Dimensional stability

Illustrated explanation

Fiber fraction and finished-part dimensions need separate checks

2Dimensional stability
Fiber fraction and finished-part dimensions need separate checksCallout 1 separates PA66 polymer identity from the GF30 glass-fiber mass-fraction marking. Callout 2 compares a part outline before and after defined conditioning, identifying dimensional changes without specifying their magnitude or direction. Current term: Dimensional stability, callout 2. 1 Read the compound marking PA66 – GF30 Base polymer Fiber mass fraction Schematic fibers; no fraction shown to scale 2 Measure the finished part Compare the same dimensions Before After Temperature · moisture · time · load Change may increase or decrease a dimension
  1. Glass-fiber content

    The designation separates base polymer from fiber content. The declared mass fraction differs from volume fraction, and the percentage alone does not describe orientation, length or finished-part performance.

  2. Dimensional stabilityThis term

    Compare the same dimensions before and after specified conditioning or exposure. Temperature, moisture, load, time and allowable dimensional change all belong in the assessment.

A compound label identifies a polymer and its declared glass-fiber fraction. A separate before-and-after outline shows that part dimensions must be measured under specified conditioning and service exposure.

Conceptual material and dimensional comparison, not a recipe, fiber-orientation measurement or measured deformation. The illustrated outlines do not predict a particular resin grade or finished cable-gland response.

ReferencesISO 1043-2:2011 — Plastics — Fillers and reinforcing materialsISO 11469:2016 — Generic identification and marking of plastics productsISO 62:2008 — Plastics — Determination of water absorptionISO 1101:2017 — Geometrical tolerancing