Hundreds Of Products Ready Today. Dispatch/Collection Complete Guide to Schroth Indi Seat Insert Kits and Fire Safety Standards
For drivers chasing the perfect seating position, Schroth Indi Seat Insert Kits remain one of the most effective solutions on the market. These kits allow you to mould a fully customised insert inside your existing FIA seat, giving you a precise fit that improves comfort, stability, and control. Whether you’re tackling endurance racing, sprint events, rally stages, or long days of testing, a properly fitted seat insert helps reduce fatigue and allows the driver to stay more focused behind the wheel.
Because the insert forms around your exact body shape, it eliminates unwanted movement that even high-end bucket seats can’t always prevent. That makes the Schroth Indi system especially valuable for drivers who share a car during an event or for racers who struggle to get comfortable using standard padding. Combined with full compliance to motorsport fire safety standards, the Indi kits offer a professional-level upgrade used widely across national and international racing categories. If you’re building a new motorsport seat setup or refining an existing one, this guide will walk you through everything you need to know about choosing the right kit, how they work, and why they are trusted by drivers across the world.
What Are Schroth Indi Seat Insert Kits?
Schroth Indiseat insert kits are bespoke seat molding systems that use a combination of tiny polystyrene beads and a special slow-cure resin to create a custom-fit racing seat insert. The process is straightforward: you position yourself in a liner (bag) filled with the micro beads, mix in the resin, then use a vacuum pump to suck out air while you sit in position. As the resin cures, it solidifies the beads into a rigid, form-fitted insert shaped exactly to your body. The result is a seat that fits you like a glove, improving comfort and support during high-G forces.
Schroth kits are available in four sizes:
- 30 Litre Kit
- 40 Litre Kit
- 50 Litre Kit
- 70 Litre Kit
Each kit includes two-part bead and resin bags that expand and mould around the driver when activated.
These inserts are race-proven, meaning they’ve been tested and used in serious motorsport environments. In fact, Schroth Indi inserts have been trusted in series like GP2, GP3, Formula 3, DTM, and even Le Mans prototypes. That’s a strong endorsement of their performance and safety. Racers choose Schroth Indi kits because they enhance the driver’s seating position and comfort while often reducing weight (more comfort + less weight = more speed!). Unlike generic foam padding, these resin-bead inserts hold their shape and provide consistent support season after season.
Key benefits of Schroth Indi insert kits:
- Custom Fit & Comfort: Molds to your body for a perfect fit, preventing you from sliding around in the seat. This boosts driver confidence and reduces fatigue on long stints.
- Safety & Support: Fills all the gaps between you and the seat shell, offering increased support to your hips, back, and shoulders. A snug insert helps in high-impact scenarios by distributing forces more evenly.
- Durability: The cured resin/bead structure is rigid and long-lasting. Many Schroth Indi inserts can last multiple seasons without degrading, unlike some foam cushions that can shrink or crumble over time.
- Adjustability in Setup: Because the resin cures slowly, you get ample working time (up to an hour) to try different seating positions before it sets. You can fine-tune your driving position, then lock it in by starting the cure.
- Complete Kit: Each Schroth Indi kit comes with everything needed, the bead-filled liner bag, pre-measured resin and hardener (in an easy mixing bottle), a black pigment (to ensure you can see when the resin is fully mixed with the beads), and even finishing materials like a fire-retardant fabric cover and spray adhesive for a professional result.
In short, Schroth Indi Poly-Bead kits let you DIY a pro-level seat insert that’s similar to what top racers use. It’s a worthwhile upgrade if you’re serious about driver comfort and maintaining proper posture behind the wheel.
Why Fire Retardancy Matters for Seat Inserts
In motorsport, safety is paramount. Fire risk is a reality in racing, and every piece of equipment in the cockpit must minimize that risk. This is why fire retardancy is such an important feature of Schroth INDI seat insert kits.
Imagine having a seat insert that isn’t fire-resistant, in the unfortunate event of a fire, that insert could ignite or melt, exposing the driver to toxic fumes or flames. Thankfully, Schroth INDI ensures their insert kits are designed to not contribute to a fire. The kit includes a fire-retardant liner cover made of brushed nylon fabric, along with a fire-safe spray adhesive for securing the cover. This cover material has been treated to resist ignition and slow the spread of flames.
But it’s not just about the cover. The resin and bead mixture itself is formulated for safety. Epoxy resins by nature are not easily flammable once cured, and Schroth INDI specific resin is engineered for motorsport use. All their racing seat inserts and materials meet the FIA’s stringent safety requirements. In other words, the completed insert (resin + beads + cover) conforms to the standards that the Fédération Internationale de l’Automobile (FIA) expects for racing vehicle interiors. So yes, the resin used in Schroth Indi Poly-Bead kits is fire-retardant, and the entire insert is built to FIA-compliant fire safety standards.
