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Ministry of Defence

Defence Standard

40-8/Issue 3 30 October 1998

CORD, LACING AND TAPE LACING INCLUDING

LIMITED FIRE HAZARD VARIANTS

This Defence Standard supersedes

Def Stan 40-8/Issue 2

dated 7 February 1983

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AMENDMENTS ISSUED SINCE PUBLICATION

AMD NO DATE OFISSUE TEXT AFFECTED SIGNATURE &DATE

Revision Note

This revision has been issued to introduce lacing tape and limited fire hazard (LFH) variants.

Historical Record

This Defence Standard 40-8/Issue 3 supersedes Defence Standard 40-8/Issue 2 dated 7February 1983.

Defence Standard 40-8/Issue 2 superseded Defence Standard 40-8/Issue 1 dated 28 June

1978.

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CORD, LACING AND TAPE, LACING

PREFACE

This Defence Standard supersedes

DEF STAN 40-8 Issue 2dated 7 February 1983

i This Defence Standard summarises the test methods and general requirements for Cord,Lacing and Tape, Lacing including LFH variants for Ministry of Defence (MOD) use.

ii This Defence Standard has been prepared because there is no suitable British or CECCStandard acceptable to the MOD. When a suitable British or CECC Standard becomesavailable this Defence Standard will be amended to implement the British or CECC Standardfor MOD use.

iii This Standard has been agreed by the authorities concerned with its use and is intended tobe used whenever relevant in all future designs, contracts, orders etc and wheneverpracticable by amendment to those already in existence. If any difficulty arises whichprevents application of this Defence Standard, the Directorate of Standardization shall beinformed so that a remedy may be sought.

v Any enquiries regarding this Standard in relation to an invitation to tender or a contract inwhich it is incorporated are to be addressed to the responsible technical or supervisingauthority named in the invitation to tender or contract.

vi This Standard has been devised for the use of the Crown and its contractors in theexecution of contracts for the Crown. The Crown hereby excludes all liability (other than

liability for death or personal injury) whatsoever and howsoever arising (including butwithout limitation, negligence on the part of the Crown its servants or agents) for any loss ordamage however caused where the Standard is used for any other purpose.

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CONTENTS PAGE

Preface 1

Section One. General

1 Scope 32 WARNING 33 Related Documents 34 Definitions 45 Materials 46 Marking 47 Tests 4

Section Two. Lacing Cord

8 Test Details for Lacing Cord 5

Section Three. Lacing Cord, Limited Fire Hazard

9 Test Details for Lacing Cord Limited Fire Hazard 9

Section Four. Tape, Lacing

10 Test Details for Tape Lacing 14

Section Five. Tape Lacing Limited Fire Hazard

11 Test Details for Tape Lacing Limited Fire Hazard 15

Annex A A-1Annex B B-1

Table 1 16

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Section Two. Lacing Cord

8 Test Details for Lacing Cord

TESTNO

TITLE DESCRIPTION REQUIREMENTS

8.1

(i)

GENERALEXAMINATI0N

Visualexamination

The specimen shall be visuallyexamined.

The colour shall beblack. Theworkmanship and finishshall be such that thereshall be no visibleeccentricity, pinholes,splits or other defects.

Dimensions The diameter of the specimen shall

be measured. The method ofmeasurement shall be one that doesnot appreciably deform thespecimen.

The diameter of the

1 mm specimens shall bewithin the limits 1 mmto 1.2 mm

8.2 TENSILETESTING

The specimen shall be marked at150 mm intervals. the load shall beapplied freely, without anyconstraint and shall take the form ofa weight suspended by thespecimen under test.

(i) Working load 1 mm nominal diameter

a. A load of 6.75 kg shall beapplied gradually over a periodof 1 to 1 minutes andmaintained for 5 minutes

There shall be nobreakage.

(ii) Elongation The specimen shall be measuredwith the load still applied.

Elongation for each 150mm interval shall bewithin the followinglimits:1 mm nominal diameter

12 mm to 24 mm

(iii) Elasticity The load shall be removed andimmediately after an interval of oneminute the specimen shall bemeasured.

