About us

Xiamen Yongjinfa Sports Life Co., Ltd short name YJF, we are specialized in sports equipment especially for the carbon fiber products, like carbon frame, wheels, rims and components for road bikes, mountain bikes, electric bikes.

YJF is experienced in carbon fiber products, having professional R&D team and production team, we could supply service from products design, development, production, sales and aftersales.

Customer’s care is our top priority, 100% satisfaction is our goal.

We expect the Win-Win business with you.

Welcome OEM, wholesaler, retailer and end-user for further discussion.

Advanced EPS Technology

EPS (Expandable Polystyrene System)

What is EPS?

EPS stands for Expandable Polystyrene System. It is one kind of the new technology to produce carbon frames.
When we use the traditional technology to produce carbon frames, we need to make the material into separate pieces during the layup.
However, using EPS process allows us to make carbon frames in one piece and make them lighter and stronger.
EPS production process is in an effort to both increase rigidity and safeness as well as to decrease the overall weight of the frame.
Increased compaction will makes frames more rigid which allows the riders to have greater control of the bike and lose less energy due to frame flex laterally.

Benefits of EPS

The EPS process will eliminate extra and unnecessary materials for our carbon frames while the compaction of carbon layers is optimized;
therefore, it will translate into an overall weight savings.
This process also eliminates small imperfections as the result of traditional frame production methods.
These imperfections are often the causes of structural failure and they will increas the risk for riders.
By eliminating these structural imperfections through EPS process, our carbon frames have improved the safety and been above the industry standard.

Application

The EPS system consists in laminating carbon sheets around Polystyrene forms, with perfectly smooth surfaces,
and leaving these forms inside the mold during the pressure phase of production.
The mold expands both due to increased heat; in addition to added air pressure leaving a controlled and optimized thickness of carbon material
throughout the frame. The polystyrene mold is then removed when the production process is completed.