Standard precision . Used for technical parts where fit and function are critical but extreme micro-precision is not required. TG6: Coarse precision, typical for packaging materials.
*Note: Exact limits depend heavily on whether the specific feature is bound to a single tool cavity or spans across a parting line. 3. Factors Leading to a Tg5 Classification
The parent standard, ISO 20457, outlines general principles for the recovery of plastic waste, including source separation, collection, sorting, and various recycling technologies (mechanical, chemical, and organic recovery). While comprehensive in scope, the standard inherently operates at a macro level. It advises what should be done but leaves significant ambiguity regarding how to verify the quality of sorted waste or ensure that a recycled pellet from one facility is functionally equivalent to that from another.
replaced the older ISO 8062 and is the definitive global standard for plastic moulded parts. It establishes tolerance grades (TG) based on: Material Groups : Thermoplastics, elastomers, and thermosets. Manufacturing Conditions : Process stability and tool precision. Part Dimensions
: Whether using a CMM (Coordinate Measuring Machine) or a manual fixture. Why Choose TG5? Iso 20457 Tg5
TG5 strikes the perfect balance between high functionality and manufacturing cost. While it is not "ultra-precision," it is vastly superior to the loose tolerances (TG6–TG7) typically reserved for basic, non-structural packaging.
| Standard | Title | Purpose | | :--- | :--- | :--- | | | ITS Reference Architecture | Defines the "Viewpoints" of an ITS system (Functional, Physical, Communications). This is the core architecture standard. | | ISO 14816 | General Requirements for ITS Data Dictionaries | Sets the rules for how to write definitions for data used in transport. | | ISO 14817 | ITS Data Registry | Specifies the requirements for a central registry where all standardized data elements are stored and managed. | | ISO 21217 | ITS Station Architecture | Defines the architecture for the communications unit (the "box") inside a car or at the roadside. |
Ask your supplier: "Does your Certificate of Analysis follow ISO 20457 TG5?" If they look confused, you have found the gap in your quality chain.
The standard has unified the global plastics industry, giving engineers a reliable system to measure and predict the manufacturing feasibility of molded parts. By designing parts to the TG5 tolerance group, manufacturers can guarantee high-quality, functional components for demanding engineering applications without ballooning tooling and production costs. Standard precision
Before any steel is cut, mold flow software should be utilized to simulate how the molten plastic will fill the cavity. This analysis helps engineers predict shrinkage, identify potential warpage, and ensure that the part will cool uniformly within the TG5 tolerance range. 3. Geometric Dimensioning and Tolerancing (GD&T)
This article provides a comprehensive overview of the standard, detailing what TG5 entails, how to apply it, and how it compares to other manufacturing tolerances.
She jumped. Standing in the doorway of the silent conference room was Kenji Tanaka, her deputy. He held a coffee cup in one hand and a 3D-printed femur implant in the other.
“Elara.”
A small functional feature of might require a tight tolerance window of roughly ±0.08 mm .
A brand owner wants r-PET for direct food contact. TG5’s highest grade (Premium) still does not guarantee food safety because migration testing is outside scope. The brand must layer TG5 with EFSA positive list requirements. Here, TG5 is necessary but insufficient.
“That’s a million dollars in scrapped fuselage brackets for Airbus,” Kenji said. “And for this?” He tapped the femur. “That’s a six-month surgical delay for a seven-year-old in Osaka.”
For production part approval, the dimensional report must clearly differentiate between "W" and "NW" features, as their tolerances and inspection methods differ. This prevents disputes and ensures that both buyer and supplier are aligned on what constitutes an acceptable part. *Note: Exact limits depend heavily on whether the
: Dimensions formed by the same mold half (tool-specific) are generally easier to control than those formed across different mold parts or moving sliders.