ISO/IEC 13962:1995
(Main)Information technology — Data interchange on 12,7 mm, 112-track magnetic tape cartridges — DLT 2 format
Information technology — Data interchange on 12,7 mm, 112-track magnetic tape cartridges — DLT 2 format
Specifies the physical and magnetic characteristics of a 12,7 mm wide, 112-track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format - called Digital Linear Tape 2 (DLT2) - and a recording method. Together with a labelling standard, e.g. ISO 1001, it allows full data interchange by means of such magnetic tape cartridges.
Technologies de l'information — Échange de données sur cartouches de bande magnétique de 12,7 mm, 112 pistes — Format DLT 2
General Information
Standards Content (Sample)
INTERNATIONAL ISOIIEC
STANDARD
13962
First edition
1995-09-15
Information technology - Data
interchange on 12,7 mm, 112~track
magnetic tape cartridges - DLT 2 format
Technologies de I’informa tion - khange de donnees SW cartouches de
bande magn&ique de 12,7 mm, 112 pistes - Format DLT 2
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ISOLIEC 13962: 1995 (E)
Contents
Page
1 Scope
2 Conformance
2.1 Magnetit tape cartridges
2.2 Generating Systems
2.3 Receiving Systems
3 Normative references
4 Definitions
1
4.1 Average Signal Amplitude
1
4.2 azimuth
1
4.3 back surface
1
4.4 Beginning-Of-Tape marker (BOT)
1
4.5 byte
2
4.6 cartridge
2
4.7 Cyclic Redundancy Check (CRC) Character
2
4.8 Early Wart-ring (EW)
2
4.9 Error-Detecting Code (EDC)
2
4.10 End-Of-Tape marker (EOT)
2
4.11 Entity
2
4.12 Error-Correcting Code (ECC)
2
4.13 flux transition Position
2
4.14 flux transition spacing
2
4.15 Logical Block
2
4.16 logical track
2
4.17 magnetic tape
2
4.18 Master Standard Reference Tape
2
4.19 Object
2
4.20 physical block
2
4.21 physical recording density
2
4.22 physical track
2
4.23 Record
2
4.24 Reference Edge
2
4.25 Reference Field
2
4.26 Secondary Standard Reference Tape
@ ISO/IEC 1995
All rights reserved. Unless otherwise specified no part of this publication may be
reproduced or utilized in any form or by any means, electronie or mechanical,
including photocopying and microfilm, without Permission in writing from the publisher
ISO/IEC Copyright Office l Case Postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
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ISO/IEC 13692:1995 (E)
OISO/IEC
4.27 Standard Reference Amplitude (SRA)
4.28 Standard Reference Current
4.29 Test Recording Current
4.30 Typical Field
5 Conventions and notations
5.1 Representation of numbers
5.2 Names
5.3 Acronyms
3
6 Environment and safety
3
6.1 Cartridge and tape testing environment
4
6.2 Cartridge operating environment
4
6.3 Cartridge storage environment
4
6.4 Safety
4
6.4.1 Safeness
4
6.4.2 Flammability
4
6.5 Transportation
Section 2 - Requirements for the unrecorded tape
7 Mechanical and electrical requirements
7.1 Material
7.2 Tape length
7.3 Width
7.4 Total thickness
7.5 Thickness of the base material
7.6 Thickness of the magnetic coating
7.7 Thickness of the back coating
7.8 Discontinuity
7.9 Longitudinal curvature
7.9.1 Requirement
7.9.2 Procedure
5
7.10 Out-of-Plane distortions
5
7.11 Cupping
6
7.12 Roughness of the coating surfaces
6
7.12.1 Roughness of the back coating surface
6
7.12.2 Roughness of the magnetic coating surface
6
7.13 Coating adhesion
7
7.14 Layer-to-layer adhesion
7
7.14.1 Requirements
7
7.14.2 Procedure
8
7.15 Modulus of elasticity
8
7.15.1 Requirement
8
7.15.2 Procedure
8
7.16 Flexural rigidity
. . .
