The HGYY-TW712 is a halogen-free, graphite-based flexible intumescent strip engineered for use inside passive fire protection collar systems, including UL1479 listed assemblies. It generates high expansion pressure and volume when heated above 180°C, sealing combustible pipe penetrations through floors and walls before fire can travel through the assembly.
Supplied in continuous rolls. Available for OEM fire collar manufacturers and firestop system integrators worldwide.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | HGYY-TW712 |
| HS Code | 3920999090 |
| Base Material | Halogen-free expandable graphite compound |
| Density | 1,250 kg/m³ |
| Free Expansion Ratio | 20x (tested at 550°C, 30 min, 5mm thickness sample) |
| Activation Temperature | 180°C (356°F) |
| Halogen Content | None — halogen-free formulation |
| Heavy Metals | None |
| Aluminum Foil Coating | Available on request |
| Dimension Parameter | Range |
|---|---|
| Thickness | 2–8 mm |
| Max Roll Length | 10,000 mm per roll |
| Custom Dimensions | Available — contact for specifications |
Why Fire Collar Manufacturers Specify HGYY-TW712
Designed and tested for UL1479 collar systems HGYY-TW712 is the intumescent component used in FireEG’s own UL1479-listed FEG40 Collar assembly (Certificate No. R40652, System No. C-AJ-2941). OEM customers supplying to projects requiring UL1479 documentation can request full compliance traceability for this strip as part of the collar system.
Continuous roll supply for production efficiency Available in rolls up to 10,000mm, reducing splice joints in collar assembly and ensuring consistent material properties across each batch. Suitable for automated winding and cutting processes.
High expansion pressure under mechanical confinement When enclosed inside a steel collar shell and heated, the HGYY-TW712 generates directed expansion pressure — compressing the melting plastic pipe and sealing the penetration opening. Free expansion ratio of 20x (at 550°C, 30 min) ensures full closure across all certified pipe sizes.
Halogen-free — no toxic gas generation Unlike intumescent materials containing halogens, the HGYY-TW712 releases no hydrogen chloride (HCl) or hydrogen bromide (HBr) during activation — important for occupied buildings, tunnels, and projects requiring LSZH compliance.
Compatible Applications
Competitor Context — How HGYY-TW712 Compares
Most graphite-based intumescent strips available from European and North American suppliers are manufactured using Chinese expandable graphite as the base material. FireEG manufactures the finished strip directly at source in Hebei, China — eliminating the intermediary processing markup while maintaining the same graphite raw material quality. Key specification comparison:
| Parameter | HGYY-TW712 (FireEG) | Typical market range |
|---|---|---|
| Expansion ratio (550°C, 30min) | 20x | 10–20x |
| Activation temperature | 180°C | 150–200°C |
| Halogen content | None | Varies by brand |
| UL1479 system documentation | Available (C-AJ-2941) | Varies |
| Supply form | Continuous rolls | Cut pieces or rolls |
| MOQ flexibility | Yes — OEM quantities | Often high MOQ |
Frequently Asked Questions
Q: Is the HGYY-TW712 tested as part of a UL1479 system?
Yes. It is the intumescent component within FireEG’s UL1479-listed FEG40 Collar system (Certificate No. R40652, System C-AJ-2941, issued August 30, 2023). Documentation available on request.
Q: What is the difference between HGYY-TW712 and HGYZ-AW715?
HGYY-TW712 is specifically formulated and dimensioned for use inside fire collar assemblies — optimized for expansion under radial confinement. HGYZ-AW715 is a general-purpose flexible strip for broader firestop and duct sealing applications.
Q: Can you supply pre-cut strips for specific collar dimensions?
Yes. Please provide the collar shell inner circumference and required strip thickness and width. We supply pre-cut strips for high-volume collar assembly lines.
Q: What is the minimum order quantity?
MOQ varies by thickness and width specification. Please submit an enquiry with your required dimensions and annual volume estimate for a quotation.
Q: Is an aluminum foil-coated version available?
Yes, aluminum foil coating is available on request for applications requiring additional moisture barrier or handling durability.
Q: What pipe materials and sizes is this strip certified for?
When used in the FEG40 Collar system per UL1479 System C-AJ-2941: PVC (up to 4″), CPVC (up to 4″), ABS (up to 4″), FRPP (up to 2″). Refer to the system document for complete substrate and installation requirements.
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