Filament Test

Filament Tests

Filament testing ensures that every batch meets performance, durability, and consistency standards required for paintbrush and industrial applications. These tests help identify mechanical strength, dimensional stability, moisture behavior, and long-term reliability.

Moisture Test

This test aims to ensure that the resin's moisture content falls within acceptable limits, as excessive moisture can adversely affect the quality of the final product and the processing itself. By measuring and controlling moisture levels, we prevent issues like bubbles, cracks, poor adhesion, and other defects that can arise from moisture-related problems during filament extrusion.

Tensile Strength & Elongation Test

involves stretching a sample of the filament until it breaks while measuring the applied force and the extent of stretching. This test helps determine the filament's strength and ability to withstand stretching forces without breaking. It's important because it provides crucial information about the mechanical properties of the filament, including its tensile strength (maximum force it can bear), elongation (how much it can stretch before breaking), and overall durability

Bend Recovery Test

T Involves assessing the filament's ability to return to its original shape after being bent or deformed. Most brushes fail over time due to bend recovery. This leads to filaments becoming so bent that they cannot service their original purpose anymore. This test measures the filament's flexibility and its tendency to maintain its intended form after bending. At Universal Filaments, we use two different test methods:

Dupont Method:
China Method:

Ovality Test

An ovality test on plastic filament involves measuring the cross-sectional shape of the filament to determine if it deviates from a circular shape and becomes oval. This test assesses the filament's dimensional consistency.

Shrinkage Test

FA shrinkage test on plastic filament involves measuring the change in dimensions of the filament after it has been heated and cooled. This test helps determine the filament's susceptibility to shrinking during temperature changes. A well stabilized filament should not shrink very much at all.

Taper Ratio Test

A taper ratio test on paintbrush filament involves measuring the gradual decrease in bristle thickness from the base to the tip of the paintbrush. This test assesses the brush's tapering profile. It's important because the taper ratio directly influences the brush's performance. A well-designed taper allows for controlled paint application, smooth strokes, and better brush flexibility.