Fire Certification Standards Explained
Schroth Indi Insert kits meet FIA standards, which means the product satisfies relevant FIA regulations for flammability. In practice, this usually aligns with tests like ISO 3795 (the automotive interior horizontal burn test) or similar motorsport criteria. For example, materials used in top-tier racing must self-extinguish and not continue burning on their own. A comparable product in the industry, BSCI’s “EC 50” foam insert, was developed to meet higher FIA material standards (originally for headrest safety) and will not melt or drip in a fire, also being self-extinguishing. Schroth Indi poly-bead resin system is designed with the same philosophy: if exposed to flame, it should char and self-extinguish rather than fueling the fire.
The fire-retardant cover included with the kit is another layer of protection. It’s breathable and flame-resistant, similar to fabrics used in racing seat upholstery or driver suits. This cover ensures that the surface of your insert won’t easily ignite from sparks or heat in the cabin. By using the provided cover and adhesive, you maintain the fire safety of the insert. (So don’t skip covering the insert with the supplied material, it’s there for safety as well as comfort!)
Bottom line: Schroth Indi inserts are safe to use in competition. They have been used in many FIA-regulated series (from formula cars to endurance racers) with no issues, which speaks to their fire safety credibility. When you install a Schroth Indi seat insert, you’re not going to compromise the fire safety of your race car’s interior. It’s one less thing for scrutineers and you to worry about on race day.
Our Range of Schroth Indi Poly-Bead Kits (30L to 70L)
One of the great things about the Schroth Indi lineup is that they offer multiple kit sizes to suit different needs. At GSM Performance, we carry the full range of Schroth Indi Poly-Bead Resin Seat Insert Kits, four kits in total, ranging from 30 liters up to 70 liters. The “liter” measurement refers to the volume of beads (and thus roughly the size of the seat insert you can create). Choosing the right size depends on the type of seat or car you have.
Choosing the Right Schroth Indi Kit for Your Motorsport Needs
If you’re building a new racing setup or refining an existing one, choosing the correct Schroth Indi Insert Kit will significantly improve your driving comfort and performance. Consider the seat model you use, the level of support you require, and the cockpit environment.
No matter the size, all Schroth Indi kits share the same components and safety features. They all include the pre-measured resin/hardener, the bead bag, black mixing pigment, vacuum valve, instructions, and the fire-retardant cover + adhesive. The only difference is the volume of beads (and the corresponding amount of resin) provided. So you can pick the size that fits your application, and know you’re getting the same quality product trusted by pros.
If you’re unsure which size you need, feel free to reach out to us. With over 20 years of experience, we can help guide you. Often, the choice comes down to how much empty space is around you when you sit in your current seat. A good rule of thumb: it’s better to have a little extra kit than not enough. You can always remove some beads if you overshoot (the instructions include ratios for using less volume), but you can’t easily add more if you bought a kit too small.
How Do You Make an Indi Seat Insert?
- Step 1: Preparing the Seat: Line your bucket seat with the supplied protective film. This keeps the foam insert separate from the seat shell and ensures clean removal if you ever want to change the insert.
- Step 2: Mixing the Components: Activate the resin bags as instructed and distribute the contents evenly.
- Step 3: Creating the Mould: Place the activated material into the seat, sit inside, and allow it to shape around your body. Remain seated in your natural driving position until the material sets.
- Step 4: Final Adjustments: Once cured, remove excess material, trim the edges, and re-fit the insert inside the shell. The result is a perfectly contoured seating position tailored specifically for the driver.
For anyone who wants to see the Schroth Indi Seat Insert process carried out from start to finish, we recommend watching this detailed installation video.
The video takes you through every stage of creating a custom resin insert, from preparing the seat and activating the mixture to shaping the mould and trimming the final result. It clearly shows how the materials expand, how the driver should position themselves during curing, and what the finished insert looks like once properly fitted.
If you’re planning on making your own Indi seat insert for the first time, this walkthrough is a great visual guide and helps remove any uncertainty from the process. It shows just how straightforward the system is when you follow the steps correctly, making it easier to get a professional result at home or in the workshop.
Schroth Indi Kits vs. Traditional Foam Seat Inserts
While traditional expanding foam kits are still used by some drivers, Schroth Indi Poly-Bead Resin Kits offer a more reliable and safer alternative. Foam kits usually cure quickly, which can make it difficult to get your seating position just right. Schroth Indi kits give you up to an hour of working time, so you can fine-tune your position before the resin sets.
The finished insert from a Schroth Indi kit is lighter, more durable, and fire-retardant. Foam inserts can shrink or become brittle over time, whileSchroth Indi inserts hold their shape season after season. You also get a cleaner finish with the Schroth Indi system, using a fire-retardant fabric cover for extra protection. It’s the preferred choice for many professional teams because it offers better safety, better fit, and longer-lasting performance.
Final Thoughts – A Professional-Grade Upgrade for Any Motorsport Seat
Schroth Indi inserts provide a custom-fit solution that enhances comfort, stability, and safety inside any FIA-approved bucket seat. With full fire-retardant construction, multiple size options, and compatibility across all major motorsport seats, these kits offer a professional-grade upgrade for drivers at every level. Whether you’re competing in endurance racing or preparing for your first track day, a properly moulded insert can transform your driving experience and reduce fatigue on long sessions.