The variation from any150 mm interval shallnot exceed:6 mm for 1 mmnominal diameter.

(iv) Tensile strength The load shall be re-applied andthen increased until breakageoccurs.

Breakage shall occurwith a load notexceeding 16 kg for 1mm nominal diameter.

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TESTNO


8.3 KNOTTING For this test, a mandrel 6 mmnominal diameter is required. Themandrel shall be subjected to thedry heat and dry cold cycles withthe specimen. The method ofknotting is shown at Annex A.

(i) Temperature (dryheat)

The specimen and mandrel shall bemaintained at a temperature of35C-38C for 7 days. At the endof the period and while still at thistemperature, the specimen shall beknotted over the mandrel.

There shall be noindication of cracking orother deterioration.

(ii) Temperature (drycold)

The specimen shall be removedfrom the mandrel. The specimen

and mandrel shall then bemaintained at a temperature -5C to-8C for 6 hours.

At the end of the period and whilestill at this temperature thespecimen shall be knotted over themandrel.


8.4

8.4.1

CLIMATIC

Temperature (dry

heat)

As in BS 2011: part 2.1 Test B at a

temperature of 85C for 7 days.

(i) Flexibility At the end of the period whilst atthe high temperature the cord shall

be closely wound three times undera tension of 0.5 kg on a 6 mmdiameter mandrel which has beenconditioned with the specimens. Asuitable method is described inAnnex B.

There shall be noindication of cracking orany other deterioration.

8.4.2 Temperature (dry

cold)

As in BS 2011: Part 2.1 Test A at a

temperature of -40C (-30C forLFH) for 6 hours

(i) Flexibility At the end of this period whilst stillat this temperature the cord shall beclosely wound three times under atension of 0.5 kg on a 25 mmdiameter mandrel. The mandrelshall be conditioned with thespecimen. A suitable method isdescribed in Annex B.


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TESTNO


8.5 DAMP HEAT(long term)

As in BS 2011: Part 2.1 Test Ca.

8.5.1 Initialmeasurement

The specimen shall be marked at150 mm intervals and the followingmeasurement shall first be made, ifnot already recorded.

Dimensions The diameter of the specimen shallbe measured. The method ofmeasurement shall be one that doesnot appreciably deform thespecimen.

The diameter of the1 mm specimen shall bewithin the limits 1 mmto 1.2 mm

8.5.2 Final measure-ments

The specimen shall be subjected tothe conditions described in BS 2011

Part 2.1 for 21 days after which itshall be removed from the chamberand subjected to the following tests:

(i) Visualexamination


There shall be no visibleindication ofdeterioration in thematerials used.

(ii) Dimensions The diameter of the specimen shallbe measured. The method ofmeasurement shall be one that does

not appreciably deform thespecimen.

The diameter of the1 mm specimen shall bewithin the limits 1 mm

to 1.2 mm

(iii) Shrinkage The marked intervals shall bemeasured

The shrinkage at any 150mm interval shall not begreater than 8 mm forthe 1.0 mm nominaldiameter

(iv) Tensile testing The specimen shall be marked at150 mm intervals. The load shall

be applied freely, without any

constraint and shall take the form ofa weight suspended by thespecimen under test.

(v) Working load 1 mm nominal diameter

a. A load of 6.75 kg shall beapplied gradually over a periodof 1 to 1 minutes andmaintained for 5 minutes.

There shall be nobreakage

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TESTNO


8.5.2(vi)

Elongation The specimen shall be measuredwith the load still applied.

Elongation of the1 mm diameter cordshall be within 5 mm to35 mm per 150 mmlength.

(vii Elasticity The load shall be removed andimmediately after an interval of oneminute the specimen shall bemeasured.

The 1 mm nominaldiameter cord shall bewith 10 mm of itsoriginal measured 150mm length.

(viii) Visualexamination

The specimen shall be visuallyexamined externally and shall thenhave its outer covering removedand shall be examined internally.

