Guangdian Technology – Precision Injection Mold Manufacturer in China

Plastic surface finishes guide for injection molded parts. Learn SPI, VDI, texture selection, Ra values, and finish standards for automotive lighting and optical plastics.

Injection molding tolerance determines whether plastic parts fit, seal, and function correctly. This guide explains what tolerance is, common standards like DIN 16742 and ISO, factors such as material shrinkage and mold accuracy, typical tolerance ranges, and how to control tight tolerances in automotive lighting molds. Learn how Guangdian Technology achieves ±0.01 mm precision through high-accuracy mold design, 5-axis CNC machining, EDM, and CMM inspection.

Family molds are used in injection molding to produce multiple different parts in one cycle using a single mold. This article explains how family molds work, their advantages, engineering challenges, runner balancing, cooling design, shrinkage control, and when they should not be used—especially for optical or high-precision parts like automotive lighting. It also shows how Guangdian Technology evaluates whether a project is suitable for a family mold through DFM and moldflow analysis to ensure both cost efficiency and product quality.