IEC 60811-406 Stress Cracking Test for PE and PP Cable Compounds

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IEC 60811-406 Cable Compound Stress Cracking Tester | UnitedTest

IEC 60811-406 tests environmental stress cracking resistance for polyethylene and polypropylene compounds used in electric and optical fibre cables. UnitedTest manufactures IEC 60811-406 compliant ESC testing machines for cable material quality certification.

IEC 60811-406 is an international standard specifying miscellaneous test methods for non-metallic materials of electric and optical fibre cables, focusing on evaluating environmental stress cracking (ESC) resistance of polyethylene (PE) and polypropylene (PP) compounds. This updated standard supersedes Clause 8 of the outdated IEC 60811-4-1:2004, retaining all original technical test procedures with no functional modifications to ensure consistent and reliable test results for cable material evaluation.

Primarily applicable to polymer insulation and sheath materials for communication cables, power cables and optical fibre cables, the test method detects material susceptibility to stress cracking under combined mechanical stress and environmental exposure. It effectively verifies the long-term structural stability, aging resistance and service durability of PE and PP cable compounds, supporting cable material formulation optimization, batch production quality control, and industry regulatory compliance for electrical and optical cabling systems.

UnitedTest designs and manufactures high-precision IEC 60811-406 stress cracking resistance testing machines. Our professional test equipment fully complies with official IEC standard protocols, delivering accurate and repeatable environmental stress cracking test data for cable manufacturing factories, polymer laboratories and third-party cable material certification institutions.

Test Principle

A moulded sheet of the compound is cut into strips, each strip is notched (creating a defined stress concentrator), then bent 180° so the notch sits on the outer (tension) surface, and the bent strips are held in a brass channel under constant strain. They are then immersed in a surfactant reagent (Igepal CO-630 / Antarox CO-630) at 50 °C for a fixed time (24 h or 48 h).

The surfactant does not chemically attack the polymer; it wets the surface, lowers the local surface energy and accelerates the initiation and growth of craze/crack fibrils at the notch root. Under this combined mechanical strain + chemical environment, susceptible compounds crack in hours rather than years.

Key consequence: this is an accelerated, comparative screening / pass-fail test, not a design-life prediction method. Results are expressed as a failure count (F₅₀ / F₀ convention) at a fixed exposure time.

Two Specific Test Methods:

Item	Method A (less‑severe condition)	Method B (more‑severe condition)
Reagent	100 % Igepal CO‑630 (Antarox CO‑630), water content ≤ 1 %	10 % volume‑by‑volume aqueous solution of Igepal CO‑630; stir 1 h at 60‑70 °C, use within 7 days
Test temperature	50 °C	50 °C
Test duration	24 h	48 h
Pass‑failure criteria	≤ 5 out of 10 specimens fail; if 6 fail, one retest permitted with new sheet, again max 5 failures allowed	Zero failures permitted for 10 specimens; any single crack means failure; one retest allowed with zero failures required
Application scenario	Mild service environment	Harsh, high‑stress environment

Test equipment for IEC 60811-406 Stress Cracking Test for PE and PP Cable Compounds

UnitedTest ESC-95 series Environmental Stress Cracking Resistance (ESCR) Apparatus determines the susceptibility of ethylene plastics to stress-cracking when exposed to different environments such as soaps, wetting agents, oils and detergents.

Equipment Component	Specifications	Purpose
Blanking Die and press	Rectangular, cuts specimens to 38±2.5 mm × 13±0.8 mm	to punch standard‑size test‑pieces from compression‑moulded sheets.
Notching Jig	Precision fixture with sharp blade.	produces a controlled notch; blade maximum service life ≤100 notches.
Bending‑clamp assembly plus vice	Brass channel (Inner width 11.75±0.05mm).	applies fixed bending deformation to ten specimens simultaneously.
Test Tubes	length 200 mm, inner diameter 32 mm, sealed with aluminium‑foil‑wrapped cork stoppers.	Contain test solution and specimens.
Heated bath container	maintains constant temperature of (50 ± 0.5) °C, sufficient thermal capacity so temperature never drops below 49 °C upon inserting test‑tube racks.	Control thermal environment.
Bending clamp	Closing time 30-35 seconds (using a vise/press), ensure the stress is applied evenly.	Used to clamp the test specimen uniformly.

Test Specimen Information

Item	Requirement
Source	Moulded test sheet prepared, 150 mm × 180 mm × (3.3 ± 0.1) mm
Number per test	10 test pieces (one brass channel holds ten)
Cut position	> 25 mm from the sheet edges; cut so the web between holes is not damaged
Dimensions	(38.0 ± 2.5) mm × (13.0 ± 0.8) mm
Thickness & notch depth	Depends on unfilled resin density (See below table)
Edges	Square edges mandatory — bevelled edges may give erroneous results
Notch	Made shortly before immersion with the notching device; notch placed up (outer tension side) when bent

Table — Notched test piece size vs. PE density (density = unfilled resin, per IEC 60811-100 Clause 5)

Density	Length	Width	Thickness	Notch depth D
< 0.940 g/cm³	38.0 ± 2.5 mm	13.0 ± 0.8 mm	3.00 – 3.30 mm	0.50 – 0.65 mm
≥ 0.940 g/cm³	38.0 ± 2.5 mm	13.0 ± 0.8 mm	1.75 – 2.00 mm	0.30 – 0.40 mm

Test procedure of IEC 60811-406 Stress Cracking Test for PE and PP Cable Compounds

Prepare sheet (mould → condition → visual check).

