Fire Retardant Thread Explained: Types, Uses, and How to Choose for Machine Embroidery

1. Introduction to Fire Retardant Thread Essentials

In the world of machine embroidery and protective apparel, fire retardant thread is more than just a specialty material—it's a lifeline. Whether you're crafting uniforms for firefighters, outfitting motorsports teams, or adding logos to industrial workwear, the right thread can mean the difference between safety and disaster. This guide unpacks the essentials of fire retardant thread: what it is, why it matters, and how it underpins safety in high-risk environments. We’ll explore the science behind its heat resistance, delve into industry applications, break down purchasing considerations, and provide practical tips for machine embroidery. Ready to discover how this remarkable thread can elevate both your safety standards and your embroidery projects? Let’s dive in.

Table of Contents

• 1. Introduction to Fire Retardant Thread Essentials
• 2. Defining Fire Retardant Thread: Materials and Core Properties
• 3. Purchasing Guide: Types, Specs, and Top Brands
• 4. Machine Embroidery Techniques and Home Machine Setup
• 5. Safety Standards and Compliance Testing
• 6. Industrial Applications Across Key Sectors
• 7. Maintenance and Long-Term Care Protocols
• 8. Conclusion: Implementing Best Practices
• 9. FAQ: Fire Retardant Thread Essentials

2. Defining Fire Retardant Thread: Materials and Core Properties

Fire retardant thread stands at the intersection of advanced material science and life-saving practicality. Unlike standard sewing threads, these specialized fibers are engineered to resist extreme heat, self-extinguish when exposed to flame, and maintain their integrity under punishing conditions. Let’s unravel what makes fire retardant thread the unsung hero of safety textiles.

2.1 Aramid Fiber Technologies: Nomex and Kevlar Explained

When it comes to fire retardant threads, two names dominate the conversation: Nomex and Kevlar. Both belong to the aramid fiber family, but each brings unique strengths to the table.

Meta-Aramid (Nomex): Developed by DuPont, Nomex is renowned for its exceptional resistance to heat, chemicals, and abrasion. It can withstand continuous temperatures up to 200°C (392°F) and peak exposures of 300°C (572°F). Nomex threads don’t melt or drip; instead, they self-extinguish when the flame source is removed. For example, products like Coats Firefly, spun from 100% meta-aramid, maintain their structure up to a melting point of 371°C (700°F). This self-extinguishing behavior is a crucial safety feature, preventing flames from spreading along seams or embroidery.

Para-Aramid (Kevlar): Kevlar, also by DuPont, is famous for its incredible tensile strength—about 2.5 times that of nylon or polyester. It resists temperatures up to 427°C (800°F) and, notably, has no defined melting point. Instead, it decomposes at high heat, forming a protective char layer that halts combustion. This makes Kevlar threads ideal for applications demanding both fire resistance and mechanical durability, like body armor or heavy-duty protective gear.

How Do They Compare to Ordinary Materials? Let’s put things in perspective:

The Science Behind Self-Extinguishing Threads: The magic lies in the molecular structure of aramid fibers. When exposed to flame, they decompose in a controlled way, forming a charred barrier that prevents further burning. Unlike conventional threads, there’s no melting, dripping, or fuel for flames to travel.

Industrial Applications: You’ll find these threads wherever safety is paramount—firefighter uniforms, industrial gloves, motorsports suits, aerospace components, and, increasingly, in machine embroidery for safety apparel. Their unique blend of heat resistance and mechanical strength makes them indispensable.

2.2 Fire Retardant vs. Fire Resistant: Critical Differences

Here’s a trivia question: Is “fire retardant” the same as “fire resistant”? The answer could save your project—and maybe a life.

Fire Retardant Threads: These are typically standard synthetic fibers (like polyester) that have been chemically treated to slow down burning. The treatment, often phosphorus-based and non-halogen, is added during manufacturing. While effective, the flame-retardant properties can diminish over time, especially after repeated washing or exposure to harsh environments. Treated threads may still melt, warp, or drip under high heat—even if they self-extinguish when the flame is removed.

Fire Resistant Threads: Inherently fire resistant threads, such as those made from Nomex or Kevlar, possess flame resistance as part of their molecular structure. They do not rely on surface treatments, so their protective qualities remain consistent throughout their lifespan—even after laundering or heavy use. These threads do not melt or drip and are designed to self-extinguish, offering a higher level of safety and reliability.