111
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OISOIIEC
ISO/IEC 13962: 1995 (E)
8
7.16.1 Requirement
8
7.16.2 Procedure
9
7.17 Tensile yield forte
9
7.17.1 Procedure
9
7.18 Electrical resistance
9
7.18.1 Requirement
9
7.18.2 Procedure
10
7.19 Inhibitor tape
10
7.20 Abrasivity
10
7.20.1 Requirement
10
7.20.2 Procedure
10
7.21 Light transmittance of the tape and the leader
10
7.22 Coefficient of dynamic friction
10
7.22.1 Requirements
11
7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface
7.22.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and Calcium
11
titanate ceramic
11
8 Magnetit recording characteristics
11
8.1 Typical Field
12
8.2 Signal amplitude
12
8.3 Resolution
12
8.4 Overwrite
12
8.4.1 Requirement
12
8.5 Peak shift
12
8.5.1 Requirement
12
8.5.2 Procedure
13
9 Tape quality
13
9.1 Missing pulses
13
9.1.1 Requirement
13
9.2 Missing pulse zone
13
9.2.1 Requirement
13
9.3 Tape durability
14
Section 3 - Mechanical specifications of the tape cartridge
14
10 General
14
10.1 Bottom side and right side
15
10.2 Back side and left side
16
10.3 Tape reel
16
10.4 Tape leader
18
10.5 Front side
18
10.6 Operation of the cartridge
19
10.7 Tape winding
1v
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ISO/IEC 13692:1995 (E)
OISOIIEC
19
10.8 Moment of inertia
19
10.9 Material
28
Section 4 - Requirements for an interchanged tape
28
11 Method of recording
28
11.1 Physical recording density
28
11.2 Bit cell length
28
11.2.1 Average bit cell length
28
11.2.2 Long-term average bit cell length
28
11.2.3 Short-term average bit cell length
28
11.3 Flux transition spacing
28
11.4 Read Signal amplitude
28
11.5 Azimuth
28
11.6 Channel skew
29
12 Tape format
29
12.1 Reference Edge
29
12.2 Direction of recording
29
12.3 Tape layout
29
12.4 Calibration and Directory Area
30
12.4.1 Scratch Area
30
12.4.2 Guard Area Gl
30
12.4.3 Calibration Tracks Area
31
12.4.4 Guard Area G2
31
12.4.5 Directory Area
31
12.4.6 Guard Area G3
31
12.5 Data Area
32
12.5.1 Physical tracks
32
12.5.2 Width of the physical tracks
32
12.5.3 Logical tracks
32
12.5.4 Locations of the physical tracks
35
12.5.5 Layout of tracks in the Data Area
36
13 Data format
36
13.1 Data Bytes
36
13.2 Logical Blocks
36
13.3 Data Blocks
36
13.4 Types of Logical Blocks
37
13.5 Entities
37
13.6 Logical Block format
37
13.6.1 Preamble
37
13.6.2 Sync
37
13.6.3 Data Field
38
13.6.4 Control Field 1 (CF1 )
40
13.6.5 Control Field 2 (CF2)
41
13.6.6 CRC
41
13.6.7 Postamble
V
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OISO/IEC
ISO/IEC 13962: 1995 (E)
41
14 Use of Logical Blocks
41
14.1 Data Blocks
41
14.2 Tape Mark Blocks
41
14.3 Filler Blocks
41
14.4 End of Track Blocks (EOTR)
41
14.5 End of Data Blocks (EOD)
41
14.6 ECC Blocks
42
15 Format of Entities
42
16 Error handling
43
Annexes
43
A - Measurement of light transmittance
46
B - CRC generation
47
C - ECC generation
50
D - Format of Control Field 1
51
E - Format of Control Field 2
52
F - Recommendations for transportation
53
G - Inhibitor tape
54
H - Recommendations on tape durability
55
J - Handling guidelines
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OISO/IEC
ISO/IEC 13692:1995 (E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the
specialized System for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in Felds of mutual interest. Other
international organizations, governmental and non-govemmental, in liaison with ISO and IEC, also take part in the work.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
International Standard ISO/IEC 13962 was prepared by ECMA (as Standard ECMA-197) and was adopted, under a special
“fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
Annexes A to E form an integral part of this International Standard. Annexes F to J are for information only.
