SF-529S Colored Para-aramid Filament Yarn | LOONG-FLEX®
Sinofibra Bulletin.

SF-529S Colored Para-aramid Continuous Filament Yarn is a dope-dyed continuous filament yarn designed for industrial color-coding and para-aramid reinforcement programs. Manufactured by Sinofibra under the LOONG-FLEX® brand, this product uses solution coloration to achieve stable shade control across the 600D to 1500D denier range.

The SF-529S series is engineered for manufacturing-side color coding in industrial workflows. By introducing pigment directly into the polymer solution during production, the coloration becomes an integral part of the fiber structure rather than a surface treatment. This approach reduces shade variation between batches and minimizes color migration in subsequent processing stages.

Technical Specifications

These specifications apply across the full denier range. The mechanical retention of tenacity and modulus remains stable whether selecting the 600D variant for fine yarn applications or the 1500D variant for heavy-duty reinforcement constructions.

Color Coding in Industrial Environments

Industrial color-coded yarn systems require consistent identification performance throughout the product lifecycle. The SF-529S supports process identification routes where color serves as a route marker, batch identifier, or specification code in manufacturing documentation. The dope-dyed coloration resists fading during normal handling, storage, and downstream processing, maintaining visual identification reliability.

Applications

The SF-529S Colored Para-aramid Continuous Filament Yarn serves three primary application categories:

1. Industrial color-coded yarn systems—where fiber color carries functional identification meaning in production environments
2. Process identification routes—workflow stages requiring traceable material marking
3. Para-aramid reinforcement programs—structural and protective textile constructions that benefit from both the mechanical performance of para-aramid and the visual differentiation provided by solution coloration

For procurement teams evaluating this product for reinforcement applications, the ≥19.0 cN/dtex tenacity and ≥85 GPa initial modulus confirm the mechanical performance baseline consistent with standard para-aramid continuous filament specifications.

Denier Selection Guidance

Selecting the appropriate denier depends on the target construction and processing method. Finer deniers such as 600D and 800D are typically used in compact yarn constructions, narrow fabrics, and applications where flexibility is prioritized. Heavier deniers including 1000D, 1200D, and 1500D are common in reinforcement fabrics, heavy-duty webbing, and constructions requiring higher absolute tensile load capacity.

The stable mechanical retention across the entire denier range means that choosing a specific variant should be based on end-use construction requirements rather than concerns about performance variability between deniers.

Technical Documentation

For complete engineering data, the SF-529S Colored Para-aramid Continuous Filament Yarn technical data sheet is available for download. This document contains detailed testing protocols, batch-to-batch variation ranges, and recommended storage conditions. Procurement specifications and supplier qualification documentation can be prepared using data extracted from the TDS.

To request samples or quotation for specific deniers within the SF-529S-600D to SF-529S-1500D range, contact the Sinofibra technical team with your target application, required quantity, and any specific testing or certification requirements for your supply chain qualification process.