Solving Bristle Shedding and Ferrule Detachment

Client Background

A private label cosmetics brand had been sourcing a 16-piece brown makeup brush set from another supplier. The set included face brushes, eye brushes, and detail brushes with brown handles, gold ferrules, and nylon bristles.

After several batches, the client received repeated complaints from end customers:

Bristles shed during use and after washing

Ferrules came loose and detached from the handles

The client needed a makeup brush manufacturer that could match their original sample and fix these quality problems at the production level.

Root Cause Analysis

Before sampling, our engineering team reviewed the client's defective samples and identified the likely causes:

Bristle shedding: insufficient adhesive at the bristle root, and nylon filaments not properly rounded

Ferrule detachment: glue bonding only to the painted surface of the handle, weak bonding strength, and a loose fit between ferrule and handle

Our Solution

Bristle Shedding Solution

To stop shedding, we:

Applied additional adhesive at the bristle root

Used nylon filaments with proper tip rounding

Added a combing and tapping test before packing

After adjustment, the nylon bristles performed better than the client's original sample in both color consistency and shedding resistance.

Ferrule Bonding Improvement

We changed the ferrule bonding process:

Switched from single-component glue to two-component epoxy adhesive

Removed only the paint from the top section of the handle where it connects to the ferrule, exposing the raw wood grain so the adhesive could penetrate into the wood texture

Increased adhesive coverage at the ferrule-handle joint

Added a 24-hour curing process before assembly

We then ran a pull-off test on the assembled brushes to confirm the ferrule would not detach under normal use.

A Key Detail: Preparing the Handle Surface for a Stronger Bond

The handles are painted. If glue is applied directly to the painted surface, it only bonds to the smooth paint layer, and the ferrule can come loose over time.

To prevent this, we remove only the paint from the top section of the handle where it meets the ferrule. This exposes the raw wood grain in that area, allowing the adhesive to penetrate into the wood texture instead of sitting on the paint. As a result, the ferrule forms a much stronger and more durable bond with the wooden handle.

This step is one of the reasons our makeup brush ferrules stay firmly attached and do not detach in normal use.

The Result

The client approved the samples and placed their first order. Since then, they have placed repeat orders every two months, with each order reaching 100,000 pieces.

The bristle shedding and ferrule detachment issues reported with the previous supplier have not recurred in mass production.