vii
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ISO/IEC 13962: 1995 (E)
OISO/IEC
Introduction
ISO/IEC 13421 l) specifies a magnetic tape cartridge in which the 12,7 mm wide magnetic tape is recorded on 48 parallel
physical tracks, recorded and read in pairs, which constitute two groups, the first recorded and read in forward direction, the
second in reverse direction.
This International Standard constitutes a further development of the cartridge specified in ISO/IEC 13421 in that the number
of tracks has been raised from 48 to 112, thus raising the total capacity of the cartridge accordingly. Drives for cartridges
according to this International Standard may be able to read from, and write onto, cartridges according to ISO/IEC 13421.
l) ISOIIEC 13421.1993 . Information technology - Data interchange on 12,7 mm, 48-track magnetic tape cartridges - DLTI
7
format.
. . .
Vlll
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INTERNATIONAL STANDARD @ISO/IEC
ISOIIEC 13962:1995 (E)
Information technology - Data interchange on 12,7 mm, 112~track magnetic tape
cartridges - DLT 2 format
Section 1 - General
1
Scope
This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 112-track magnetic tape
cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded Signals, a format - called
Digital Linear Tape 2 (DLT 2) - and a recording method. Together with a labelling Standard, e.g. ISO 1001, it allows full data
interchange by means of such magnetic tape cartridges.
2 Conformance
21 0 Magnetit tape cartridges
A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of
this International Standard. The tape requirements shall be satisfied throughout the extent of the tape.
22 . Generating Systems
A System generating a magnetic tape cartridge for interchange shall be entitled to Claim conformance with this International
Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International
Standard.
23 . Receiving Systems
A System receiving a magnetic tape cartridge for interchange shall be entitled to Claim conformance with this International
Standard if it is able to handle any recording made on a tape according to 2.1.
3 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this International
Standard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to
agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
editions of the Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information interchange.
ISO 1302: 1992, Technical drawings - Method of indicating sur$ace texture.
4 Definitions
For the purpose of this International Standard, the following definitions apply.
41 0 Average Signal Amplitude: The average peak-to-peak value of the output Signal from the read head at the
physical recording density of 1 674 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses.
42 . azimuth: The angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track
from the line normal to the Reference Edge.
43 . back surface: The surface of the tape opposite the magnetic coating which is used to record data.
44 . Beginning-Of-Tape marker (BOT): A hole punched on the centreline of the tape towards the end nearest to the
leader.
45 . byte: An ordered set of bits acted upon as a unit.
Note 1 - In this International Standard, all bytes are 8-bit bytes.
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ISO/IEC 13962: 1995 (E) OISO/IEC
46 . cartridge: A case containing a Single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer
end.
Character: A 64-bit Character, generated by a mathematical computation,
47 . Cvclic Redundancv Check (CRC)
d
used for error detection.
generated by the drive indicating the approaching end of the recording area.
48 . Early Warning (EW): A Signal
49 0 Error-Detecting Code (EDC): A mathematical computation yielding check bytes used for error detection.
A hole punched on the centreline of the tape towards the end farthest from the
4.10 End-Of-Tape marker (EOT):
leader.
4.11 Entity: A group of ten Logical Blocks treated as a logical unit and recorded on a logical track.
4.12 Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction of
errors detected by the CRC and the EDC.
4.13 flux transition Position: The Point which exhibits the maximum free-space flux density normal to the tape
surface.
4.14 flux transition spacing: The distance on the magnetic tape between successive flux transitions.
