Low Profile Additives for Zero-Shrinkage Molding
Advanced thermoplastic additives that eliminate mold shrinkage in compression molding and pultrusion. Essential for achieving Class-A automotive surfaces and precision-molded parts.
The Science of Dimensional Control
Lechi Low Profile Additives (LPA) are thermoplastic polymers that phase-separate during the curing process to counteract the natural volumetric shrinkage of unsaturated polyester resins. By carefully balancing the expansion of the thermoplastic phase against the contraction of the thermoset matrix, our additives enable molders to achieve zero or even negative shrinkage. This technology is critical for automotive body panels, electrical housings, and any application where surface waviness or sink marks are unacceptable. Our portfolio includes PS, PVAc, PMMA, and Saturated Polyester systems, each optimized for specific performance requirements.
Quick Stats
Application Fields
Precision Surface Technology
Controlled Phase Separation
Engineered molecular weight distribution ensures uniform additive dispersion and predictable shrinkage compensation across the entire part.
Surface Gloss Enhancement
PMMA and Saturated Polyester grades deliver mirror-like surface gloss without the need for in-mold coating or post-painting.
Mechanical Property Balance
High-impact PS grades maintain or improve toughness while delivering low-profile performance, ideal for automotive safety components.
Manufacturing Process Compatibility
Our Low Shrinkage Additives series is meticulously formulated to integrate seamlessly into your existing manufacturing infrastructure, from high-precision molding to heavy-duty winding.
Low Shrinkage Additives Specifications
Complete technical data for our low shrinkage additives lineup. Select the model that best fits your industrial requirement.
| Model | Chemical Type | Viscosity (mPa·s) | Gel Time (min) | Molding Process | Application Field | Characteristics |
|---|---|---|---|---|---|---|
LC-3801 | General PS | 9000-15000 | — | Compression molding, Pultrusion | SMC/BMC | Plasticity, colorable |
LC-3803 | General PS | 4000-6500 | — | Compression molding, Pultrusion | SMC/BMC | Plasticity, colorable |
LC-3814 | High Impact PS | 3500-5500 | — | Compression molding, Pultrusion | SMC/BMC | High impact, colorable |
LC-3892 | Saturated Polyester | 150-230 | — | Compression molding, Pultrusion | SMC/BMC | High gloss, low viscosity, non-colorable |
LC-3817 | PVAc | 4200-4800 | — | Compression molding, Pultrusion | SMC/BMC | Low profile, high brightness, non-colorable |
LC-3870 | PMMA | 2500-3200 | — | Compression molding, Pultrusion | SMC/BMC | High gloss, weather resistance, water resistance |
Why Global Industry Leaders
Choose Lechi Composites
Quality Assurance
Every batch undergoes rigorous testing in our ISO-certified facilities to ensure consistent mechanical properties.
R&D Innovation
Our technical team continuously refines chemical formulations to meet evolving international standards.
Reliable Supply Chain
Global production capacity of 600,000 tons provides stability for your large-scale projects.
"Global Quality.
Professional Service."
Request Quote & Samples for Low Shrinkage Additives
Fill out the form below to receive a factory-direct quote and request free technical samples for your composite manufacturing.
Achieve Perfect Surface Finish
Work with our molding experts to optimize your LPA loading and cure cycle for zero-shrinkage, Class-A parts.