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Why Your Shoes Are Still Heavy — Even Using the Same AC Foaming Agent?

Apr 14,2026

Many manufacturers face the same frustrating problem:

👉 “We are using AC foaming agent, but the shoes are still heavy.”
👉 “Others can achieve lightweight results — why can’t we?”

The truth is simple:

Using AC does not guarantee lightweight results.

The Real Problem: It’s Not the AC — It’s the System

AC foaming agent only provides gas generation.

But lightweight performance depends on:

How the gas is released

How the foam expands

How the structure is controlled

👉 Without proper control, the result is:

Dense structure

Poor expansion

Heavy final product

Common Reasons Why Your Foam Is Not Light

1. Decomposition Timing Is Not Matched

If AC decomposes too early or too late:

Gas escapes before forming structure

Foam expansion becomes unstable

👉 Result: low expansion efficiency

2. Poor Cell Structure Control

Even if foaming occurs, problems may include:

Large, uneven cells

Collapsed structure

Inconsistent density

👉 Result: limited weight reduction

3. Lack of System Balance

Many factories adjust only the AC dosage.

But in reality:

Foaming is a coordinated system — not a single-material adjustment

Without proper balance:

Expansion becomes unstable

Structure cannot be controlled

Performance becomes inconsistent

👉 Result: you cannot reach target weight

4. Not a Material Issue — A Matching Issue

Many manufacturers focus on the material itself.

But in reality:

The difference is not what you use —
it’s how well the system is matched.

Without proper formulation balance:

Gas generation is wasted

Expansion is restricted

Lightweight performance cannot be achieved

👉 Same AC, completely different results.

Why Some Factories Achieve Better Results

The difference is not in the AC itself —
it’s in how the system is designed.

Factories that achieve:

Lower density

Better rebound

Stable production

are using optimized formulation, not just raw materials.

From Trial-and-Error to Controlled Results

Many manufacturers still rely on:

Repeated testing

Manual adjustments

Experience-based guesses

This leads to:

Time loss

Material waste

Unstable quality

👉 The real upgrade is not changing materials —
it’s changing the approach.

Customized for Your Production — Not a Generic Formula

Every factory is different.

That’s why performance improvement requires a tailored solution, based on:

Target density and hardness

Product type (slippers, soles, etc.)

Production conditions

Raw material combinations

👉 The goal is simple:
Make the system work for your production — not against it.

Applications

This challenge is common in:

PVC slippers

PVC air-blowing soles

EVA foam midsoles

Lightweight footwear

Conclusion

If your shoes are still heavy, even with AC foaming agent —

The problem is not what you are using,
but how it is working.

Work with RELYONTECH

Struggling with foam weight, structure, or consistency?

We support manufacturers with practical formulation solutions and technical guidance for both PVC and EVA applications.

📩 Contact us for technical support & samples:
salerelyon@gmail.com

🌐 www.relyon-tech.com

About RELYONTECH

RELYONTECH provides one-stop solutions for PVC & EVA compounding and footwear production, helping manufacturers achieve:

Lower density

Better foam structure

Stable and scalable production