Transparent PET Plastic Thin Sheet PETG Sheet
Core Performance Parameters and Advantages
Basic Physical Properties
Density: 1.33-1.40 g/cm³ (Slightly higher than water, approximately half that of glass)
Color: Transparent (89%-92% light transmittance)
Transparent PET sheets have light transmittance close to optical glass (92%), appearing almost colorless to the naked eye.
Surface Condition: Smooth
Optical Properties
Light Transmittance: 89%-92% (When colorless and transparent, close to 92% of optical glass);
Haze: ≤1% (High clarity, no blurriness to the naked eye);
Refractive Index: 1.57-1.60 (Close to glass, natural light refraction, suitable for lens/light guide applications);
Yellowing Resistance: PET sheets without added UV absorbers will slowly yellow under long-term UV exposure.
Typical Applications: Transparent PET sheets are used for display racks, optical lenses, lightbox panels, and electronic screen protectors (requiring high light transmittance and no color difference). For higher weather resistance, modified PET sheets with added UV stabilizers can be selected (suitable for outdoor billboards).
Mechanical Properties (Moderate Strength + Good Rigidity)
Tensile Strength: 50-70 MPa;
Flexural Strength: 80-110 MPa;
Elastic Modulus: 2000-3000 MPa;
Elongation at Break: 30%-50%;
Notched Impact Strength: 15-30 kJ/m² ;
Hardness (Shore D): 80-90.
Typical Scenarios: Transparent PET sheets are used for components requiring "a certain strength + transparent display" (such as display rack columns, equipment protective covers). Their rigidity can replace some lightweight metals (such as aluminum alloys), while their toughness prevents brittle fracture.
Heat Resistance (Medium Temperature Stable)
Glass Transition Temperature (Tg): 68-78℃ (critical temperature at which molecular chains begin to soften);
Heat Deflection Temperature (HDT, 1.82 MPa load): 60-85℃ (short-term withstand 90-100℃);
Melting Point: 245-260℃ (processing temperature is typically 260-280℃);
Continuous Use Temperature: -20℃ to 70℃ (long-term stability), short-term withstand 80-100℃ (e.g., short-term high-temperature conditions).
Limitations: Transparent PET sheets are not suitable for long-term use in environments >80℃ (high temperatures intensify molecular chain movement, reducing mechanical properties), but they can maintain basic functionality even with short-term resistance to around 100℃ (e.g., hot water bath displays).
Polyethylene Terephthalate Sheets
Chemical Resistance (Strong Corrosion Resistance)
Acid and Alkali Resistance: Stable at room temperature to dilute hydrochloric acid (10%), dilute sulfuric acid (10%), and sodium hydroxide (10%); slowly corroded by strong oxidizing acids (such as concentrated nitric acid and concentrated sulfuric acid) and strong alkalis (such as sodium hydroxide above 40% in high-temperature environments);
Organic Solvent Resistance: Stable to water, alcohols, and weakly polar oils in short-term contact; however, it will swell or dissolve in aromatic hydrocarbons, ketones, and esters;
Water/Water Vapor Resistance: Water absorption rate is only 0.05%-0.1% (extremely low; dimensions remain almost unchanged after long-term immersion in water or steam).
Typical Applications: Transparent PET sheets are suitable for non-corrosive media contact parts in chemical equipment (such as linings for weak acid and alkali storage tanks) and weather-resistant protective covers for outdoor equipment (such as street light bases). Its chemical resistance is superior to ordinary plastics (such as PVC, which is sensitive to certain solvents).
Electrical Properties (Good Insulation)
Volume Resistivity: >10¹⁵ Ω·cm;
Dielectric Strength: ≥20 kV/mm;
Dielectric Constant: 3.0-3.2.
Typical Applications: Transparent PET sheets can be used for housings of low-voltage equipment (such as socket panel supports) and isolation boards for electronic components (balancing insulation and lightweight).
Other Characteristics
Processability: Can be processed into complex shapes (such as curved display racks and irregularly shaped protective covers) through die-cutting, stamping, and thermoforming (such as vacuum forming and hot pressing).
Hygiene: Meets food contact safety standards (such as FDA standards) and can be used for food display racks and cosmetic display cabinets (transparent PET sheets with non-toxic additives must be selected).
Environmental Protection: Recyclable.
