Polyethylene Terephthalate PET Polymer Sheet PET Plate
Excellent toughness (impact resistance and stress cracking resistance)
The impact strength of the simple supported beam is ≥30-50 kJ/m² (ordinary PET is only 10-20 kJ/m², easy to crack), the elongation at break is ≥30% (ordinary PET is ≤20%), and it can withstand certain external impacts (such as vibrations during logistics and transportation) without breaking (suitable for food packaging drop tests).
The stress cracking resistance is significantly improved (silver streaks or cracks are not likely to appear in organic solvents or high temperature environments), and the long-term reliability is high.
Good processing fluidity and moldability
The melt flow rate (MFR, under 260℃/2.16kg conditions) is 10-30 g/10min (ordinary PET is only 5-15 g/10min), with better fluidity, and it is easy to make thin and uniform sheets (thickness range 0.1-3 mm, common 0.5-1.5 mm) through extrusion process, and the molding cycle is short (high production efficiency).
Chemical corrosion resistance
It is stable to most acids (such as dilute sulfuric acid, hydrochloric acid), alkalis (such as dilute sodium hydroxide solution), salt solutions and common organic solvents (such as ethanol, acetone, edible oil) (tolerance to pH 2-12), and does not swell, dissolve or chemically react (ordinary PET is easily hydrolyzed in strong acids/alkalis, and PVC is easily swollen in oily solvents).
It is particularly suitable for scenes with contact with food (such as oils and fats), cosmetics (such as alcohol) or industrial chemicals (such as weak acid cleaning agents).
Dimensional stability and temperature resistance
The linear thermal expansion coefficient is about 7×10⁻⁵/℃ (about 1/2 of glass), and the dimensional change rate is ≤0.3% in the range of -40℃ to 80℃ (ordinary PET is 0.5%-0.7%), which is suitable for precision parts with strict tolerance requirements (such as electronic component carrier boards).
The glass transition temperature (Tg) is about 78-85℃ (ordinary PET is 70-75℃), the heat deformation temperature (HDT, under 1.82 MPa load) is 65-80℃ (short-term resistance 100-120℃), and the long-term use temperature is -40℃ to 70℃ (ordinary PET is prone to become brittle due to high temperature crystallization after long-term use).
Processing Technology and Precautions
Conventional Processing Methods
- Cutting: Laser cutting is recommended (for high precision, smooth edges, and suitable for complex shapes) or circular saw/knife cutting is recommended (for standard sheet materials, edges should be ground and deburred).
- Drilling: Use a high-speed steel or carbide drill bit (the speed should not be too high to prevent heat buildup and melting). Chamfer the hole edges to prevent stress cracking.
- Bending: Soften the material by heating (preheating to 60-80°C) before bending to avoid brittle cracking at room temperature. The recommended bending radius is ≥ 3 times the sheet thickness.
- Hot Pressing: Heat the mold (120-150°C) to form curved or three-dimensional structures (such as the curved surface of a protective cover).
Key Considerations
- Temperature Control: Avoid prolonged exposure to heat sources exceeding 100°C (such as soldering irons and high-temperature knives) during processing, as this may cause the sheet to soften and deform.
- Stress Release: After cutting or bending, it is recommended to allow the sheet to rest for at least 24 hours to allow for natural stress release (to prevent edge cracking during subsequent use).
- Surface Protection: White surfaces are susceptible to scratching (especially high-gloss finishes). Applying a protective film or spraying a clear coat after processing is recommended to improve wear resistance.
- Color Consistency: White PET-P may exhibit slight color variations from batch to batch (it is recommended to confirm the color number or provide a sample when purchasing).
