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High-Performance Intumescent Hardware Protection
Interdens® is a phosphate-based intumescent sheet designed to enhance fire protection around critical areas of a certified fire door. It protects vulnerable hardware protection zones within the fire door assembly.
Manufactured by Wolman Wood & Fire protection (part of the Sika Group) and converted by Vanquish, this semi-rigid intumescent material activates at 150°C, expanding up to 95 times its original thickness to seal joints.
Key Product Features
Two-Phase Intumescent Expansion
Low activation temperature triggers a controlled, two-stage foaming process for enhanced fire protection performance.
Zero-Pressure Expansion Technology
Expands without pressure, filling crevices and weak points without distorting surrounding door hardware.
Designed for Ironmongery Protection
Ideal for hinges, locks, door closers and rebated ironmongery within timber fire door installation.
Flexible Thickness Options
Available in 0.6mm, 1mm and 2mm thickness to suit specification requirements.
Full Traceability Print
Vanquish hardware protection includes unique traceability print for compliance and fire safety assurance.
3rd Party Certified Performance
Independently accredited by IFC (International Fire Consultants Ltd) under the SDP20 intumescent protection kits scheme.
Interdens® Type 5 (0.6mm thickness) is a thin, semi-rigid intumescent sheet primarily used for ironmongery protection such as intumescent hinge pads and locks. Ideal for tight tolerances in fire door assembly and certified fire door applications up to 120 minutes.
Interdens® Type 15 (1.0mm thickness) provides enhanced intumescent protection where additional material depth is required. Suitable for door hardware, intumescent seal interfaces and fire door installations requiring 30, 60, 90 or 120-minute fire protection performance.
Interdens® Type 36 (2.0mm thickness) is designed for deeper grooves and structural applications within timber fire doors and frames. Offering substantial expansion and insulation, it delivers reliable hardware protection and fire safety performance in demanding specifications.
Frequently Asked Questions
Find the answers to the most frequently asked questions on Fire Protectors Monoammonium phosphate-based intumescent Interdens®.
Contact UsIntumescent hardware protection uses expanding intumescent material to seal gaps around door hardware during a fire, protecting weak points within the fire door assembly and maintaining fire protection integrity.
Interdens® is used within timber fire door installation to protect ironmongery including hinges, locks, door closers and other critical hardware protection areas.
Interdens® is available in 0.6mm, 1mm and 2mm thickness options to meet different fire door specification requirements and performance ratings.
Yes. Vanquish hardware protection products are accredited by IFC (International Fire Consultants Ltd) under the SDP20 scheme for intumescent protection kits and hardware protection.
The intumescent sheet activates at approximately 150°C, undergoing a two-phase foaming process and expanding up to 95 times its original volume to prevent fire and smoke spread.
Our Testimonials
For unparalleled fire protection, Vanquish is my absolute go-to. Their team's deep technical knowledge is matched only by the quality of their products — I'd...
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Vanquish is a reliable partner we know we can trust. On the rare occasion an issue arises, they resolve it quickly and keep us informed....
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Passive Fire Protection Distributor
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I have been dealing with Vanquish for many years now and have been using their products in combination with several essential hardware products being supplied...
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Hardware Manufacturer
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Vanquish have continually provided great advice, support and products for our business. From design, sampling and all the way to supply the whole team have...
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Hardware Manufacturer
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Working with Vanquish has been an extremely positive experience. Their products are exceptionally well designed and manufactured to a very high standard. Just as importantly,...
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Sealing Solutions & Distributor
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Vanquish has been a supplier to us for a few years now, consistently providing excellent service and reliable support through their knowledgeable team and customer-focused...
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Hardware Manufacturer
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Cannot fault the Vanquish team! From quick turnaround of enquiries and orders to pulling the odd rabbit out of a hat for us they always...
Read more
Passive Fire Protection Distributor
Via Other
Since their inception, our experience with Vanquish has been first class. From product innovation, customer service, training and value for money their approach to business...
Read more
Passive Fire Protection Distributor
Via Other
The team is professional, responsive, and consistently demonstrates a willingness to support us in achieving the best outcomes. Their innovative approach to intumescent products, combined...
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Hardware Manufacturer
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First time using Vanquish and I’m genuinely impressed with both the quality of the products and the excellent service that they provide.
Door Manufacturer
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For unparalleled fire protection, Vanquish is my absolute go-to. Their team’s deep technical knowledge is matched only by the quality of their products — I’d recommend their graphite as the best on the market. From initial contact to final delivery, their professionalism is second to none.
Hardware Manufacturer
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Vanquish is a reliable partner we know we can trust. On the rare occasion an issue arises, they resolve it quickly and keep us informed. It’s reassuring working with a supplier that doesn’t require constant checking up on.
Passive Fire Protection Distributor
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I have been dealing with Vanquish for many years now and have been using their products in combination with several essential hardware products being supplied into the industry for fire rated door sets. I would definitely recommend Vanquish to anyone looking for a good supplier of technically sound and competitive products.
Hardware Manufacturer
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Vanquish have continually provided great advice, support and products for our business. From design, sampling and all the way to supply the whole team have been extremely quick and efficient throughout. Highly recommended company and great team of dependable individuals
Hardware Manufacturer
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Working with Vanquish has been an extremely positive experience. Their products are exceptionally well designed and manufactured to a very high standard. Just as importantly, the team behind the business is knowledgeable, approachable, and always willing to provide support and practical solutions whenever required.
Sealing Solutions & Distributor
Via Other
Vanquish has been a supplier to us for a few years now, consistently providing excellent service and reliable support through their knowledgeable team and customer-focused approach, making dealing with them a very easy decision.
Hardware Manufacturer
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Cannot fault the Vanquish team! From quick turnaround of enquiries and orders to pulling the odd rabbit out of a hat for us they always put their customer’s satisfaction first and it is a pleasure to do business with them.
Passive Fire Protection Distributor
Via Other
Since their inception, our experience with Vanquish has been first class. From product innovation, customer service, training and value for money their approach to business brings a refreshing change.
Passive Fire Protection Distributor
Via Other
The team is professional, responsive, and consistently demonstrates a willingness to support us in achieving the best outcomes. Their innovative approach to intumescent products, combined with a genuine focus on collaboration and customer service, sets them apart.
Hardware Manufacturer
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First time using Vanquish and I’m genuinely impressed with both the quality of the products and the excellent service that they provide.
Door Manufacturer
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