Flame retardant For Fabric Coating

Zhejiang Xusen Flame Retardants Incorporated Company has concentrated on halogen-free flame retardants since 1997. Within our composite flame retardant range, the Flame retardants for other uses manufacturer group serves the substrates that sit outside the mainstream PA, PP and polyester moulding routes: silicone rubber, epoxy and unsaturated resin, polyurethane, adhesives and coated textiles. We supply these systems from two production bases with a combined annual capacity of 12,000 tonnes, and we build each grade around the resin chemistry, cure route and fire standard of the application rather than around one generic powder.

Where These Systems Fit

Composite flame retardants combine more than one active mechanism in a single product: an acid source that promotes charring, a carbon source, a gas-phase nitrogen donor, and in silicon-bearing grades a ceramic-forming component that reinforces the char against oxidation. That combination is what makes the range usable in thermosets, elastomers and coatings, where a single-substance additive often cannot reach the required rating without damaging cure behaviour, adhesion or flexibility.

• Thermoset resins — epoxy castings, laminates and potting compounds, plus unsaturated polyester and vinyl ester where char formation and low smoke matter.
• Polyurethane — rigid and flexible insulation, coatings and foam systems.
• Adhesives — acrylic, polyurethane and epoxy bonds that must meet flammability limits without losing tack or bond strength.
• Silicone rubber — cable, gaskets and seals requiring halogen-free fire performance with retained elasticity.
• Coated textiles — back-coating and fabric treatment for carpets, upholstery and technical textiles.

Product Range and Application Fit

The grades below are the composite systems we position for this group. Each one is matched to a substrate family and a process route, and the final selection is confirmed against the working point of your line.

Matching the System to the Cure Chemistry

Epoxy and unsaturated resin systems

Amine-cured epoxy is sensitive to acidic additives: an unmodified ammonium polyphosphate can react with the curing agent, shorten pot life and shift the glass transition. The XS-EP-7 series is offered for epoxy and unsaturated resin systems, and we select surface treatment and particle size so the flame retardant disperses into the resin without interfering with gel time or the cured network. For laminates and electrical castings we also look at how filler loading affects dielectric strength and tracking resistance, because those properties usually set the ceiling on how much can be added.

Polyurethane and adhesives

Polyurethane chemistry splits into one-shot and prepolymer routes, and the flame retardant has to suit whichever isocyanate and polyol combination is in use. XS-FR-C303 is our composite system for PU insulation materials and coatings. For adhesives, XS-FR-308 and XS-FR-708 are positioned for acrylic and polyurethane formulations where the additive must not plasticise the bond line or migrate to the surface over the service life of the joint.

Silicone rubber and coated textiles

Silicone rubber cures by peroxide or platinum addition, and platinum systems are poisoned by many conventional additives, so the grade is selected with the cure route in mind. XS-SI-6 is our composite flame retardant for silicone rubber. In fabric coating, XS-FR-C103 and XS-FR-C301 are used in back-coating and textile treatment, where the requirement is normally a defined add-on weight, a stable hand feel and durability through washing or abrasion.

Critical Specifications We Work To

Because these substrates are processed at different temperatures and shear rates, the specification set is agreed grade by grade. The parameters that decide whether a system works in production are:

• Phosphorus and nitrogen content, and the balance between acid source, carbon source and gas-phase donor.
• Decomposition onset and thermal stability window against the actual processing temperature.
• Particle size distribution (D50 and top cut) and residue on sieve, which govern dispersion quality and surface defects.
• Moisture content, water solubility and pH, which affect storage stability and compatibility with reactive systems.
• Bulk density and flow behaviour for feeding accuracy on the line.
• Effect on viscosity, pot life, gel time and cure exotherm.
• Retention of tensile strength, elongation, impact and adhesion at the working loading.
• Smoke density, toxicity and halogen content where the end application is regulated.

Processing, Dispersion and Line Integration

Dispersion is the largest single variable in thermoset, elastomer and coating applications. A poorly wetted powder leaves agglomerates that show up as surface defects, weak points in a casting or inconsistent fire performance across a batch, so we agree the addition point, mixing sequence and shear level with the customer before a grade is fixed.

We confirm the feed form during configuration: powder grades for direct addition into resin or binder under shear, and where a line cannot handle powder, we review the masterbatch route from our wider range. Addition levels are set from the target rating, the loading ceiling of the formulation and the property retention limits, and we support the first production trials with starting-point dosages and sample quantities for laboratory work.