There shall be no visibleindication of anydeterioration in thematerials used.

8.6 MOULDGROWTH

As in BS 2011: Part 2.1 Test J. Thespecimens should be cut to suitablelengths, such that when supportedupright in a glass specimen tubeapproximately 50% of the lengthwill protrude above the top of itssupporting tube.



No growth apparentunder a magnification of50 times.

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Section Three. Lacing Cord, Limited Fire Hazard

9 Test Details for Lacing Cord, Limited Fire Hazard

TESTNO


9.1 GENERALEXAMINATION



The colour shall be black.The workmanship andfinish shall be such thatthere shall be no visibleeccentricity, pinholes,splits or other defects.

(ii) Dimensions The diameter of the specimen shallbe measured. The method ofmeasurement shall be one that does

not appreciably deform thespecimen.

The diameter of the1 mm specimens shall bewithin the limits 1 mm to

1.2 mm

9.2 TENSILETESTING

The specimen shall be marked at150 mm intervals. the load shall beapplied freely, without anyconstraint and shall take the form ofa weight suspended by the specimenunder test.

(i) Working load 1 mm nominal diameter

a. A load of 6.75 kg shall beapplied gradually over a periodof 1 to 1 minutes andmaintained for 5 minutes

There shall be nobreakage.

(ii) Elongation The specimen shall be measuredwith the load still applied.

Elongation for each 150mm interval shall bewithin the followinglimits:1 mm nominal diameter12 mm to 24 mm

(iii) Elasticity The load shall be removed andimmediately after an interval of oneminute the specimen shall bemeasured.

The variation from any150 mm interval shall notexceed:6 mm for 1 mm nominaldiameter.

(iv) Tensile strength The load shall be re-applied andthen increased until breakageoccurs.

Breakage shall occur witha load not exceeding 16kg for 1 mm nominaldiameter.

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TESTNO


9.3 KNOTTING For this test, a mandrel 6 mmnominal diameter is required. Themandrel shall be subjected to the dryheat and dry cold cycles with thespecimen. The method of knottingis shown at Annex A.

(i) Temperature (dryheat)

The specimen and mandrel shall bemaintained at a temperature of35C-38C for 7 days. At the end ofthe period and while still at thistemperature, the specimen shall beknotted over the mandrel.


(ii) Temperature (drycold)

The specimen shall be removedfrom the mandrel. The specimen

and mandrel shall then bemaintained at a temperature -5C to-8 for 6 hours.

At the end of the period and whilestill at this temperature the specimenshall be knotted over the mandrel.


9.4

9.4.1

CLIMATIC

Temperature (dryheat)

As in BS 2011: part 2.1 Test B at atemperature of 85C for 7 days.

(i) Flexibility At the end of the period whilst at thehigh temperature the cord shall beclosely wound three times under atension of 0.5 kg on a 6 mmdiameter mandrel which has beenconditioned with the specimens. Asuitable method is described inAnnex B.


9.4.2 Temperature (drycold)

As in BS 2011: Part 2.1 Test A at atemperature of -40C (-30C for

LFH) for 6 hours

(i) Flexibility At the end of this period whilst stillat this temperature the cord shall beclosely wound three times under atension of 0.5 kg on a 25 mmdiameter mandrel. The mandrelshall be conditioned with thespecimen. A suitable method isdescribed in Annex B.


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TESTNO


9.11 TOXICITYINDEX

Specimens shall be subjected toDEF STAN 61-12 (Part 0) Clause13.43.

The maximum value oftoxicity index expressedin terms of 100g ofmaterial shall be 2.

9.12 RESISTANCETO FLUIDS

Specimens shall be subjected toDEF STAN 61-12 (Part 31)

No splitting, softening ordeterioration of thematerial and no greaterthan 20% reduction intensile strength thanuntreated material.

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Section Four. Tape Lacing

10 Test Details for Tape Lacing

10.1 Tape lacing shall meet the requirements of Mil Spec Mil-T-43435.

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Section Five. Tape Lacing Limited Fire Hazard

11 Test Details for Tape Lacing Limited Fire Hazard

Tape lacing limited fire hazard shall meet the requirements of Mil Spec Mil-T-43435 with thefollowing additional tests.

