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Plastic Melting Temperature and Injection Molding Temperature Chart

The intricacies of mold temperature in the injection molding process are pivotal to achieving precision and quality in the final product. A fundamental aspect of this process is the melting temperature of plastic resin, which must be carefully managed to ensure optimal flow and filling of the mold.


Plastic resin's melting temperature is a critical parameter that dictates the ease with which it can be injected into a mold. This temperature varies depending on the type of resin used and is essential for determining the appropriate processing conditions for each material.


Table of Plastic Material Melting Point, Injection Molding Temperature, Baking Temperature and Drying Hours

Plastics Short Name

Plastic Melting Temperature Range(℃)

Plastic Mold Temperature(℃)

Material Drying Temperature(℃)

Plastic Drying Hour (h)

ABS

180-250

50-90

80-90

2~3

PP

190-270

30-80

40-80

2~3

PU

195-230

20-40

80-90

2~3

HDPE

200-260

30-70

NO need

0

LDPE

180-240

20-60

NO need

0

ACETAL

180-210

50-120



POM

160-280

10-80

60-70

2~3

HIPS

170-250

10-80

60-80

2~4

PVC

180-210

30-50

40-70

2~3

PMMA

180-260

50-80

70-80

3~5

SAN

180-270

40-80

70-80

2~4

PBT

220-260

50-100

120-140

3~4

PBT Glass Fiber

230-270

80-110

120-140

3~4

PA6

230-260

60-90

75-90

4~6

ABS+PC

240-290

90-110

100-120

2~4

PBT+GF

250-270

60-100

120-140

3~4

PA66

260-290

60-100

75-90

3~5

PET

260-290

120-140

120-160

2~4

PP+GF

260-280

50-80

40-90

2~3

PA6+GF

270-300

70-120

75-80

4~6

PC

280-320

80-100

110-120

2~4

PEEK

340-390

120-150

140-150

2~4

SAN+30% GF

250-270

50-70



PS+30% GF

250-290

40-80



PP+30% GF

240-290

30-50



PP+30% GF Talc Filled

250-290

40-80



NYLON 11

220-250

40-110



NYLON 12

190-200

40-110



CAB

170-240

40-50



ABS/PC ALLOY

245-265

40-80



* The temperature shown is for reference, it may have some different from different manufacturer .

 


Maintaining an appropriate mold temperature is not just about reaching a certain degree; it's about ensuring that this temperature is uniformly distributed across the entire cavity surface. This uniformity is crucial because any variations can lead to differential shrinkage and internal stresses within the molded part. Such inconsistencies often result in deformation or warping upon ejection from the mold, compromising the structural integrity and aesthetic quality of the product.


The mold temperature's influence extends beyond just the physical properties of the molded item; it also impacts the molding cycle time and overall efficiency of the production process. Starting from the lowest suitable mold temperature for the specific plastic resin used is a wise approach. However, adjustments are often necessary based on real-time observations of product quality and performance.


In conclusion, understanding and controlling the melting temperature of plastic resin, alongside ensuring even distribution of mold temperature, are essential for successful injection molding. These factors work in tandem to dictate not only the quality of the molded parts but also the efficiency and cost-effectiveness of the manufacturing process.


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