To: Design & Procurement Engineers
From: The Material Science Team
Date: August 28, 2025
Subject: Guide to Properly Specifying Custom Aramid/Kevlar® Blankets to Ensure Performance and Prevent Errors
Introduction
Specifying a high-performance material like a Kevlar blanket requires more than just length and width. A generic specification can lead to premature failure, inadequate protection, or unnecessary costs. This document serves as a comprehensive checklist to ensure every critical variable is considered during your design and procurement process.
Following this guide will help you create a precise specification sheet, enabling a manufacturer to produce a custom Kevlar blanket that meets your exact performance requirements on the first iteration.
Step 1: Define the Operating Environment (The ‘Why’)
Before specifying the blanket, detail the environment it must survive.
☐ 1.1 Thermal Profile:
- Continuous Operating Temperature: ______ °C / °F
- Why it matters: This is the baseline temperature the blanket will endure for extended periods. It dictates the base fabric’s suitability.
- Peak / Intermittent Temperature & Duration: ______ °C / °F for ______ seconds/minutes
- Why it matters: Brief exposures to extreme heat (like molten spatter) may require specialized coatings (e.g., vermiculite) that a base fabric alone cannot handle.
☐ 1.2 Mechanical Hazards:
- Abrasion: (Describe the source, frequency, and nature of the friction)
- Example: “Constant, low-pressure rubbing against a T-304 stainless steel frame.”
- Cut / Puncture: (Describe the source and sharpness)
- Example: “Occasional contact with sharp edges of freshly stamped sheet metal.”
- Impact: (Describe the force and frequency)
- Example: “Low-force impacts from dropped hand tools.”
☐ 1.3 Chemical Exposure:
- List all chemicals, oils, or fluids the blanket will encounter: ____________________
- Why it matters: This determines the necessity of a protective coating. An uncoated Kevlar blanket has moderate chemical resistance, but specific fluids may require a non-porous barrier like Silicone or PTFE.
Step 2: Specify the Physical Construction (The ‘What’)
With the environment defined, you can now select the blanket’s core components.
☐ 2.1 Base Fabric Weave: (Select one)
- [ ] Plain Weave: Best for dimensional stability and as a uniform base for coatings.
- [ ] Twill Weave: Best for flexibility, drapability, and superior tear/abrasion resistance.
- Expert Tip: Reference our guide, “The Art of the Weave,” for a detailed comparison.
☐ 2.2 Fabric Weight / Thickness:
- Required Weight: ______ oz/yd² (or g/m²)
- Why it matters: Higher weight generally correlates with greater durability and thermal insulation but reduced flexibility.
☐ 2.3 Coatings & Treatments: (Select one or specify ‘None’)
- [ ] Uncoated (Natural)
- [ ] Silicone Coated: (Specify 1 or 2 sides; Color: Red, Gray, Black)
- Use: Excellent for water/oil repellency, abrasion resistance, and a non-slip surface.
- [ ] PTFE Coated:
- Use: Ultimate chemical resistance and a low-friction, easy-to-clean surface.
- [ ] Other: (e.g., Vermiculite, UV-Resistant Urethane)
Step 3: Detail the Fabrication & Dimensions (The ‘How’)
This is where the custom blanket takes its final shape.
☐ 3.1 Dimensions & Tolerances:
- Provide a CAD drawing or a detailed, dimensioned sketch. This is the single most effective way to prevent errors.
- Length: ______ (mm / in) Width: ______ (mm / in)
- Required Tolerance: +/- ______ (mm / in)
☐ 3.2 Seams & Edging:
- Stitching Material: MUST be specified as Kevlar®/Aramid thread.
- Critical Note: Using a standard thread like polyester creates a weak point that will fail at high temperatures long before the fabric does.
- Edge Finishing: (Select one)
- [ ] Hemmed: A clean, folded-over edge.
- [ ] Serged: A durable, overwrapped edge to prevent fraying.
☐ 3.3 Fasteners & Mounting Points:
- Specify type and exact locations on your drawing.
- [ ] Grommets: (Specify Material: Brass / Stainless Steel; Inner Diameter: ______; Spacing: ______)
- [ ] High-Temperature Velcro®
- [ ] Snaps / Buckles
- [ ] Straps with D-Rings
- [ ] Integrated Springs for tensioning
Conclusion: From Specification to Solution
A detailed specification sheet is the foundation of a successful project. It eliminates ambiguity, ensures accurate quoting, and guarantees the final product is an engineered solution, not a generic commodity. By using this checklist, you provide all the necessary data for a manufacturer to serve as a true partner in solving your engineering challenges.