4.15 Logical Block: The two physical blocks simultaneously written on, or read from, the two physical tracks of a
logical track.
4.16 logical track: A pair of physical tracks that are written or read simultaneously.
4.17 magnetic tape: A tape that accepts and retains magnetic Signals intended for input, output, and storage purposes on
Computers and associated equipment.
4.18 Master Standard Reference Tape: A tape selected as the Standard for reference field, Signal amplitude,
resolution, peakshift, and overwrite characteristics.
Note 2 - The Master Standard Reference Tape is maintained by the Quantum Corporation.
4.19 Object: A Record or a Tape Mark Block.
4.20 physical block: A set of contiguous bytes recorded on a physical track and considered as a unit.
4.21 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.22 physical track: A longitudinal area on the tape along which a series of magnetic Signals tan be recorded.
4.23 Record: A collection of User Bytes, the number of which is determined by the host.
4.24 Reference Edge: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the
left and the EOT to the right of the observer.
4.25 Reference Field: The Typical Field of the Master Standard Reference Tape.
4.26 Secondary Standard Reference Tape : A tape the characteristics of which are known and stated in relation to
those of the Master Standard Reference Tape.
334 South
Note 3 - Secondary Standard Reference Tapes tan be ordered under Reference “SSRT/DLTl” until the year 2003 from Quantum Corporation,
Street, Shrewsbury, Mass. 01545, USA.
It is intended that these be used for calibrating tertiary reference tapes for routine calibration.
4.27 Standard Reference Amplitude (SRA): The A verage Signal Amplitude from the Master Standard Reference
Tape when it is recorded with the Test Recording Current at 1 674 ftpmm.
4.28 Standard Reference Current: The current that produces the Reference Field.
2
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OISO/IEC ISO/IEC 13962: 1995 (E)
4.29 Test Recording Current: The current that is 1 ,l times the Standard Reference Current.
4.30 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the physical recording
density of 1674 ftpmm, the minimum field that Causes an Average Signal Amplitude equal to 95 % of the maximum Average
Signal Amplitude.
5 Conventions and notations
51 0 Representation of numbers
The following conventions and notations apply in this International Standard, unless otherwise stated.
- In each block and in each field the bytes shall be arranged with Byte 1, the least significant, first. Within each byte the bits
shall be arranged with Bit 1, the least significant, first and Bit 8, the most significant bit, last. This Order applies to the data,
and to the input and output of the error-detecting and error-correcting Codes, and to the cyclic redundancy characters.
- Letters and digits in parentheses represent numbers in hexadecimal notation.
- The setting of bits is denoted by ZERO or ONE.
- Numbers in binary notation and bit Patterns are represented by strings of ZEROS and ONEs shown with the most
significant bit to the left.
52 l Names
fields, are written with a capital initial letter.
The names of basic elements, e.g. specific
53 . Acronyms
BOT Beginning of Tape
CF1 Control Field 1
CF2 Control Field 2
CRC Cyclic Redundancy Check (Character)
ECC Error-Correcting Code
EDC Error-Detecting Code
End of Data
EOD
EOT End of Tape
EOTR End of Track
EW Early Warning
FCTl Forward Calibration Track 1
FCT2 Forward Calibration Track 2
LEOT Logical End of Track
MFM Modified Frequency Modulation
RCTl Reverse Calibration Track 1
RCT2 Reverse Calibration Track 2
SRA Standard Reference Amplitude
6 Environment and safety
Computer room and not to
Unless otherwise stated, the conditions specified below refer to the ambient conditions in the test or
those within the tape drive.
61 . Cartridge and tape testing environment
requirements of this International
stated, tests and measurements made on the cartridge and tape to check the
Unless otherwise
Standard shall be carried out under the following conditions:
23 “C + 2 “C
- temperature:
-
relative humidity: 40 % to 60 %
-
conditioning before testing: 24 h
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ISO/IEC 13962: 1995 (E) OISOIIEC
62 . Cartridge operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions:
- temperature: 10 “C to 40 “C
-
relative humidity: 20 % to 80 %
-
wet bulb temperature: 25 “C max.
