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Specs
Overview: Aerospace & Military Standards
- Lacing tape (flat braid): Legacy MIL-T-43435B defined Types I–V (nylon, polyester, fluorocarbon/PTFE, fiberglass, aramid). It’s been superseded by CID A-A-52080 through A-A-52084, which preserve those categories and set dimensional and minimum breaking-strength requirements per type/size/finish. Parts are identified by spec + type + size + finish (e.g., A-A-52084 Size 3, Finish B).
- Lacing cord/twine (round): MIL-DTL-713 (formerly MIL-T-713) covers Type P nylon cord, Class 1 (waxed) and Class 2 (unwaxed), with controlled diameter, tensile (e.g., ~70 lb typical for Size 1), and wax properties (microcrystalline wax w/ fungicide). Frequently cited in military maintenance.
- NASA workmanship: NASA-STD-8739.4 requires lacing materials’ properties (flammability, arc tracking, vacuum stability, etc.) be appropriate to the application; programs use APLs emphasizing low-outgassing and self-extinguishing materials (e.g., Nomex, PTFE, PTFE-glass). Space use typically requires ASTM E595 compliance.
- Flammability & interiors: For aircraft passenger compartments, materials generally must meet FAR 25.853; Nomex/PTFE tapes are often selected because they don’t propagate flame.
MIL-T-43435 Types I–IV (CID A-A-52080 Series)
| Legacy Type | Current CID | Form | Primary Material | Typical Finish Options |
| Type I | A-A-52080 | Flat braided tape | Nylon (polyamide) | A (none), B (wax), C (elastomer), E (vinyl), G (liquid nylon) |
| Type II | A-A-52081 | Flat braided tape | Polyester (Dacron) | A, B, C, E, G (similar to Type I) |
| Type III | A-A-52082 | Flat braided tape | PTFE (Teflon®) | Usually uncoated or low-friction synthetic finish; used for high temp/chemicals/low outgassing. |
| Type IV | A-A-52083 | Flat braided tape | Fiberglass (typically PTFE-coated) | Pre-impregnated (PTFE/silicone) to control fray; extreme heat tolerance. |
Notes: The CID series replaced MIL-T-43435; each type/size defines minimum width, thickness, and breaking strength. Finish selection affects knot security, fungus resistance, and outgassing.
NASA-STD-8739.4 Overview
- Material suitability: Lacing materials’ flammability, arc-tracking resistance, heat range, and vacuum stability must be matched to the environment (engines, avionics bays, vacuum).
- Low outgassing for flight hardware: NASA commonly requires ASTM E595 limits (TML < 1.0 %, CVCM < 0.10 %). PTFE, Nomex, and PTFE-coated fiberglass are favored for meeting these thresholds; waxed nylon is typically avoided for space due to outgassing.
- Approved Parts Lists (APL): Centers (e.g., MSFC) maintain APLs of lacing tapes/cords qualified for space use; “NASA spot tie” methods are commonly referenced for workmanship.
ASTM D2256 & ISO Testing
- What we verify: The CID specs (A-A-52080…84) and MIL-DTL-713 define minimum breaking strengths by type/size; suppliers certify conformance and provide tensile data aligned to those requirements.
- Common lab methods: In addition to spec-defined break-strength checks, tensile testing for yarns/cordage in this category is commonly performed using ASTM D2256 (single-strand tensile of yarns) or ISO-method equivalents for fiber yarns/twines, alongside environmental tests (e.g., ASTM E595 for outgassing in space applications) when required by program QA. (The PDF emphasizes E595 and spec-driven strength requirements; ASTM/ISO tensile methods are typical industry practice for cords/yarns.)
📜 Relevant Specifications – Move to specifcations page
| Spec Code | Description |
| MIL-T-43435 | Military specification covering Nomex®, PTFE, nylon, and polyester lacing cords and twines |
| ASD-EN 6049-003 | European aerospace standard for lacing cords |
| NASA-STD-8739.4 | NASA workmanship standard detailing acceptable lacing and tying methods |
| ASTM D2256 | Tensile testing standard for verifying cord performance |
Certification Pack Downloads
Typical certification/documentation package available upon request:
- Certificate of Conformance (CoC): to A-A-52080/81/82/83/84 (by type/size/finish) or MIL-DTL-713 Type P as applicable.
- Test Data Sheet: Minimum breaking strength per spec/size; finish identification (A/B/C/E/G) and lot traceability.
- NASA Space Use Evidence (if applicable): ASTM E595 outgassing results (TML/CVCM) for materials like PTFE, Nomex, PTFE-glass.
- Flammability/Interiors (if applicable): Statement of material suitability relative to FAR 25.853 for aircraft interiors.
- Regulatory Declarations: RoHS, REACH, and Prop 65 where required.
Helpful Material Ranges (reference)
- Nomex (A-A-52084 / Type V): –55 °C to +260 °C; self-extinguishing; typical Size-dependent break strengths (e.g., ~85 lb for Size 1).
- PTFE (A-A-52082 / Type III): –73 °C to +232 °C continuous; non-flammable; low outgassing.
- Fiberglass, PTFE-coated (A-A-52083 / Type IV): –73 °C to +260 °C (short-term higher); very high tensile; non-flammable.
- Nylon (A-A-52080 / Type I) & Polyester (A-A-52081 / Type II): General-purpose; ensure finish and environment suitability (temp, moisture, flammability).
