: High-precision engineering, typically reserved for highly stable, advanced amorphous plastics or components with high filler concentrations.
The molder must design the steel mold to compensate for shrinkage. Under TG5, the allowed deviation from nominal shrinkage is tightly managed. For example, if the material datasheet says 0.5% shrinkage, the molder cannot let real shrinkage drift between 0.4% and 0.6%—TG5 forces a narrower band (e.g., 0.47%–0.53%). din 16742 - tg5
Understanding DIN 16742: The Standard for Plastic Tolerances Introduced in 2013 to replace the aging DIN 16901, For example, if the material datasheet says 0
Use TG5 only for dimensions where it is functional, not for every part of the drawing. : High-precision engineering
While TG1 or TG2 might be used for stable engineering plastics like ABS or Polycarbonate (PC), TG5 is frequently applied to:
: Reaching this group usually requires more rigorous process control and quality assurance than general-purpose molding. Comparison within the Standard Tolerance Group Typical Application Classification TG4 Critical interfaces, bearing seats High Precision TG5 Functional fits, standard precision parts Accurate Production TG6 General housings, enclosures Standard Production TG7/8 Large cosmetic covers, foam molding Reduced Precision Practical Application Tips