NZQA Expiring unit standard
8400 version 9
Page 1 of 3
Title
Demonstrate knowledge of vegetable tannage
Level
4
Purpose
Credits
8
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: vegetable tanning agents; mechanism of
vegetable tannage; vegetable tanning practice; and vegetable
tanned leather characteristics.
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
Outcome 1
This unit standard is
Evidence requirements
expiring
1.1
Vegetable tanning agents
are discussed in terms of their origins and leather
Demonstrate knowledge of vegetable tanning agents.
making properties.
Credit
Merit
mimosa plus two others, which may include but is not limited to –
quebracho, chestnut, myrabolams, valonia, sumach.
plus bisulphiting.
1.2
The key differences between condensed and hydrolysable tannins are
described in terms of their tanning properties.
1.3
The suitability of different vegetable tanning agents for specific leather types is
explained.
Credit
Merit
two of the following – sole leather, insole material, upholstery,
saddlery, case leather, belt, industrial leather.
plus one other.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8400 version 9
Page 2 of 3
Outcome 2
Demonstrate knowledge of mechanism of vegetable tannage.
Evidence requirements
2.1
Mechanism of vegetable tannage is described in terms of penetration and
subsequent fixation to skin.
Outcome 3
Demonstrate knowledge of vegetable tanning practice.
Evidence requirements
3.1
Process method for vegetable tannage is discussed in terms of procedure and
key principles.
Credit
Merit
3.2
one of the following – counter current pit system, combined
pit/drum method, rapid drum method.
plus one other.
Tannage control parameters are described in terms of vegetable tanning
practice.
Credit
Merit
three of the following – acidity, salt balance, tans to non-tans ratio,
tan strength, temperature, time, mechanical action.
plus two others.
Outcome 4
This unit standard is
Evidence requirements
expiring
4.1
Vegetable tanned leather is described in terms of chemical and physical
Demonstrate knowledge of vegetable tanned leather characteristics.
characteristics.
Credit
Merit
four of the following – anionic, thermal stability, shape retention,
substance, dyeability, water resistance, strength, stretch,
lightfastness, abrasion resistance.
plus two others.
Replacement information
This unit standard has been replaced by unit standard
27898.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8400 version 9
Page 3 of 3
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
4
20 February 2002
31 December 2015
Revision
5
14 October 2004
31 December 2015
Review
6
14 December 2007
31 December 2015
Review
7
21 February 2013
31 December 2015
Rollover
8
20 March 2015
31 December 2017
Rollover
9
17 September 2015
31 December 2018
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.
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.
This unit standard is
expiring
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016