Cut 10 test pieces with the blanking die, > 25 mm from edges, square edges; verify thickness with the dial gauge against requirement.

Notch each piece shortly before immersion; blade sharp/undamaged (≤ 100 notches).

Place the ten pieces notch up in the bending clamp; close the clamp over 30 s – 35 s at constant speed (vice or motor-driven arbor press).

Transfer the bent pieces with the transfer tool into the brass channel; press down manually any piece riding too high.

Within 5 min – 10 min of bending, insert the holder into the test tube, fill with reagent until all pieces are covered, cork the tube.

Immediately place the tube in the rack in the 50 ± 0.5 °C bath for 24 h (A) or 48 h (B); ensure pieces do not touch the tube wall; record the moment of insertion.

Test parameters and stipulations:

Condition / requirement	Method A (less severe)	Method B (more severe)
Reagent	100 % Igepal CO-630 (Antarox CO-630) or chemically identical product	10 % by volume aqueous solution of Igepal CO-630
Test temperature	(50 ± 0.5) °C	(50 ± 0.5) °C
Duration (minimum)	24 h	48 h
Requirement (failure rate)	Max. 5 of 10 test pieces (F₅₀)	0 test pieces (F₀)
Sheet pressing	165–170 °C, 50–200 kN, 2 min	same
Sheet conditioning	per polymer type, cooling (5 ± 2) K/h to (29 ± 1) °C	same

Evaluation and pass/fail stipulation:

Cracking typically starts at the notch and runs at right angles to it. The first visible sign of a crack, judged with normal or corrected vision without magnification, constitutes failure of that test piece.

Method A — after 24 h: ≤ 5 failures = pass. If 6 fail → not passed. The test may be repeated once with ten pieces from a new test sheet; again ≤ 5 must fail.

Method B — after 48 h: 0 failures = pass. If 1 fails → not passed. One repeat allowed from a new sheet; 0 must fail.

Test Applications

This test belongs to the IEC 60811 series of non‑metallic‑material test standards for cables.

- Primary use: qualification of polyethylene and polypropylene sheath compounds for communication cables, optical‑fibre cables.

- Also referenced for power cables, control cables, ship‑board and offshore cables that adopt PE / PP sheathing.

- Used in raw‑material incoming inspection, compound‑formula development, cable‑product type‑approval testing and quality‑conformity verification.

Telecommunication and optical fibre cable industry — qualification and batch acceptance of PE/PP sheathing (jacket) compounds; primary users are cable makers, compounders, independent test labs, specifiers/procurement.

Coaxial and data cables (PE dielectric/jacket) and outdoor aerial/duct/buried cable designs, where jackets face bending strain, residual stress, and contact with detergents, oils, soil surfactants and moisture.

Referenced by / called up in a large family of cable product standards: IEC 60794-3 (outdoor optical cables), IEC 60794-4 (aerial OPGW-adjacent), IEC 60794-6-10/-6-20/-6-30 (indoor-outdoor), IEC 61196-4/-9/-11 (radiating, RF flexible, semi-rigid coax), IEC 62783-1 (twinax), EN 50290-2-34 (PE sheathing compound for outdoor optical fibre cables), and power-cable test-method standards (IEC 60840 / IEC 62067 class).

Related Standard:

ISO 4599	Plastics — Determination of resistance to environmental stress cracking (ESC) — Bent strip method
ISO 22088-3	Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 3: Bent strip method
ASTM D1693	Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
IEC 60811-4-1	Testing methods for Insulating and sheathing materials of electric and optical cables
IEC 60811-406	Electric and optical fibre cables - Test methods for non-metallic materials - Part 406: Miscellaneous tests - Resistance to stress cracking of polyethylene and polypropylene compounds
ASTM D2561	ESC of blow-moulded PE containers (surfactant fill, internal pressure)

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ESC-95 Environmental Stress Cracking Resistance (ESCR) Apparatus determines the susceptibility of ethylene plastics to stress-cracking when exposed to different environments such as soaps, wetting agents, oils and detergents.

Q1: What is IEC 60811‑406 test, and why is it important for cable PE / PP sheathing compounds?

A: IEC 60811‑406 is an IEC standard test for environmental stress‑crack resistance (ESCR) of polyethylene and polypropylene raw granule compounds for communication and optical‑fibre cables. Polyethylene cable sheaths suffer brittle cracking under persistent mechanical stress when exposed to surfactants, oils or underground chemical contaminants in real‑world service. This accelerated lab test screens material formulation quality before cable manufacturing, preventing premature sheath cracking, insulation failure and short cable service life. It is a mandatory material‑qualification requirement for many cable type‑approval projects.

