In makeup brush manufacturing, the ferrule crimping process is the structural step that determines shedding rate, brush stability, and long-term durability. Although invisible to end-consumers, buyers sourcing in bulk must understand how crimping quality affects product lifetime and brand reputation.
1. What Is Ferrule Crimping?
Ferrule crimping is the compression of the metal ferrule around the bristle bundle and handle. It locks three critical components together:
Bristles
Glue core
Handle end
Good crimping prevents wobbling, fiber loss, and structural failure.
2. The Three Types of Crimping Used in OEM Production
1) Single Crimp
Used on small, lightweight brushes
Suitable for non-intensive applications
Lower cost
2) Double Crimp (Industry Standard)
Stronger structural lock
Better resistance to pulling
Ideal for mid- to high-end brands
3) Deep Crimp (Premium/Professional Grade)
Increased ferrule depth
Higher glue penetration
Superior stability
3. Engineering Factors That Determine Crimping Strength
Ferrule Material:
Copper ferrules hold shape better than aluminum.
Wall Thickness:
Thicker walls = stronger lock.
Crimping Machine Pressure:
Precision-controlled machines ensure uniform pressure.
Glue Type & Volume:
High-temperature cosmetic-grade glues prevent internal loosening.
4. How Poor Crimping Causes Defects
Weak crimping leads to:
Shedding
Ferrule loosening
Handle detachment
Uneven brush shape
Structural instability during washing
These issues increase return rates and reduce long-term brand value.
5. Buyer Quality Checklist
Before mass production:
Inspect depth of crimp
Test ferrule rotation resistance
Conduct 1kg fiber pull test
Wash cycle test (3¨C5 times)
Conclusion
Ferrule crimping is the backbone of brush durability. Buyers should always evaluate crimping quality to avoid long-term structural issues in bulk cosmetics tools.