Dimensional stability of plastics refers to a component’s ability to preserve its required size, shape, and function over time. Thermal expansion, moisture absorption, molding shrinkage, residual stress, crystallinity, fiber orientation, wall thickness, mold design, process settings, and assembly loads can all affect final dimensions. Reliable precision parts require careful material selection, design-for-manufacturing planning, controlled mold engineering, stable processing conditions, and validation under real service conditions.
