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Technical data

Elasticord

Elasticord is selected for a specific machine, product path and process requirement. Parameters are confirmed with samples and customer-side tests.

Discuss the specification
A raw-material property is not a finished-product test result

Material data supports preliminary selection. Product behaviour also depends on construction, diameter, finish and process conditions. Critical applications require tests and documentation for the exact variant.

MAL-EL-001

Elasticord — braided elastic core

Data sheet PDF

Manufacturer-declared, document review pending · Specification and availability require confirmation.

Identification and construction

Construction
Braided elastic core
Variant materials
Polyester PET + Elastic core
Diameter for specification
1–3 mm
Colour
to specification
Winding
machine-ready winding, spool

Finished-product performance

Elongation
Up to 90% (manufacturer declaration; method not published)
Food contact
Declared on Malkop website; compliance file pending review

Parameters to agree

A complete specification of the following parameters has not been published for this family. They are agreed for the selected construction and operating conditions; they must not be treated as verified properties.

  • Cover-yarn linear density · tex / dtex
  • Finished-product linear density · tex
  • Cover and core construction
  • Twist · S/Z · TPM
  • Breaking force
  • Length per unit mass
  • Operating temperature

Materials and application limits

Polyester PET

A low-moisture thermoplastic fibre for wet and technical uses away from oven heat and flame.

Heat
Moderate heat; variant test
Flame
Melts and may drip
Moisture absorption
Low
  • Polyester can soften and melt at elevated temperature.
  • Melting temperature is not a service-temperature limit; time, load, moisture, crystallinity and construction all matter.
  • Do not recommend it for wicks, oven use or smoking.
Material evidence
Commercial moisture regain
0.4% commercial regain reference. This supports low moisture uptake directionally but is not a finished-product water-resistance rating.Commercial mass and directional comparison only.
PET melting peak in cited DSC samples
Approximately 255-259 C peak melting temperature in the cited PET fabric samples. This is not a safe working-temperature limit.Material identification and hazard context only. Service temperature must come from finished-product testing under load and exposure time.
Combined humidity and temperature degradation
PET hydrolytic degradation depends on temperature, humidity, crystallinity and molecular orientation; low moisture regain alone is not sufficient evidence for hot-wet service.Use to trigger a steam or hot-wet product test, not to approve a variant.
Thermoplastic response to heat and flame
Polyester can shrink, melt and drip under flame exposure. The exact behaviour depends on construction and additives.Hazard communication only; not a classification of a Malkop product.

Elastic core

The functional Elasticord core for automatic tying. Chemistry and thermal behaviour require supplier data for the exact core.

Heat
No heat applications
Flame
Core degrades; supplier data required
Moisture absorption
Low
  • The exact core chemistry and thermal behaviour require supplier data; no universal melting statement should be made.
  • The elastic core is not intended for high-temperature use.
  • Automatic-machine use requires a trial on the target machine.
Material evidence
Elasticord application and declared stretch
Malkop identifies Elasticord as an elastic rubber thread for automatic winding machines and declares stretch up to 90%; the definition and test method require confirmation for the ordered variant.Commercial scope only. Confirm force, set, recovery, construction and method for the exact product.
Finished Elasticord test-method gate
ASTM D2731 covers elastomeric yarn tests but excludes covered, wrapped and core-spun yarns from its published scope. A method for the finished Elasticord construction must therefore be agreed and validated.Test-planning requirement; not a finished-product performance result.
Documentation and parameter verification plan

Approval for a particular application requires an approved specification, tests and documents. This sheet is not a certificate.

Agreed finished-cord cyclic tensile method, ASTM D2731 as a benchmark only after scope review, Machine trial with the customer's tying equipment

TDS-MAL-EL-001
Request a sample of this variantSend requirements

Yarn count and twist

Ne / Nm, linear density in tex, ply count and S/Z twist with TPM describe different product characteristics. Finished-cord diameter is specified separately.

For elastic cords, we also specify the core construction, number of braid carriers and yarns per carrier. A single PLY value does not replace these details.

Textile designations and the Ne 6/3 example
NeEnglish cotton count
Number of 840-yard hanks per pound of yarn. Higher count means lower linear density, not diameter in mm.
NmMetric count
Metres of yarn per gram. Nm and Ne are different systems; Nm 6 is not the same as Ne 6.
tex / dtexLinear density
tex: grams per 1,000 m; dtex: grams per 10,000 m. 1 tex = 10 dtex. State whether the value applies to a component yarn or the finished product.
PLYNumber of component yarns
Number of yarns combined at a given plying stage. Specify each stage of a cabled construction separately; ply is not the number of individual fibres.
S / ZTwist direction
Direction of the twist. For plied yarns, distinguish the component-yarn twist from the final plying twist.
TPM · turns/mTwist level
Turns per metre. TPI means turns per inch; 1 TPI ≈ 39.37 TPM. S or Z alone does not specify the twist level.
N / cN/texBreaking force / tenacity
Force at break and force relative to linear density. Comparison requires consistent test methods and conditions.
%Elongation at break
Change in length at break. This is not the same as an elastic cord's working extension.

Designation example, not a MALKOP product specification

Ne 6/3: three Ne 6 singles, or 3 PLY. Each single is approximately 98.4 tex; the nominal total is approximately 295.3 tex before twist contraction. By comparison, Nm 6 is approximately 166.7 tex.

Conversions: tex ≈ 590.6 / Ne (cotton); tex = 1000 / Nm. Yarn count does not convert directly to cord diameter.

Terminology references: CottonWorks: Ne, tex, Nm, PLYISO 2061Safilin: Nm, PLY

Calculators: length, mass and winding
CALC / VARIANT DATA

Engineering calculators

METERS → KGDATA REQUIRED
NUMBER OF SPOOLSDATA REQUIRED
MONTHLY METERSDATA REQUIRED
MONTHLY SPOOLSDATA REQUIRED

Calculations run only with actual parameters for a specific variant. Missing data is never treated as zero. Cost remains disabled until pricing is enabled by an administrator.