NZQA Expiring unit standard
8403 version 9
Page 1 of 4
Title
Demonstrate knowledge of chrome leather wet post tannage
processes
Level
4
Purpose
Credits
6
This unit standard is for people new to the leather industry or
those wishing to develop their technical skills in leather
manufacture.
People credited with this unit standard are able to demonstrate
knowledge of: wet post tannage stages; mechanism of chrome
leather neutralisation and chemicals used in dyeing,
fatliquoring, and retanning; chrome leather wet post tannage
methods; and dyed chrome leather product properties.
Classification
Leather Manufacturing > Leather Manufacture Technology
Available grade
Achieved and Merit
Explanatory notes
Version 3 of this unit standard introduced criteria for merit. Wherever a merit requirement
appears in this unit standard it assumes that the requirements for credit have been met.
Outcomes and evidence requirements
This unit standard is
Demonstrate knowledge of wet post tannage stages.
expiring
Evidence requirements
Outcome 1
1.1
Wet post tannage stages are described in correct sequence in terms of their
purpose in achieving specified finished leather properties.
Range
1.2
neutralisation, dyeing, retanning, fatliquoring.
Wet post tannage machinery is described in terms of mechanical principle and
function.
Credit
Merit
a process vessel plus two others, which may include any of –
sammer, splitter, shaver, setter, wet wheeler.
plus one other.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8403 version 9
Page 2 of 4
Outcome 2
Demonstrate knowledge of mechanism of chrome leather neutralisation and chemicals
used in dyeing, fatliquoring, and retanning.
Evidence requirements
2.1
Chrome leather neutralisation is described in terms of chemical mechanism.
2.2
Chrome leather dyestuffs are described by type and their properties that
influence finished leather.
Credit
Merit
2.3
Chrome leather fatliquoring agents are described by type and their properties
that influence finished leather.
Credit
Merit
2.4
three, which may include but are not limited to any of – acid, basic,
direct, premetallised.
plus one other.
three, which may include but are not limited to any of – cationic,
amphoteric, sulphated, sulphited, sulphonated.
plus one other.
Chrome leather retanning agents are described by type and their properties that
influence finished leather.
Credit
Merit
three, which may include but are not limited to any of – syntans,
vegetable tans, acrylic resins, mineral tans, aldehydes.
plus one other.
Outcome 3
This unit standard is
Evidence requirements
expiring
3.1
Neutralisation, retanning, dyeing and fatliquoring techniques are described in
Demonstrate knowledge of chrome leather wet post tannage methods.
terms of their use in manufacturing different leather types.
Credit
Merit
3.2
Factors that influence dye levelness are described in relation to chrome leather
wet post tannage methods.
Credit
Merit
3.3
one of the following – upper, clothing, gloving, upholstery.
plus one other.
four of the following – levelling agents, hide and skin uniformity,
dyestuff properties, temperature, pH, float, mechanical action,
process control.
plus two others.
An alternative to the drum or paddle process for dyeing chrome leather is
described and its advantages and disadvantages explained.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8403 version 9
Page 3 of 4
Outcome 4
Demonstrate knowledge of dyed chrome leather product properties.
Evidence requirements
4.1
Dyed chrome leather product properties are described in relation to their
suitability for leather product uses.
four, which may include but are not limited to any of – light
fastness, rub fastness, wash fastness, perspiration fastness, dry
cleanability, strength, stretch, softness.
plus two others.
Credit
Merit
Replacement information
This unit standard has been replaced by unit standard
27900.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
24 September 1996
31 December 2015
Revision
2
16 September 1997
31 December 2015
Review
3
27 April 2000
31 December 2015
Revision
This
unit standard
is
5
14 October 2004
31 December 2015
6
14 December 2007
31 December 2015
expiring
7
21 February 2013
31 December 2015
4
20 February 2002
31 December 2015
Rollover
8
20 March 2015
31 December 2017
Rollover
9
17 September 2015
31 December 2018
Revision
Review
Review
Consent and Moderation Requirements (CMR) reference
0185
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8403 version 9
Page 4 of 4
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
This unit standard is
expiring
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016