Note 4 - Localized tape temperatures in excess of 49 “C may Cause tape darnage.
If during storage andlor transportation a cartridge has been exposed to conditions outside the above values, it shall be
conditioned before use by exposure to the operating environment for a time equal to, or greater than, the time away from the
operating environment up to a maximum of 2 h. There shall be no deposit of moisture on or in the cartridge.
63 . Cartridge storage environment
Cartridges shall be stored under the following conditions:
- temperature: 16 “C to 32 “C
-
relative humidity: 20 % to 80 %
-
wet bulb temperature: 26 “C max.
Tapes intended for archiving data for one year or more shall be stored under the following conditions:
- temperature:
18”Cto26”C
-
relative humidity: 20 % to 60 %
The stray magnetic field at any Point on the tape shall not exceed 4000 A/m. There shall be no deposit of moisture on or in the
cartridge.
. Safety
64
6.4.1 Safeness
The cartridge and its components shall not constitute any safety or health hazard when used in the intended manner, or through
foreseeable misuse in an information processing System.
anY
Flammability
6.4.2
The cartridge and its components shall be made from materials which, if ignited from a match flame, and when so ignited do
not continue to bum in a still carbon dioxide atmosphere.
6.5 Transportation
for the environment in which cartridges should be transported. Annex
This International Standard does not specify Parameters
F gives some recommendations for transportation.
4
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OISO/IEC ISO/IEC 13962:1995 (E)
Section 2 - Requirements for the unrecorded tape
7 Mechanical and electrical requirements
71 l Material
The tape shall consist of a base material (oriented polyethylene terephthalate film or its equivalent) coated on one surface with
a strong yet flexible layer of ferromagnetic material dispersed in a suitable binder. The other surface of the cartridge shall be
coated with a non-ferromagnetic conductive coating.
72 . Tape length
The length of the tape shall be 355 m minimum and 365 m maximum.
73 . Width
The width of the tape shall be 12,649 mm t 0,010 mm.
The width shall be measured across the tape from edge to edge when the tape is under a tension of less than 0,28 N.
74 . Total thickness
The total thickness of the tape at any Point shall be between 12,0 Pm and 14,0 km.
75 . Thickness of the base material
The thickness of the base material shall be between 9,0 Pm and 11 ,O Fm.
76 . Thickness of the magnetic coating
The thickness of the magnetic coating shall be between 2,0 Pm and 3,0 Pm.
77 . Thickness of the back coating
The thickness of the back coating shall be between 0,4 Pm and 0,9 Pm.
78 l Discontinuity
There shall be no discontinuities in the tape between the BOT and EOT such as those produced by tape splicing or
perforations.
.
79 . Longitudinal curvature
The longitudinal curvature is measured as the departure of the Reference Edge of the tape from a straight line along the
longitudinal dimension of the tape in the plane of the tape surface.
7.9.1 Requirement
Any deviation of the Reference Edge from a straight line shall be continuous and shall not exceed 0,038 mm within any 229
mm length of tape.
Procedure
7.9.2
Measure at a tension of 1,39 N t 0,28 N in a test fixture equipped with two guides spaced at 229 mm. The two guides shall be
spring-loaded to Position the Reference Edge of the tape against two edge control surfaces. Measure the maximum deviation
of the Reference Edge of the tape from the line drawn between the two control surfaces.
7.10 Out-of-Plane distortions
All visual evidente of out-of-plane distortion shall be removed when the tape is subjected to a uniform tension of 0,6 N. Out-
of-plane distortions are local deformations which Cause portions of the tape to deviate from the plane of the surface of the tape.
Out-of-plane distortions are most readily observed when the tape is lying on a flat surface under no tension.
7.11 Cupping
The departure across the width of the tape from a flat surface shall not exceed 0,76 mm.