Why Does This Matter?

• Long-Term Performance: Inherently fire resistant threads (Nomex, Kevlar) maintain their properties for the life of the garment, while chemically treated threads may lose effectiveness over time.
• Application Suitability: For critical safety gear—think firefighting, military, motorsports, or industrial uniforms—standards often require the use of inherently fire resistant threads to ensure compliance and maximum protection.
• Safety Standards: Regulatory frameworks (NFPA, EN ISO, ASTM) often specify which type of thread is acceptable for certified protective apparel. Using the wrong type could mean failing inspection—or worse, putting users at risk.

In Summary:

• Fire retardant = chemically treated, may degrade, can melt/drip.
• Fire resistant = inherently non-flammable, self-extinguishing, does not melt/drip.

Choose wisely based on your application’s demands and the relevant safety standards.

3. Purchasing Guide: Types, Specs, and Top Brands

Selecting the right fire retardant thread isn’t just about grabbing the first spool you see—it’s about matching technical specs, color options, and trusted brands to your project’s needs. Here’s how to navigate the marketplace with confidence.

3.1 Technical Specifications: Tex Sizing and Color Options

Tex Measurement System:
The Tex system is the gold standard for thread sizing. It’s simple: if 1,000 meters of thread weighs one gram, it’s Tex 1. The higher the Tex number, the thicker and stronger the thread.

Note: Tex 70 is the thickest size most home sewing machines can handle.

Color Options:
Here’s where fire retardant threads differ from their everyday cousins. Because aramid fibers are tough to dye, color choices are more limited—think natural off-white, black, red, yellow, and a handful of other shades. For example, Nomex thread is available in colors like orange, red, yellow, copper, black, white, pink, blue, tan, camo green, sage green, forest green, kelly green, and gray/silver. European suppliers, such as Madeira, offer up to 30 resistant colors in their Fire Fighter range, but the palette remains more restrained than with polyester or rayon threads.

Why Limited Colors?
The dyeing process for aramid fibers is complex and costly, which means fewer options and higher prices. If your design demands vibrant hues, double-check availability before committing.

Other Key Specs:

• Construction: Spun threads offer flexibility; multifilament threads provide greater strength.
• Elongation: Fire retardant embroidery threads typically have 32–35% elongation, ideal for intricate designs.
• Packaging: Available in trial lengths, 5,000-meter cones, or 6,000-yard spools—choose based on your production scale.

3.2 Leading Brands and Cost-Effective Solutions

Top Brands in the Market:

• Rocket-Fibers: Specializes in 100% Nomex threads, Berry Amendment compliant, with a wide range of Tex sizes and custom options.
• A&E (American & Efird): Offers Tex 40 fire retardant threads on large spools, designed for heavy-duty industrial use.
• Madeira USA: Their Fire Fighter line is made from 100% aramid (Nomex) and Oeko-Tex certified, perfect for embroidery applications and available in up to 30 colors.
• John Howard Company: Focuses on military-spec threads with twisted multifilament construction for extra strength.
• Gunold USA: PolyFire flame retardant thread, 40 weight, compatible with standard embroidery designs and available in 27 colors.

Bulk Purchasing & Budget Tips:

• Buy Larger Spools: Full factory cones or 6,000-yard spools offer better value for high-volume users.
• Trial Lengths: For testing or small projects, trial packs are available.
• Custom Orders: Many suppliers offer custom dyeing or sizing for specialized needs—just be prepared for longer lead times and higher costs.
• Online Retailers: Specialty thread shops and direct manufacturer sales for embroidery machines on sale are your best bet for detailed specs and technical support.

Pricing Snapshot:
Expect to pay a premium for fire retardant threads—Tex 40, for example, typically retails between $76 and $95 for a 6,000-yard spool. While this is higher than standard polyester, the safety and compliance benefits are well worth the investment for critical applications.

Regulatory Compliance:
For government or military contracts, ensure Berry Amendment compliance (domestic sourcing) and check for certifications like EN ISO 15025 or Oeko-Tex for international markets.

In Summary:
Choosing fire retardant thread is about balancing technical requirements, color needs, and budget. Stick with trusted brands, verify specs, and don’t cut corners when safety is on the line.

