Top Quality Plastic injection molding Supplier

Industry Leading Plastic Injection Molding Company for 20 Years

With 20 years of experience developing thousands of new injection molding products across multiple industries, Yixing Technology is your trusted partner for plastic injection molding services.

Injection molding is the main process for high-precision and large-scale plastic production. Based on different application needs, plastic molds can be classified by:

· Runner system – cold runner vs. hot runner

· Cavity count – single-cavity vs. multi-cavity (for high-volume production)

· Molding process – single-shot, two-shot/multi-shot, stack molding, gas-assisted

· Automation level – manual, semi-automatic, fully automatic

· Special processes – insert molding, over molding

Yixing Technology has manufactured thousands of such molds; we implement a comprehensive quality system to ensure every molded part achieves consistent excellence.

The material we worked

You have a wide variety of materials to choose from for injection molding. The following materials we can use for injection molding: 塑料材料清单

LDPE	PE	HDPE	TPE
PA6	PA12	PA66	PA66+30GF
PP	PP+30GF	TPU	TPR
PC	PS	ABS	EVA
PC/ABS	PLA	POM	ASA
PPS	PI	PEEK	TELFON

Industries we served

· Electronic product

· Automotive component

· Medical device

· Home appliance

· Building materials parts

· Smartphone accessories

· Other industrial plastic parts

General Tolerance for injection molding

Injection molding tolerances are essential for ensuring the quality and functionality of molded parts. They can be categorized into commercial and fine tolerances, depending on the level of precision required, which also influences the cost level.

Commercial tolerances are less precise, involving lower-cost molds and producing more affordable parts. Fine tolerances, also known as precision tolerances, offer a tighter tolerance range, which increases the cost of both the mold and the final parts.

Below are the tolerances you can expect for reference:

Table 1: Dimensional Tolerances (mm)

Type	Commercial				Fine
Type	1–20 mm	21–100 mm	101–160 mm	For every 20 mm over 160	1–20 mm	21–100 mm
ABS	0.100	0.150	0.325	0.080	0.050	0.100
ABS/PC
HDPE	0.125	0.170	0.375	0.100	0.075	0.110
LDPE
PA	0.075	0.160	0.310	0.080	0.030	0.130
PA GF 30%	0.060	0.120	0.240	0.080	0.030	0.100
PC
PMMA	0.075	0.120	0.250	0.080	0.050	0.070
POM	0.075	0.160	0.310	0.080	0.030	0.130
PP	0.125	0.170	0.375	0.100	0.075	0.110
SAN	0.100	0.150	0.325	0.080	0.050	0.100

Table 2: Straightness/Flatness Tolerances (mm)

Type	Commercial Tolerance		Fine Tolerance
Type	0–100 mm	101–160 mm	0–100 mm	101–160 mm
ABS	0.380	0.800	0.250	0.500
ABS/PC
PA	0.300	0.500	0.150	0.250
PA GF 30%	0.150	0.200	0.080	0.100
PC
POM	0.300	0.500	0.150	0.250
PP	0.850	1.500	0.500	0.850
SAN	0.380	0.800	0.250	0.500

Table 3: Hole Diameter Tolerance (mm)

Type	Commercial Tolerance				Fine Tolerance
Type	0.3	3.1–6	6.1–14	14–40	0.3	3.1–6	6.1–14	14–40
ABS	0.050	0.050	0.080	0.100	0.030	0.030	0.050	0.050
ABS/PC
HDPE	0.050	0.080	0.100	0.150	0.030	0.050	0.050	0.080
LDPE
PA	0.050	0.080	0.080	0.130	0.030	0.040	0.050	0.080
PA GF 30%	0.050	0.050	0.080	0.080	0.030	0.040	0.050	0.050
PC	0.050	0.050	0.080	0.080	0.030	0.040	0.050	0.050
PMMA	0.080	0.080	0.100	0.130	0.030	0.050	0.050	0.080
POM	0.050	0.080	0.080	0.130	0.030	0.040	0.050	0.080
PP	0.050	0.080	0.100	0.150	0.030	0.050	0.050	0.080
SAN	0.050	0.050	0.080	0.100	0.030	0.030	0.050	0.050

How to get high-quality molded parts?

With 20 years of experience developing thousands of new injection molding products, here's what we do:

1. Reduce shrinkage impact
Our engineer scientifically calculates shrinkage rates based on the material properties, ensuring finished parts meet exact dimensional requirements.
2. Optimized Ejection Systems
Our engineer designed reasonable draft angles and ejection mechanisms that ensure smooth, damage-free part ejection—reducing scrap rates and improving surface quality.
3. Balanced Wall Thickness Design
Use Moldflow software to analyze the impact of uneven thickness, and we minimize common defects such as sink marks and warpage, resulting in consistently high-quality parts.
4. Reduce the Weld Line and Ventilation effect
Through injection gate placement and optimized venting layouts, we preserve surface appearance where it matters most.
5. High-Efficiency Cooling Systems
Excellent cooling channel designs that achieve uniform, rapid cooling. This significantly reduces cycle times.

Our Work flow:

模具开发及交付流程表

Stage	Details
1. R&D Support	We support customer R&D. Make the files or improve the design if needed (UG, SolidWorks, ProE, Auto CAD etc.)
2. Mold Process	Mold design (MDF report) → check/approve → approved → make mold → do sample → sample confirmed → check the final mold quality ready to export.
3. Sample Modification	If the first sample is not satisfied with customer, we can modify mold and to meet customers’ requirements.
4. Sample Delivery	Produce the customer demand number, free shipping.
5. Final Delivery	Delivery goods by sea or by air, special requirements can be acceptable and base on the customers’ demands.