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ISO/IEC 13962: 1995 (E) OISO/IEC
Cut a 1 ,O m t 0,l m length of tape. Condition it for a minimum of 3 hours in the test environment by hanging it so that both
surfaces are freely exposed to the test environment. From the centre Portion of the conditioned tape tut a test piece of
approximately 25 mm length. Stand the test piece on its end in a cylinder which is at least 25 mm high with an inside diameter
of 13,O mm t 0,2 mm. With the cylinder standing on an Optical comparator measure the cupping by aligning the edges of the
test piece to the reticle and determining the distance from the aligned edges to the corresponding surface of the test piece at its
centre.
7.12 Roughness of the coating surfaces
7.12.1 Roughness of the back coating surface
The back coating surface shall have an arithmetic average roughness Ra between 0,005 Pm and 0,025 Fm (ISO 1302:N 2).
This measurement shall be made using a contacting stylus of radius 12,5 Pm with a 20 mg load, and a 254 p cutoff range.
7.12.2 Roughness of the magnetic coating surface
The magnetic coating surface shall have an arithmetic average roughness Ra between 0,005 0 Pm and 0,012 5 Fm (ISO 1302:
N 3). For this measurement, the contacting stylus radius shall be 12,5 Fm with a 20 mg load, and a 254 Fm cutoff range.
7.13 Coating adhesion
The forte required to peel any part of the coating from the tape base material shall not be less than 0,2 N.
Procedure
i. Take a test piece of the tape approximately 380 mm long and scribe a line through the recording coating across the width
of the tape 125 mm from one end.
ii. Using a double-sided pressure sensitive tape, attach the full width of the test piece to a smooth metal plate, with the
magnetic coating (recording surface) facing the plate, as shown in figure 1.
iii. Fold the test piece over 180”, attach the metal plate and the free end of the test piece to the jaws of a universal testing
machine and set the Speed of the jaw Separation to 254 mm per min.
iv. Note the forte at which any part of the coating first separates from the base material. If this is less than 0,2 N, the test has
failed. If the test piece peels away from the double-sided pressure sensitive tape before the forte exceeds 0,2 N, an
alternative type of double-sided pressure sensitive tape shall be used.
v. Repeat i) to iv) for the back coating.
Recording surface Scribed line
1
Pressure-sensitive tape
------+
4------ 125 mm I
93-01204
Figure 1 - Measurement of the coating adhesion
6
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ISOiIEC 13962:1995 (E)
OISO/IEC
7.14 Layer-to-layer adhesion
Layer-to-layer adhesion refers to the tendency of a layer, when held in close proximity to the adjacent layer, to bond itself to
an adjacent layer so that free and smooth Separation of the layers is difficult.
7.14.1 Requirements
There shall be no evidente of delamination or other darnage to the coatings.
7.14.2 Procedure
i. Fasten one end of a 914 mm length of tape, magnetic coating inwards, to a horizontally mounted stainless steel cylinder
with a low cold-flow adhesive material.
ii. The dimensions of the cylinder shall be:
- diameter: 12,7 mm
- length: 102 mm
iii. Attach a mass of 1 000 g to the opposite end of the tape.
iv. Attach, 254 mm above the mass, a narrow strip of double-sided adhesive tape to the magnetic coating.
v. Slowly rotate the cylinder, so that the tape Winds uniformly around it into a compact and even roll. The double-sided tape
secures the end and prevents unwinding when the mass is removed.
vi. The cylinder with the tape shall then be exposed to the following temperature and humidity cycle:
Time Temperature RH
85 %
16hto18h 54 “C
10 % or less
4h 54 “C
21 “C 45 %
1 hto2h
vii. Open the end of the roll and remove the double-sided adhesive tape.
viii.Release the free end of the tape.
ix. The outer one or two wraps shall spring loose without adhesion.
x. Hold the free end of the tape and allow the cylinder to fall, thereby unwinding the tape.
xi. The tape shall show no coating delamination, except for the 5 1 mm of tape nearest to the cylinder.
