INTERNATIONAL ISO

STANDARD 6123-2

Third edition
2015-12-01

Rubber or plastics covered rollers —

Specifications —
Part 2:
Surface characteristics
Cylindres revêtus de caoutchouc ou de plastique — Spécifications —
Partie 2: Caractéristiques
iTeh STANDARD PREVIEWde surface

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ISO 6123-2:2015
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Reference number
ISO 6123-2:2015(E)

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ISO 6123-2:2015(E)


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ISO 6123-2:2015
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Contents Page

Foreword......................................................................................................................................................................................................................................... iv
Introduction...................................................................................................................................................................................................................................v
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 1
4 Surface quality......................................................................................................................................................................................................... 2
4.1 General............................................................................................................................................................................................................ 2
4.2 Grades.............................................................................................................................................................................................................. 2
5 Surface finish............................................................................................................................................................................................................. 3
5.1 Methods of surface treatment — Terms and classification............................................................................... 3
5.2 Description by surface treatment — Types.................................................................................................................... 3
5.2.1 Type 1 — Polished finish........................................................................................................................................... 3
5.2.2 Type 2 — Fine grinding finish............................................................................................................................... 3
5.2.3 Type 3 — Standard grinding finish................................................................................................................... 3
5.2.4 Type 4 — Turned finish.............................................................................................................................................. 3
5.2.5 Type 5 — Unground finish....................................................................................................................................... 4
5.2.6 Type S — Special treatment.................................................................................................................................... 4
5.3 Characterization by surface roughness.............................................................................................................................. 4
5.3.1 Requirement......................................................................................................................................................................... 4
5.3.2 iTeh STANDARD PREVIEW
Method of testing.............................................................................................................................................................. 4
5.3.3 Expression of results..................................................................................................................................................... 6
5.3.4
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Repeatability and reproducibility...................................................................................................................... 6
Annex A (informative) Relation betweenISO surface treatment and surface roughness........................................ 7
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
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Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
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The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
ISO 6123-2:2015
This third edition cancels and replaces the second edition (ISO 6123-2:1988), of which it constitutes a
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minor revision to update the normative references.
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ISO 6123 consists of the following parts, under the general title Rubber or plastics covered rollers —
Specifications:
— Part 1: Requirements for hardness
— Part 2: Surface characteristics
— Part 3: Dimensional tolerances

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Introduction
Covered rollers are cylindrical cores, generally of metal, with a cover of rubber or plastics or a particular
use. They are manufactured in a wide variety of sizes and hardness grades depending on the intended use.

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INTERNATIONAL STANDARD ISO 6123-2:2015(E)

Rubber or plastics covered rollers — Specifications —

Part 2:
Surface characteristics

1 Scope
This part of ISO 6123 establishes a classification of rubber or plastics covered rollers according to
surface quality or imperfections and surface finish. A test method for the determination of surface
roughness is also described.

2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3274, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Nominal
characteristics of contact (stylus) instruments
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ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and
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procedures for the assessment of surface texture
ISO 23529, Rubber — General procedures for ISOpreparing
6123-2:2015and conditioning test pieces for physical test methods
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
arithmetical mean deviation of the profile
Ra
arithmetical mean of the absolute values of the profile departures within the sampling length, l

l n
1 1
Ra =
l ∫0 y x dx or approximately R a ≈ ∑ y
n i =1 i
where n is the number of discrete profile deviations.
Note 1 to entry: The values of Ra in practice are determined within the evaluation length which includes several
sampling lengths. According to ISO 3274, the sampling length is equal to the cut-off.

3.2
ten point height of irregularities
Rz
average value of the absolute values of the heights of five highest profile peaks and the depths of five
deepest profile valleys within the sampling length
5 5
∑ ypi + ∑ y v i
Rz = i =1 i =1
5

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where

ypi is the height of the ith highest peak profile;

y vi is the depth of the ith deepest profile valley.

Note 1 to entry: Depending on the shape of the profile, in certain cases, a problem arises associated with the lack
of a number of profile peaks and valleys and/or the super-imposing of waviness on the roughness.

4 Surface quality

4.1 General
The manufacturing process and the raw materials used in the manufacture of rubber or plastics
covered rollers may cause sporadic imperfections, in the form of holes and foreign matter, in the surface
of the roller covers. The number, size and location of permissible surface imperfections shall be agreed
between the interested parties.
The type of surface finish (see Clause 5) shall be observed when selecting the grade of imperfections.

4.2 Grades
The rollers may be graded according to the permissible numbers and sizes of imperfections as follows:
Grade x/y iTeh STANDARD PREVIEW
This means that (standards.iteh.ai)
— imperfections up to and including x mm2 in area are acceptable;
ISO 6123-2:2015
— not more than two imperfections each having an area between x mm2 and y mm2 inclusive are
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permissible in any 0,1 m2 of cover area; 84cf302ca26d/iso-6123-2-2015
— roller covers showing imperfections larger than y mm2 in area shall be rejected.
The values of x and y shall be agreed between the interested parties.
If no requirements for surface quality are necessary, the rollers shall be designated “grade N”.
EXAMPLE    A medium grade of surface quality can be described by the designation:
Grade 0,5/2
This means that
— imperfections up to and including 0,5 mm2 in area are acceptable;
— not more than two imperfections each having an area be tween 0,5 mm2 and 2 mm2 inclusive are
permissible in any 0,1 m2 of cover area;
— roller covers showing imperfections larger than 2 mm2 in area shall be rejected.
If agreement between the interested parties, or special provisions in national standard, are intended,
the required quality should be chosen from the grades given below:
— grade 0,1/0,3
— grade 0,3/1
— grade 0,5/2
— grade 2/5

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— grade 5/10
— grade N

5 Surface finish
The surface finish of a roller cover is dictated by the intended use. It shall be characterized either as a
type of surface treatment (see 5.1) or as the maximum value of surface roughness (see 5.3), as agreed
between the interested parties.

5.1 Methods of surface treatment — Terms and classification

Table 1 shows the generally employed principal methods of surface treatment, by means of which the
roller surfaces are classified (see 5.2). The type of surface finish, and the structure or texture which can
be achieved, are dependent upon the hardness and composition of the roller cover.

Table 1 — Surface finishes

Type Surface treatment Sequence of treatment
1 Polishing ↑
2 Grinding, fine ↑
3 Grinding, standard ↑
4 iTeh STANDARD PREVIEW
Turning ↑
5 Unground finish ↑
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5.2 Description by surface treatment — Types
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The surface structures described for Types 1 to 4 are produced by regular treatments and have a
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roughness without preferential direction.
The type required shall be chosen by agreement between the interested parties.

5.2.1 Type 1 — Polished finish

In soft elastomers, the surface is velvet-like; in hard rubber (ebonite) or plastics, it is smooth.
Grinding marks and scratches shall not be visible to the naked eye. Sporadic grinding blemishes are
permissible. Not all qualities permit this finish.

5.2.2 Type 2 — Fine grinding finish

Slight grinding and feed marks are visible to the naked eye, but are not noticeable when touching the
roller.

5.2.3 Type 3 — Standard grinding finish

Grinding marks and grinding feed are visible and just noticeable when touching the roller.

5.2.4 Type 4 — Turned finish

The surface is solely turned, with as little feed of the turning tool as practicable. Turning grooves are
visible and noticeable when touching the roller.

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