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MIL-DTL-713 (Type P Round Cord) — Quick Table
| Class | Coating | Typical Use | Notes |
| Class 1 | Waxed (microcrystalline w/ fungicide) | General avionics/loom lacing | Excellent knot-hold; avoid for space/vacuum. |
| Class 2 | Unwaxed | High-temp/clean environments | Lower knot friction; use locking knots. |
Finish Codes (Effect on Performance)
| Finish | What it is | Why it’s used | When to avoid |
| A (None) | Uncoated fiber | Clean, low outgassing | Slippery; knot security relies on technique. |
| B (Wax) | Microcrystalline wax + biocide | Superior knot security; mildew resistance | Space/vacuum or very high temp. |
| C (Elastomer) | Synthetic rubber | Grip + abrasion resistance | Programs prohibiting elastomers/additives. |
| E (Vinyl) | PVC-type resin | Flame resistance; body | Halogen-free mandates; high-heat zones. |
| F (Silicone/Resin) | Silicone/thermoset | Heat, flexibility, self-extinguishing | Outgassing-sensitive builds (verify). |
| G (Liquid Nylon) | Nylon resin dip | Fray control; handling | Where added polymers aren’t allowed. |
Size & Tie Spacing Guidance
- Typical sizes:
- Size 1–2: Large looms / structure runs
- Size 3–4: General avionics bundles
- Size 5–6: Fine harness branches / pigtails
- Tie interval: 25–50 mm (1–2″) on straight runs; closer near breakouts/bends.
- Terminations: Locking knot at ends; re-tie after every branch.
Material Selection Matrix (Quick Pick)
| Environment | Nylon | Polyester | Nomex® | PTFE | Fiberglass/PTFE |
| Cabin/Avionics (–40 °C to +90 °C) | ✓ | ✓ | ✓ | ✓ | – |
| Near engines/bleed air (≥150 °C) | – | – | ✓ | ✓ | ✓ |
| Fuel/chem/fluids exposure | △ | ✓ | ✓ | ✓ | ✓ |
| Space/vacuum (low outgassing) | – | – | ✓* | ✓* | ✓* |
| Continuous flex / robotics | ✓ | ✓ | ✓ | △ (slick) | – |
*Verify program APL/outgassing data for spaceflight.
Workmanship & Knots (Field-Proven)
- Preferred stitch: NASA spot-tie (clove hitch + square/reef knot).
- Edge cases: Use continuous spiral lacing on long parallel runs to prevent cable migration.
- No sharp edges: Trim tails flush; no stubs like zip-ties.
- Strain relief: Serve (wrap) exits from circular backshells before heat-shrink boots.
Outgassing & Flammability Notes
- Space hardware: Require ASTM E595 (TML < 1.0 %, CVCM < 0.10 %). Favor PTFE, Nomex, PTFE-glass.
- Aircraft interiors: Confirm compliance vs FAR 25.853 (self-extinguishing).
- Halogen policies: Where halogen-free is mandated, avoid PVC-type finishes (use Nomex/PTFE).
QA, Traceability & Lot Control
- Per-lot docs: Spec/type/size/finish, date code, lot, spool length.
- Verifications kept on file: Breaking strength by size, finish verification, outgassing (if applicable), RoHS/REACH/Prop 65.
- Receiving check: Width/thickness tolerance, braid quality (no picks/gaps), finish uniformity, color tracer for aramids.
Storage & Shelf Life
- General: Cool, dry, UV-protected.
- Waxed finishes: Keep sealed; re-condition gently if stiff (room-temp warm-up).
- Inorganic/PTFE-glass: Indefinite shelf life when stored properly.
Packaging & Put-Ups
- Flat tapes: 250 yd / 500 yd spools common; certain sizes to 1500 ft.
- Round cord: Cones or tubes by length/weight.
- Colors: Natural/black standard; Nomex often natural with tracer; custom colors by MOQ.
Part Numbering (Example Pattern)
[Spec] – [Type/Material] – [Size] – [Finish] – [Color] – [Put-Up]
Example: A-A-52084 – Nomex – Size 3 – Finish B – Natural – 500 yd
Compatibility & Handling
- Avoid lacing directly over knife-edge features; add sleeve or cushion layer.
- For low-friction PTFE, use locking finish knots or select a light elastomer finish if program-permitted.
- In EMI shield zones, serve shield ends with aramid/poly tape before heat-shrink to maintain 360° contact.
Expanded Testing Call-outs
- Tensile: ASTM D2256 (single-strand yarn/cord), report avg break & CV%.
- Thermal aging: Conditioned tensile after high-temp dwell.
- Flame: Vertical burn (per program), self-extinguish time & after-flame length.
- Outgassing (space): ASTM E595 TML/CVCM w/ lot IDs.
- Dielectric (if required): Insulation resistance post-soak/temperature cycle.
Certification Pack — Add-On Files
- Spec Conformance Matrix (PDF): Crosswalk of your stocked SKUs vs A-A-5208x / MIL-DTL-713.
- Outgassing Summary (PDF): TML/CVCM by material/finish (space programs).
- FAR 25.853 Statement (PDF): Interior use applicability by material/finish.
- RoHS/REACH/Prop 65 (PDF): Current declarations.
- Workmanship Guide (1-pager): Approved knots, spacing, terminations.