Comparison Table of Softening Temperature and Application Scenarios of Acrylic Sheet
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Comparison Table of Softening Temperature and Application Scenarios of Acrylic Sheet
Acrylic sheets exhibit completely different states at different temperatures - at room temperature, they are hard and transparent "plastic glass". When heated to 70-80 ℃, they begin to soften and can be locally bent. When heated to 140-180 ℃, they can be bent into any shape as a whole, but once they exceed 270 ℃, they will decompose and turn black. Different temperature ranges correspond to different processing methods and usage scenarios.
For buyers and users, understanding what temperature can do can not only help them choose the appropriate board, but also avoid processing failures or damage caused by improper temperature control. This article will focus on temperature and provide a clear overview of the state changes, corresponding uses, and precautions of acrylic sheets in different temperature ranges.
The characteristics of acrylic sheet in different temperature ranges determine its application in different scenarios:
Normal temperature range (<50 ℃) - safe zone for daily use
Within this temperature range, acrylic sheets maintain their glassy and brittle properties, with high light transmittance and stable dimensions. This is the safest temperature range for daily use of acrylic products. Most acrylic products such as indoor display stands, advertising light boxes, photo frames, and handicrafts work within this temperature range.
Heating range (50-80 ℃) - approaching the critical deformation zone
Acrylic sheets begin to exhibit thermal sensitivity in this temperature range. Local hot bending processing (such as heating the edges with a hot air gun or mold rod) can be carried out at 70-80 ℃. But this is also a temperature range that needs to be monitored in daily use - if acrylic products are kept at this temperature for a long time, slight deformation may begin to occur.
Hot forming zone (140-180 ℃) - the main processing and forming zone
Heating acrylic sheet to this temperature range will make the material soft and plastic, allowing for overall hot bending, vacuum forming, and other processing. This is a common technique for making curved display stands, curved light box panels, and irregular decorative parts.
Melting processing zone (160-200 ℃) - injection molding and extrusion processing zone
Acrylic reaches a flowable state within this temperature range, making it suitable for mass production methods such as injection molding and extrusion molding. Before injection molding, the raw materials need to be dried at 80-90 ℃ for 3-4 hours to remove moisture and prevent the formation of bubbles during injection molding.
Decomposition interval (>270 ℃) - Dangerous exclusion zone
Acrylic will undergo chemical decomposition above 270 ℃, causing the material to turn black and release harmful gases. During processing, it is necessary to strictly avoid temperatures reaching this range.
The following is a complete temperature index comparison table for acrylic sheets, which is convenient for you to refer to in actual material selection and processing:
Temperature range, key temperature, material state, corresponding usage
Daily use<50 ℃ glass state, hard and transparent indoor display, light box, photo frame and other daily use
When approaching deformation at 50-65 ℃, thermal sensitivity should be avoided by staying at this temperature for a long time
The critical deformation temperature of 65-95 ℃ and the maximum continuous use temperature are the most important reference indicators for actual material selection
Local hot bending at 70-80 ℃, the edge begins to soften, and local hot bending forms a right angle and small curvature
Heat deformation is about 96 ℃. Under stress, significant deformation begins when there is a load
The glass transition is about 104-105 ℃, which marks the beginning of the overall softening of the material from the glassy state to the highly elastic state
Vicat softening is about 90-113 ℃, which is the temperature at which the material begins to significantly soften
Overall hot bending at 140-180 ℃, soft and plastic, hot bending and vacuum forming
The starting point of flow injection molding and extrusion processing starts at a flow temperature of about 160 ℃
Melting processing temperature range of 160-200 ℃ for flowable viscous flow injection molding and extrusion
Thermal decomposition>270 ℃ decomposition turning black processing restricted area
4、 The use of acrylic sheet
Acrylic sheets have a wide range of applications under different temperature characteristics:
Advertising signage and display: lightboxes, signs, display stands, crystal characters, etc. Acrylic has a light transmittance of 92%, soft light, and clear vision, making it one of the preferred materials for modern advertising display.
Architecture and interior decoration: partitions, shop windows, skylights, wall panels, etc. Acrylic has excellent weather resistance, especially suitable for outdoor environments.
Transportation and Industry: Automotive lighting fixtures, equipment protective covers, instrument panels, etc. Acrylic has better impact resistance than ordinary glass, with a density only half that of glass.
Medical and bathroom: incubators, surgical instruments, bathtubs, shower rooms, etc.
Home and cultural creativity: aquariums, photo frames, handicrafts, fruit plates, etc.
Q1: At what temperature can acrylic sheets undergo hot bending processing?
Local hot bending can be carried out at 70-80 ℃; The overall hot bending requires heating to 140-180 ℃. The baking temperature during hot bending is generally controlled at around 160-170 ℃. If the temperature is too low, it cannot bend to the desired curvature, and if the temperature is too high, it will cause bubbles or discoloration on the surface of the board.
Q2: How high temperature can acrylic sheets withstand in daily use?
The maximum continuous use temperature of acrylic is between 65-95 ℃. The upper limit of safe temperature for long-term use is usually not recommended to exceed 70-80 ℃, as the board may begin to soften and deform beyond this temperature.
Q3: What is the difference between the thermal deformation temperature and Vicat softening point of acrylic sheet?
The hot deformation temperature (about 96 ℃) is the temperature at which a material begins to deform significantly under stress; The Vicat softening point (approximately 90-113 ℃) is the temperature at which a material begins to significantly soften under specific testing conditions. Simply put, the hot deformation temperature is closer to the actual load-bearing scenario in use, and the Vicat softening point is closer to the softening characteristics of the material itself.
Q4: At what temperature does acrylic sheet decompose?
The thermal decomposition temperature of acrylic is about 270 ℃ or above. Beyond this temperature, the material will undergo chemical decomposition, turn black, and release harmful gases. During processing, it is necessary to strictly avoid temperatures reaching this range.
Q5: Is there a difference in heat resistance between acrylic sheets of different colors?
Dark colored acrylic absorbs more heat and heats up its surface faster than light colored materials during processing and use. Therefore, in outdoor high-temperature environments, dark colored boards are more likely to reach the softening temperature than light colored boards, and the risk of deformation is relatively higher. It is recommended to prioritize using light colored boards for outdoor applications.
Q6: What are the advantages of Zhejiang Yifang in the heat resistance quality of acrylic sheets?
The cast acrylic sheets produced by Zhejiang Yifang New Materials use high-quality PMMA raw materials, with a stable glass transition temperature of around 104-105 ℃. Strict casting process control ensures high molecular weight of the sheet (up to 100000-150000 g/mol), exhibiting better dimensional stability and creep resistance in the temperature range close to Tg.
| product type | pet、ps、acrylic、acrylic mirror、pvc sheet,acrylic sheet |
| thickness | 0.35-300mm |
| Styles | 1220*2440,1220*1830,500*900,50*60,960*1950,700*900/Customization of various specifications and sizes |
| delivery time | 5-8day |
| manufacture | Yifang |
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