Capacity, Consistency and Quality Assurance

Two production bases in Jiashan, Zhejiang and Juancheng, Shandong give us a combined annual capacity of 12,000 tonnes, with room to expand. Production and quality inspection equipment sit in our own workshops and warehouses, and every step of product formation follows the ISO 9001-2015 quality management system.

Our Zhejiang provincial-level scientific research laboratory and the joint laboratory established with the Shanghai Institute of Chemistry support development work. We also work with Beijing Technology and Business University, Shandong Haihuai Institute and Shandong Brothers through China's advanced light industry flame retardant engineering technology research centre. Batch-to-batch consistency is controlled through incoming raw material checks, in-process controls and finished-product testing, with retained samples for traceability.

Compliance Evidence and Documentation

Our products comply with WEEE, RoHS and EUP requirements, and REACH registration applies across the MCA and APP ranges. RoHS test reports are available for APP, ATH, flame retardant for PA and flame retardant for polyolefin, together with halogen test reports and RoHS 3.0 reports for MCA. For a project we issue the technical data sheet, safety data sheet, batch certificate of analysis and the compliance documentation relevant to the grade and the destination market.

Customization, Packaging and Delivery Scope

Custom development is part of the range. We adjust surface treatment, particle size, active content and carrier to suit a specific resin, cure system or coating line, and we can develop a grade for a substrate that is not covered by a standard series. Packaging, labelling and delivery scope are agreed per order, including pack size, pallet configuration and the documentation set required for the destination.

The wider Composite flame retardants range covers the PA, PP and polyester routes, and single-substance options such as MCA, APP, organophosphorus and ATH are available where a formulation calls for a different balance of mechanisms.

Information We Use to Configure Your Solution

A configuration and quotation are prepared from the working point of the application, not from a catalogue number alone. The following inputs let us select the series, set the loading and confirm the feed form:

• Substrate and full formulation: resin or polymer type, grade, filler and plasticiser content.
• Cure or crosslinking system: amine, anhydride, peroxide, platinum addition, isocyanate index or catalyst.
• Processing window: mix temperature, shear, residence time, addition point, pot life and gel time limits.
• Target fire performance: standard, test method, rating and the loading ceiling the formulation can accept.
• Property constraints: mechanical, electrical, optical, hand feel, adhesion and flexibility.
• Smoke, toxicity and halogen limits applicable to the end product.
• Feed form and line constraints: powder handling, dust control, dosing accuracy, liquid addition.
• Annual volume, first order quantity and sample quantity for trials.
• Packaging, labelling, documentation and delivery destination.

Frequently Asked Questions

Which substrates does this range cover?

Silicone rubber, epoxy and unsaturated resin, polyurethane insulation and coatings, acrylic and polyurethane adhesives, and coated textiles including carpets and technical fabrics. The grades are XS-SI-6, the XS-EP-7 series, XS-FR-C103, XS-FR-C301, XS-FR-C303 and XS-FR-308 / XS-FR-708.

Can you develop a grade for a resin that is not in the standard series?

Yes. Custom development is part of our work, and we adjust surface treatment, particle size, active content and carrier to match a specific resin, cure system or coating line. We start from the formulation and the target rating, then confirm the grade through sample trials before production supply.

What loading do you recommend?

Loading is set by the target standard, the property retention limits of the formulation and the processing window. We provide a starting-point dosage with the sample and adjust it against your test results, because the same flame retardant behaves differently in an amine-cured epoxy, a platinum-cure silicone and a PU foam.

Do the products contain halogens?

The range is halogen-free. Our products comply with WEEE, RoHS and EUP requirements, and halogen test reports are available for the relevant grades.

What documentation accompanies a shipment?

We issue the technical data sheet, safety data sheet and batch certificate of analysis, together with the RoHS, REACH and halogen documentation applicable to the grade. Packaging and labelling are agreed per order so the delivery matches the receiving requirements of the destination.

How do you handle dispersion problems in epoxy or coating systems?

We agree the addition point, mixing sequence and shear level with the customer, and select particle size distribution and surface treatment to suit the viscosity of the system. Where a line cannot handle powder, we review the masterbatch route from our wider range during configuration.