4. Machine Embroidery Techniques and Home Machine Setup

Fire retardant thread isn’t just for industrial giants—today’s machine embroidery enthusiasts and small studios can harness its protective power right at home. But before you thread that needle, let’s break down the practical steps and settings that ensure both safety and stitch perfection.

4.1 Compatibility and Settings for Optimal Results

Needle Selection:

Choosing the right needle is your first defense against thread breakage and machine headaches. For most fire retardant embroidery threads—whether Nomex, Kevlar, or specialized brands like Gunold PolyFire—a #75/11 or #80/12 needle is recommended. These sizes offer the ideal eye diameter to accommodate the slightly fuzzy, spun texture of aramid threads without causing excess friction or fraying. Universal needles work well for most projects, but if you’re embroidering on synthetics, a ballpoint needle can help prevent fabric snags.

Thread Weight and Machine Compatibility:

Home embroidery machines are typically compatible with threads up to Tex 70. Most fire retardant threads for embroidery fall within this range, but always double-check your machine’s specs. Threads like Gunold PolyFire (40 weight) are designed to run smoothly on standard home and commercial embroidery equipment.

Tension Adjustments:

Aramid-based threads behave differently than polyester or cotton. Their slightly stiffer, less elastic nature means you may need to reduce upper and bobbin thread tension to prevent breakage or uneven stitches. Always test on scrap material first, making incremental adjustments until the stitches lay flat and the thread moves freely.

Bobbin Threading:

For true flame resistance, your bobbin thread should match the fire retardant properties of your top thread. Using standard polyester or cotton bobbin thread can create weak points in your embroidery—heat may cause these sections to fail even if the top thread holds strong. Brands like Madeira offer aramid bobbin threads in black and white, ensuring consistent protection throughout the design.

Backing and Stabilizer Compatibility:

Your project is only as flame-resistant as its weakest link. Always pair fire retardant thread with flame-resistant backings—such as aramid fiber stabilizers like E-ZEE Fire Fighter. These backings come in convenient pre-cut sizes and rolls, and they’re engineered to maintain the garment’s overall flame resistance. Standard embroidery backings should be avoided in any safety-critical application.

Fabric Selection:

Using fire retardant thread on non-flame-resistant fabric is like putting a fireproof lock on a cardboard door. For genuine protection, ensure your base fabric is also rated for flame resistance. Only then will your embroidery meet safety standards and deliver the intended level of protection.

Threading Tips:

Fire retardant threads often have a cotton-like, matte finish and can be a bit “fuzzy.” Take your time threading the machine, and consider using a thread net or guide if your machine has one. This helps prevent snags and ensures smooth delivery through the tension discs and needle.

Test, Test, Test:

Before launching into your final project, run a test embroidery on scrap flame-resistant fabric with matching backing. Observe the stitch quality, check for breakage, and confirm that the embroidery maintains its integrity after a quick flame test (if appropriate and safe to do so).

Pro Tip:

If you’re working with Gunold PolyFire or Madeira Fire Fighter threads, both brands recommend using their own flame-resistant bobbins and backings for best results. This ensures the entire embroidery assembly passes flame resistance tests and meets industry standards.

4.2 Step-by-Step Project Execution for Beginners

Ready to put your fire retardant thread to work? Here’s a beginner-friendly roadmap to flawless, safety-compliant embroidery.

1. Gather Your Materials

• Flame-resistant fabric (e.g., Nomex, treated cotton)
• Fire retardant embroidery thread (e.g., Nomex, Kevlar, PolyFire)
• Flame-resistant bobbin thread
• Flame-resistant backing/stabilizer
• #75/11 or #80/12 needle
• Compatible embroidery machine (home or commercial)
• [Optional] MaggieFrame magnetic embroidery hoop for garment embroidery

2. Hooping Techniques

Proper hooping is the secret sauce for stable, distortion-free embroidery—especially with safety-critical threads. For garment embroidery, MaggieFrame magnetic embroidery hoops offer a major upgrade over traditional screw hoops. Their strong magnetic force automatically adapts to various fabric thicknesses, providing even tension and preventing fabric slippage or hoop burn. This is especially valuable when working with thick, multi-layered, or delicate flame-resistant fabrics.

3. Backing Placement

Cut your flame-resistant backing to fit the hoop area. Place it behind your fabric, ensuring full coverage of the embroidery zone. The right backing not only supports the stitches but also preserves the garment’s flame resistance.