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ISO/IEC 13962: 1995 (E) OISO/IEC
94-0085A
1000 g
Figure 2 - Measurement of layer-to-layer adhesion
7.15 Modulus of elasticity
The modulus of elasticity (Young’s modulus) is the ratio of stress to strain in the longitudinal direction.
7.151 Requirement
The modulus of elasticity shall be between 5 500 N/mm2 and 8 500 N/mm2.
7.152 Procedure
Clamp a test piece of tape at least 178 mm in length with an initial 102 mm Separation between the jaws of a universal testing
machine with a nominal crosshead Speed of 3 mm per minute. Calculate the modulus using the chord of the curve between the
forte at 0 % and 1 % elongation.
Flexural rigidity
7.16
Flexural rigidity is the ability of the tape to resist bending in the longitudinal direction.
7.16.1 Requirement
The flexural rigidity of the tape in the longitudinal direction shall be between 0,5 x 10W3 N - mm and 2,9 x 1 OV3 N - mm.
Procedure
7.16.2
Calculate the flexural rigidity D from the following
equation:
Ext3
--
-
D x (l-v2)
12
where:
E = modulus of elasticity obtained from 7.15
= measured thickness of the tape in mm
V = Poisson’s ratio, set to 0,33
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OISOIIEC ISO/IEC 13962: 1995 (E)
Tensile yield forte
7.17
The tensile yield forte required to elongate the test piece by 3 % shall not be less than 14,7 N.
7.17.1 Procedure
Use a static-weighing-constant-rate-of-grip Separation tester capable of indicating the load with an accuracy of 2 %. Clamp a
test piece of tape at least 178 mm long with an initial 102 mm Separation between the jaws. Elongate the test piece at a rate of
5 1 mm per minute until a minimum elongation of 10 % is reached. The forte required to produce an elongation of 3 % is the
tensile yield forte.
7.18 Electrical resistance
7.18.1 Requirement
The electrical resistance of any Square area of the magnetic coating shall
- be greater than 50 x 106 $92
- notexceed50x 1012R
The electrical resistance of any Square area of the back coating shall
- not exceed 100 x 106 Q
7.18.2 Procedure
Condition a test piece of tape in the test environment for 24 h. Position the test piece over two 24-carat gold-plated, semi-
circular electrodes having a radius Y = 25,4 mm and a finish of at least N4, so that the recording surface is in contact with each
electrode. These electrodes shall be placed parallel to the ground and parallel to each other at a distance d = 12,7 mm between
their centres. Apply a forte F of 1,62 N to each end of the test piece. Apply a d.c. voltage of 100 V t 10 V across the
current flow. From this value, determine the electical resistance.
electrodes and measure the resulting
Repeat for a total of 5 positions along the test piece and average the 5 resistance readings. For the back coating repeat the
procedure with the back surface in contact with the electrodes.
7
7
F F
9%0122-A
Figure 3 - Measurement of electrical resistance
When mounting the test piece, make sure that no conducting paths exist between the electrodes except that through the coating
under test.
Note 5 - Particular attention should be given to keeping the surf’aces clean.
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ISO/IEC 13962: 1995 (E) OISO/IEC
7.~9 Inhibitor tape
This International Standard does not specify Parameters for assessing whether or not a tape is an inhibitor tape. However,
annex G gives further information on inhibitor tapes.
7.20 Abrasivity
Tape abrasivity is the tendency of the magnetic coating to wear the magnetic heads.
7.20.1 Requirement
The depth of the wear Pattern in a ferrite wear bar shall be less than 1,27 um.
7.20.2 Procedure
A test piece 61 m in length shall be passed for 100 Passes (50 cycles) over a rectangular bar of manganese zinc ferrite. The bar
shall be 0,3 mm wide and its top surface shall be rounded off with a radius r. =
...
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