11.1 Halogen. Specimens shall meet the requirements of 9.9of this Standard.

11.2 Smoke index. Specimens shall meet the requirements of 9.10of this Standard.

11.3 Toxicity index. Specimens shall meet the requirements of 9.11of this Standard.

11.4 Resistance to fluids. Specimens shall meet the requirements of 9.12of this Standard.

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TABLE I

STANDARD RANGE

CORD, LACING AND TAPE LACING INCLUDING LIMITED FIRE HAZARDVARIANTS

PAGEITEM

NO

NATOSTOCK

NUMBER4020-99-

ITEM NAME DESCRIPTION

NOMINALDIAMETER

COLOUR WORKINGTEMPERATURERANGE

MM C

(a) (e) (f) (g) (h)

1

2

3

4

011-9481

014-2488

-

-

Cord, Lacing

Cord, Lacing

Cord, Lacing (LFH)

Tape, Lacing (LFH)

1.0

0.8

1.0

1.0

Black

Black

Black

Black

-40 to 85

-40 to 85

-40 to 150

-40 to 150

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A-1

ANNEX A

LOCKING KNOT

DIRECTION OF LACING

THIS IS THE ACCEPTED METHOD OF LACING CABLE FORMS ETC

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A-2

Collation Page

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DEF STAN 40-8/3ANNEX B

B-1

ANNEX B

MANDREL BOX FOR FLEXIBILITY TESTS

FLEXIBILITY - TEST METHOD

The appropriate mandrel shall be mounted in an insulated box provided with a removable lidand a thermometer to indicate the temperature inside the box. The mandrel must be providedwith an external drive so that it can be rotated without opening the box. The test specimensupporting a 0.5 kg mass at its free end shall be attached to the mandrel. The box with its lidopen shall then be subjected to the appropriate test condition as specified in 8.4.1and 8.4.2.

At the end of the conditioning period the lid will be closed and the thermometer reading shallbe within 2C of the test temperature. While at this temperature, the mandrel is to berotated at approximately one revolution per second for three complete revolutions.

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B-2

Collation Page

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Procurement Executive, Ministry of DefenceDirectorate of Standardization

Room 1138, Kentigern House, 65 Brown Street, GLASGOW, G2 8EX

Telephone: 0141-224 2595 (Direct Dialling) Fax: 0141-224 2503

0141-248 7890 (Switchboard)

Internet e-mail address: [email protected]

Your Reference :

Our Reference : D/DStan/11/2

Date : 9 November 1998

Removal of Product Qualification Approval

IMPORTANT ANNOUNCEMENT

1. This Standard contains a Product Qualification Approval (PQA) scheme.iMOD policy requires that all

PQA schemes are removed from Defence Standards called up in contracts placed after 1stJanuary 1998.

2. Users of this Standard are to contact the Project Manager (PM), Equipment Support Manager (ESM) or

Technical Service Authority (TSA) named in the contract or order, to identify whether there is a continuing need

for an approvals scheme.

3.iiProduct Conformity Certification (PCC) is a risk based process that replaces PQA. Once a risk has been

identified PCC can be included as a contract clause. In exceptional circumstances agreement can be sought from

AD/Stan for PCC to be included in a Defence Standard.

4. At the next revision of this Standard the PQA scheme will be removed.

T R Leaver

Head of Standards Programme Management

Tel: 0141 224 2595 FAX: 0141 224 2503

iDefence Council Instruction (General) 197/97; Quality Temporary Memorandum 5/98; Chief ofDefence Procurement Instruction CDPI/TECH/250 (draft)iiPCC is certification that a product meets its specification. When PC is required by the contract, the

contractor is responsible for obtaining the necessary PCC. Certification shall be provided from aNAMAS accredited laboratory when appropriate. PCC shall apply where a Risk Assessment has beenidentified by the PM; ESM or TSA.