4. Threading and Bobbin Prep

Thread your machine with fire retardant thread on top and flame-resistant bobbin thread below. Double-check that both are feeding smoothly and that tension is properly adjusted.

5. Stitch Density and Design Settings

For fire retardant thread, a 4.0 average stitch density is generally recommended. This ensures robust coverage without over-stressing the thread or fabric. Avoid overly dense designs, which can cause thread breaks or puckering—especially on aramid-based threads.

6. Test Stitch and Adjust

Always run a test design on scrap material. Watch for any thread fraying, breakage, or skipped stitches. Adjust tension and needle size if needed. If you notice persistent issues, try slowing down the machine speed slightly or switching to a new needle.

7. Embroider the Final Project

Once satisfied with your test, hoop the actual garment using your MaggieFrame magnetic hoop for optimal stability. Embroider your design, keeping an eye on thread performance throughout.

8. Finishing and Inspection

After embroidery, carefully remove the hoop and inspect the stitches. Check that the embroidery is secure, the fabric hasn’t distorted, and there are no weak spots. If the project is for certified protective wear, conduct a flame resistance test according to the relevant standard (e.g., ISO 15025).

Troubleshooting Common Issues:

• Thread Breakage: Lower tension, use a new needle, or slow machine speed.
• Skipped Stitches: Ensure needle size matches thread weight and fabric type.
• Fabric Puckering: Use proper backing and ensure even hoop tension—MaggieFrame hoops can help here.

Why MaggieFrame Magnetic Hoops?

For garment embroidery, especially with thick or tricky flame-resistant fabrics, MaggieFrame magnetic hoops provide a fast, secure, and user-friendly solution. Their even tension and easy operation minimize the risk of fabric movement, ensuring your safety embroidery looks sharp and stands up to real-world wear.

5. Safety Standards and Compliance Testing

When it comes to fire retardant thread, “close enough” just doesn’t cut it. In industries where lives are on the line—firefighting, motorsports, industrial workwear—thread performance must be proven, not assumed. That’s where rigorous safety standards and testing protocols come in.

NFPA Standards: The North American Gold Standard

The National Fire Protection Association (NFPA) sets the bar for flame-resistant textiles. For fire retardant thread, two standards stand out:

• NFPA 2112:Governs flame-resistant garments for industrial personnel. Threads must withstand flash fire and electric arc exposure, with strict limits on char length (≤4.0 inches during testing) and after-flame time. Testing includes ASTM D7138 (thread melting resistance), ASTM D6413 (vertical flame resistance), ASTM F2894 (heat resistance), and ASTM F1930 (instrumented manikin test).
• NFPA 1971:Focuses on firefighter protective gear. Threads must not melt, drip, or propagate flame, and must self-extinguish when the heat source is removed. This standard is non-negotiable for turnout gear and similar high-risk applications.
• NFPA 70E:Addresses electrical worker protection, referencing ASTM F1506 for flame and arc resistance. Here, the vertical flame test (ASTM D6413) is key, with a maximum after-flame time of 2.0 seconds and a char length limit of 6.0 inches.

International and European Standards

• EN ISO 15025:A widely recognized European standard for flame propagation testing. Threads and finished embroidery must pass this test to be certified for use in protective workwear and uniforms.
• Other Relevant Standards:
  • EN 469, EN ISO 11611, EN ISO 11612, EN ISO 14116: Cover various aspects of industrial and emergency service protective clothing.
  • ASTM E84: Measures surface burning characteristics, often relevant for interior textile applications.
  • NFPA 701: Applies to flame propagation in textiles and films, important for commercial drapery and similar uses.

Testing Methodologies

• Vertical Flame Test (ASTM D6413):Measures how a thread or fabric reacts to a direct flame. The key metrics: char length, after-flame time, and whether the material melts or drips.
• Heat Transfer and Manikin Testing (ASTM F2700, F1930):Simulate real-world conditions, measuring how well a garment (including thread and embroidery) protects against heat and flame.
• Thread Melting Resistance (ASTM D7138):Ensures thread integrity under high heat—critical for seams and embroidery on protective gear.

Certification Process

Most industries require third-party certification. Manufacturers provide certificates of fire retardancy for compliant threads, and finished garments must be tested as a complete system—fabric, thread, backing, and embroidery—before being approved for use.