Q2. Why is a notch necessary?

A. The notch creates a reproducible stress concentrator so cracking starts at a defined location and time instead of at random weak points. cracking generally starts at the notch and runs at right angles to it. This is also why notch depth must be uniform along its length and edges must be square.

Q3: Can I cut test specimens directly from finished cable sheath?

A: No. The standard explicitly states this test applies only to original raw sheath‑material granules. Specimens must be compression‑moulded test sheets following normative Annex A, not sliced from extruded finished cable jackets.

Q4: Why notch depth D must vary according to PE resin density?

A: HDPE (>0.940 g/cm³) is stiffer; notch depth is controlled 0.30‑0.40 mm. LDPE / MDPE (≤0.940 g/cm³) is softer, notch depth 0.50‑0.65 mm. Different notch depths ensure consistent stress concentration at notch root for different‑density polyethylene grades, avoiding false‑pass or false‑fail test outcomes.

Q5. Does the reagent chemically attack the polyethylene?

A. No. The surfactant does not chemically degrade the polymer. It wets and plasticises the craze zone, lowers the local surface energy and speeds up the breakdown of the fibrils that bridge a growing crack. This is why ESC failures occur at stresses far below the material's yield strength.

Q6: How to judge specimen failure? Do I need microscope for crack checking?

A: A specimen fails once any visible crack originates from the notch, running perpendicular to notch. Inspection uses naked normal/corrected human eyes; magnification / microscope is forbidden for failure evaluation per standard text.

Q7: What if my first test fails? Am I allowed retesting?

A: Only one retest is permitted. Retest specimens must come from a brand‑new compression‑moulded sheet.

Method A retest: ≤5 failures in new 10‑piece group to pass.

Method B retest: zero failures in new 10‑piece group to pass. Two consecutive failures mean the material does not satisfy standard requirements.

Q8. How often must the notching blade be changed?

A. The blade must be neither dull nor damaged and shall be replaced as required — it should not be used for more than 100 notches even under favourable conditions.

Q9. Why is the 5–10 minute window between bending and immersion important?

A. It fixes the amount of stress relaxation / recovery allowed before the reagent is applied. Varying this delay changes the effective strain at the notch and therefore the failure count, so the standard bounds it to keep results comparable.

Q10. What material properties does a good ESCR result indicate?

A. High stress-crack resistance reflects favourable molecular weight and molecular-weight distribution, comonomer type and content, short-chain branching, density, crystallinity and morphology, plus good carbon-black and antioxidant dispersion. That is also why the standard tightly controls moulding and cooling history.

Q11. What are the main limitations of the test?

A. (i) It is a screening / ranking test, not a lifetime prediction.

(ii) It is performed on moulded sheets of virgin granules, so it does not capture extrusion-induced orientation, weld lines, or jacket-thickness effects in the real cable.

(iii) Results are sensitive to notch depth, blade sharpness, edge squareness, reagent water content and bath stability — poor control here is the main cause of inter-laboratory scatter.

Q12: Why choose IEC 60811‑406 Environmental Stress Cracking Test Machine from UnitedTest?

A: Cable sheathing compounds fail in the field for one reason more often than any other: environmental stress cracking. A polyethylene or polypropylene jacket under bending strain, exposed to surfactants, oils, detergents or aggressive soil chemistry, can crack at stresses far below its yield strength — long before any mechanical test would predict a problem. IEC 60811-406 is the international test method the cable industry uses to screen that risk before a compound ever reaches production.

UnitedTest supplies a complete IEC 60811-406 stress cracking test system — from specimen preparation through to the 50 °C immersion bath — engineered around the exact geometry and tolerances the standard specifies. Whether you are qualifying a new PE jacketing compound, running incoming inspection on granules, or issuing third-party test reports to IEC 60794 or EN 50290-2-34, our apparatus gives you repeatable, defensible results with traceable temperature control.

Why labs choose UnitedTest

Built to the tolerances that matter — notching device and "Gem"-type blade system, bend clamp with controlled 30–35 s closing, transfer tool for single-operation loading, brass channel holder with (11.75 ± 0.05) mm internal width for ten specimens, and 200 mm × ⌀32 mm hard glass test tubes.

Bath stability you can document — heated immersion bath held at (50 ± 0.5) °C with sufficient thermal capacity that the temperature does not fall below 49 °C when loaded tubes are inserted, the condition IEC 60811-406 explicitly requires.

Full upstream preparation — matched blanking die and press for 38.0 × 13.0 mm strips, thickness dial gauge at 5–8 N/cm², plus moulding press, chases and the forced-air oven with (5.0 ± 0.5) K/h programmed cooling needed for Annex A sheet preparation and conditioning.

Method A and Method B in one setup — 24 h / 100 % reagent and 48 h / 10 % aqueous reagent workflows use the same hardware; only the reagent and duration change.

Multi-standard value — the same bent-strip platform supports ASTM D1693 ESCR work, so one investment covers cable and general polyolefin testing.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you