle cracking and surface splay:

  • 予備乾燥: Polystyrene has low water absorption (<0.1%). However, for high-gloss, crystal-clear GPPS applications, we pre-dry the resin at 70°C–80°C (158°F–176°F) for 1–2 hours to eliminate moisture marks.
  • 溶融温度: GPPS runs between 180°C and 260°C (356°F–500°F), while HIPS operates between 190°C and 240°C (374°F–464°F). Careful melt temperature control is vital to prevent thermal degradation of HIPS rubber elements.
  • 金型温度: Kept at 30°C to 60°C (86°F–140°F). Low mold temperatures shorten cycle times, while higher mold temperatures improve surface finish and decrease internal stresses.
  • Ejection System Design: Because GPPS is brittle, sharp corners and high local stresses can cause cracks during ejection. We design generous draft angles (at least 1° to 1.5°) and wide ejector pins to distribute forces evenly.
  • Weld Line Optimization: For clear GPPS parts, weld lines will compromise both aesthetics and optical transparency. Jucheng’s tooling engineers optimize runner systems and gates using DFM software to shift weld lines to non-visible areas.

Key Application Industries for Molded PS Parts

  • Medical & Laboratory Diagnostics (ISO 13485): Clear petri dishes, test tubes, microplates, disposable pipettes, and diagnostic cassettes.
  • 家庭用電化製品: TV housings, refrigerator door liners, audio cassette cases, remote control housings, and toy structural parts.
  • Cosmetic & Food Packaging: Highly transparent cosmetic jars, clear plastic cups, thin-walled food containers, and disposable cutlery.
  • Industrial & Appliance Housings: Refrigerator shelves, control panels, protective structural shells, and light-diffusing plates.

材料特性

Density (GPPS) 1.04 - 1.06 g/cm³
Density (HIPS) 1.03 - 1.05 g/cm³
メルトマスフローレート(MFR)(200°C/5.0kg) 2.0 - 15 g/10 min
Tensile Strength at Yield (GPPS) 40 - 55 MPa
Tensile Strength at Yield (HIPS) 20 - 35 MPa
Flexural Modulus (GPPS) 3,000 - 3,400 MPa
Flexural Modulus (HIPS) 1,600 - 2,200 MPa
Izod Impact Strength (Notched, 23°C - HIPS) 70 - 120 J/m
Light Transmission (GPPS) 88 - 90 %
Melting Temperature (Softening) 90 - 105 °C
線形成形収縮率 0.3 - 0.7 %
絶縁耐力 18 - 23 kV/mm
体積抵抗率 1.0E+16 Ω·cm
最大部品サイズ 1000 x 800 mm
最小部品サイズ 1 x 1 mm