Performance Benchmarks

• Temperature Resistance:Threads must withstand up to 700°F (366°C) for short-term exposure, with some aramid threads enduring even higher temps before decomposing.
• Char Length and After-Flame:NFPA 2112: ≤4.0 inches char length.ASTM F1506: ≤6.0 inches char length, ≤2.0 seconds after-flame.

Why Does This Matter?

Cutting corners on thread selection or skipping certification can mean the difference between a garment that protects—and one that fails when it matters most. Always verify that your fire retardant thread meets the standards required for your application, and insist on documentation from suppliers.

6. Industrial Applications Across Key Sectors

Fire retardant thread isn’t just a specialty product for industrial embroidery machines—it’s the backbone of safety across industries where heat, flame, and risk are part of the daily grind. Let’s explore where and how these threads make a life-saving difference.

6.1 Protective Clothing and Military Gear Manufacturing

Firefighter Gear: Fire retardant threads are indispensable in the construction of turnout gear, gloves, and hoods for firefighters. These threads—often made from Nomex or Kevlar—ensure that every seam, patch, and embroidered insignia maintains flame resistance, even under intense heat. Compliance with NFPA 1971 is mandatory, meaning threads must not melt, drip, or propagate flame.

Military Uniforms and Equipment: The U.S. military sets strict standards for fire retardant sewing threads, with specifications such as A-A-50195, A-A-55195, A-A-55217, and A-A-55220—all requiring Nomex or Kevlar fibers. These threads are used in uniforms, flight suits, and specialized gear, providing protection against flash fires, explosions, and electrical arcs. The Natick Soldier Research, Development and Engineering Center (NSRDEC) continues to innovate in this area, seeking threads with high strength, elasticity, and UV resistance.

Electrical Arc Protection: Utility workers, linemen, and others exposed to electrical hazards rely on flame-resistant uniforms stitched with compliant threads. Here, the thread’s ability to withstand arc flash and maintain seam integrity under extreme conditions is critical.

Berry Amendment Compliance: For U.S. military contracts, all fire retardant threads must be domestically sourced and meet Berry Amendment requirements—ensuring both performance and supply chain reliability.

Material Specifications: Threads must balance fire resistance, strength, and sewability. Meta-aramid (Nomex) and para-aramid (Kevlar) threads dominate due to their high decomposition temperatures, self-extinguishing behavior, and resistance to chemicals and abrasion.

6.2 Machine Embroidery for Safety Apparel

Uniform Embroidery Techniques: Adding logos, names, or insignia to protective apparel isn’t just about branding—it’s about maintaining the garment’s safety rating. Embroidery must use fire retardant threads, flame-resistant bobbins, and compatible backings to ensure the finished product passes certification tests like ISO 15025.

Tension Consistency: Achieving uniform tension is vital for both appearance and safety. Inconsistent tension can lead to thread breaks, loose stitches, or puckering—all of which compromise the garment’s protective function.

Efficiency Tools: MaggieFrame Magnetic Hoops

For garment embroidery, especially on flame-resistant fabrics, MaggieFrame magnetic embroidery hoops offer a significant advantage. Their powerful magnetic system automatically adapts to varying fabric thicknesses, providing even tension and preventing slippage. This not only speeds up production but also ensures that every stitch is secure—an absolute must for safety-critical apparel.

• Why MaggieFrame?
• Even Tension: Reduces risk of hoop burn and fabric distortion.
• Quick Setup: Saves valuable production time, especially in large-scale uniform manufacturing.
• Durability: Withstands the rigors of repetitive, high-volume embroidery on tough, flame-resistant fabrics.

Industrial Embroidery Applications: From firefighter uniforms to motorsports suits and industrial workwear, machine embroidery with fire retardant thread is now standard practice. The right combination of thread, backing, and hooping technology ensures that safety apparel not only looks professional but also performs under pressure.

Final Word: In the world of safety apparel, every detail counts. By integrating certified fire retardant threads, flame-resistant backings, and advanced tools like MaggieFrame magnetic hoops, manufacturers can deliver uniforms and gear that meet the highest standards—protecting workers, first responders, and military personnel when it matters most.

7. Maintenance and Long-Term Care Protocols

Caring for garments made with fire retardant thread isn’t just about keeping them clean—it’s about preserving the very properties that keep you safe. Whether you’re outfitting firefighters, industrial workers, or simply want your embroidery to stand the test of time, proper maintenance is non-negotiable. Let’s break down the essentials for washing, drying, and long-term preservation of flame-resistant apparel.

Pre-Washing Inspection and Preparation

Before tossing your garment in the wash, take a moment for a thorough inspection. Remove detachable accessories, close all fasteners, and check care labels—different fabrics and threads may have unique laundering needs. If you’re working with new Nomex garments, consider a motion comfort test before the first wash, as minimal shrinkage can occur.

Washing Guidelines

• Temperature Matters: Wash fire retardant garments in cold or warm water, never exceeding 60°C (140°F). Excessive heat can compromise flame resistance and cause unwanted shrinkage.
• Cycle Selection: Use a normal or cotton cycle, and avoid overloading the washer. Turn garments inside out to minimize abrasion and help colors last.
• Detergent Choices: Stick to mild, standard home detergents. Avoid soaps with animal fats and never use chlorine bleach, as it can destroy flame-resistant polymers and fade colors. Fabric softeners, starch, and dryer sheets are strictly off-limits—they coat fibers, mask flame resistance, and can even become fuel in a fire.
• Water Quality: Soft or conditioned water is best. Hard water can cause mineral buildup, which over time may reduce the garment’s protective qualities.

Drying and Heat Management

• Air Drying: Whenever possible, air-dry garments in a well-ventilated area, away from direct sunlight and high-heat sources.
• Machine Drying: If you must use a dryer, select a low heat setting. Over-drying can cause excessive shrinkage and damage.
• Professional Laundering: Industrial laundering services can be a smart choice for heavily soiled or contaminated garments, offering precise temperature and detergent control.

Long-Term Preservation

• Regular Cleaning: Don’t wait for visible dirt—regular laundering removes flammable contaminants and maintains the garment’s protective function.
• Repairs: Only use flame-resistant thread and fabric for repairs. Minor issues can be fixed with darning or patching using like materials.
• Inspection: Routinely check for tears, excessive wear, or contamination that could compromise safety. Remove garments from service if structural integrity is lost.

Testing Flame Resistance Over Time

After repeated washing, it’s wise to periodically test for flame resistance—especially for garments in critical applications. Follow manufacturer recommendations and, when in doubt, consult professional laundering services familiar with ASTM and ISO standards.

By following these protocols, you’ll ensure your fire retardant embroidered garments remain reliable protectors—wash after wash, year after year.

8. Conclusion: Implementing Best Practices

Choosing and caring for fire retardant thread isn’t just a technical detail—it’s a commitment to safety, compliance, and quality. Select threads that match your fabric’s flame resistance, always use compatible backings and bobbins, and follow strict maintenance routines. Adhering to these best practices ensures your machine embroidery not only looks sharp but also stands up to the toughest environments. Remember: the right materials and care protocols are your first line of defense in any high-risk setting.

9. FAQ: Fire Retardant Thread Essentials

9.1 Q: Can I use fire retardant thread with my home sewing machine?

A: Yes, most home sewing machines can handle fire retardant threads up to Tex 70. Always check your machine’s specifications and use the recommended needle size (typically #75/11 to #100/16) for optimal results.

9.2 Q: How often should I wash garments made with fire retardant thread?

A: Regular washing is recommended to remove contaminants that could compromise flame resistance. Follow care labels and avoid harsh chemicals—use mild detergents and wash at temperatures not exceeding 60°C (140°F).

9.3 Q: Will the color of fire retardant thread fade with washing?

A: Fire retardant threads, especially those made from aramid fibers like Nomex and Kevlar, offer good color retention when washed according to guidelines. Avoid bleach and fabric softeners to preserve color and flame resistance.

9.4 Q: How can I verify that my fire retardant thread meets industry certifications?

A: Reputable brands provide documentation and certificates for standards such as NFPA 2112, EN ISO 15025, and ASTM. Always request certification from your supplier, especially for safety-critical applications.

9.5 Q: What should I do if a garment made with fire retardant thread needs repair?

A: Only use flame-resistant thread and fabric for repairs to maintain the garment’s protective integrity. Follow guidelines like ASTM F1449 for proper restoration.

9.6 Q: Are there specific backings and bobbins I should use with fire retardant thread?

A: Yes, use flame-resistant backings and bobbin threads to ensure the entire embroidery assembly maintains flame resistance. Brands like Madeira offer compatible options for both.

Still have questions? Drop them in the comments or consult your thread supplier for expert advice—your safety is worth every stitch.