Test methods for determining
the effectiveness of wood preservatives and their performance requirements
4.2
Termite proofing performance test
4.2.1
Indoor test
4.2.1.1
Injection treatment use
4.3.1.1.1
Material
a)
Wood piece The wood piece shall e as
follows:
1)
The wood piece shall be a
normal and sound crytomeria sapwood, and shall be taken from the same wood in
air dried state.
2)
The wood piece shall have
straight grain in two ways, and be finished smoothly and accurately by
planning.
3)
The number of annual rings
of wood piece shall be 3 to 5 per 10 mm, and the density, when dried , shall be
within the range between 0.25 g/cm3 and 0.32 g/cm3 .
4)
The shape of wood piece
shall be 20 mm x 20 mm at the end surface of lumber and 10 mm in height. The
dimensional tolerance of end surface of lumber and height shall be ± 0,5 mm.
5)
Dry the wood piece in a circulating
type dryer at 60 °C ± 2°C in temperature for 48 h, place it in a desiccator for
approximately 30 min as it is. then weigh the mass to the nearest 0.01 g and
store it in a desiccator so as not to be humidified.
b)
Test vermin The test vermin shall be Coptotermes (9)
Note(9): The Coptotermes, distributed in the west and
south of the Bobsoh
Peninsula
c)
Breeding container the breeding
container shall be prepared so that the dental stone specified in JIS T 6605 of approximately 5 mm in thickness
is hardened in a part of an acrylic resin cylinder of 80 mm in diameter and 60 mm
in height. This is placed in a container with a lid in which the moistured
cotton added with 130 ml to 150 ml of water to the absorbent cotton 100 g of
Japan Pharmacopoeia is previously spread all over by approximately 10 mm in
thickness. A small hole has been opened in the lid for ventilating.
4.3.1.1.2
Specimen The specimen shall be separated
into two classes such as a treated specimen and a non-treated specimen, and
shall be follows, respectively:
a)
Treated specimen The treated specimen
shall be as follows:
1)
Put the wood piece placed in a
beaker in a vacuum desiccator and others, depressurize it, recover to the
normal pressure as absorbing the sample, and leave it for a while as it is.
Then, take out the wood piece from the sample, wipe it lightly and immediately
weigh the mass to the nearest 0.01 g.
2)
Calculate the sample absorption
rate of wood piece according to formula (10), and round off the first decimal
place to make an integer.
m20 –m19
A3 = x 100……………………………..(10)
m19
Where, A3 : sample absorption
rate (%)
m19 : mass of wood piece
in 4.3.1.1.1 a) 5) (g)
m20 : mass of the treated
specimen in 4.3.1.1.2 a) 1) (g)
3)
Select to take the specified
number of treated samples of (250 ± 10) %
in sample absorption rate of wood piece for water soluble or emulsified sample
or (200 ± 10) % in sample absorption rate for oil based or oil soluble sample,
and leave it at a room temperature for 20 days or longer.
b)
Non-treated specimen The non-treated
specimen shall be the wood piece specified in 4.3.1.1.1 a) and used for the judgement of the activity of test
vermin in vermin damage operation.
c)
Number of specimens The number of
specimens shall be 5 in repetition number for both treated specimen and
non-treated specimen.
4.3.1.1.3
Test After the weathering operation is
carried out the vermin damage operation shall be carried out.
a)
Weathering operation Five pieces of each
specimen shall be taken as one set, and the others shall be in accordance with 4.2.1.1.3 a)
b)
Specimen with weathering operation finished Dry the specimen with weathering operation finished in a circulating
type dryer at 60 °C ± 2 °C for 48 h. Leave it in a desiccator for approximately
30 min as it is, and weigh the mass to the nearest 0.01 g
c)
Vermin damage operation The vermin
damage operation shall be as follows:
1)
Put the plastics net of the
approximately 1 mm in thickness on the dental stone in a breeding container
specified in 4.3.1.1.1 c) and put
one piece of specimen on it so that the end surfaces of lumber become upward
and downward.
2)
Take the termite specified in 4.3.1.1.1 b) from the nest at random,
and throw 150 worker termites and 15 soldier termites into one breeding
container.
3)
Place the breeding container
gently in a dark place at 28 °C ± 2 °C in temperature for 21 days. Remove the
dead termite during test period quickly from the container.
d)
Specimen with vermin damage operation finished After finishing of vermin damage operation, take out the specimen
from the breeding container, remove the adhered matter on the surface of
specimen sufficiently, dry it in air for approximately 24 h, then dry it in a
circulating type drier at 60 °C ± 2 °C in temperature for 48 h, leave it in a
desiccator for approximately 30 min as it is, and weigh the mass to the nearest
0.01 g.
4.3.1.1.4
Calculation The calculation shall be as
follows:
a) Mass
decrease rate The mass decrease rate of each specimen shall be calculated
according to formula (11), and the mean value shall be obtained, and made to an
integer by rounding off the first decimal place.
m21 – m22
L4 = x 100………………………………..(11)
m21
Where, L4 = mass decrease rate
(%)
m21 = mass of the specimen in 4.3.1.1.3 b) (g)
m22 = mass of the specimen in 4.3.1.1.3 d) (g)
b)
Vermin mortality rate The vermin
mortality rate of worker termite shall be calculated according to formula (12),
the mean value shall be obtained and made to an integer by rounding off the
first decimal place.
D1
M1 = x
100 ……………………………….(12)
150
Where, M1 : vermin
mortality rate (%)
D1 : total mortality number of
worker termites in 4.3.1.1.3 c)
4.3.1.1.5 Effectiveness of test When the average mass decrease rate of the non-treatment specimen
tested as the same time of the treated specimen in 4.3.1.1.3 is under 15%, the
test shall be carried out again.
6.
Performance requirements The performance
of wood preservatives shall be obtained according to the test methods in clause
4 and the record of test results in clause 5 and be confirmed to the
performance requirements as shown in table 14.
Table 14 Performance
requirements for wood preservatives
Classification of performance and test methods
|
Performance ….
|
Performance requirement
|
||
Antiseptic performance
|
Indoor test
|
Injection treatment use
|
Mass decrease rate (%)
|
3 max
|
Termite proofing performance
|
Indoor test
|
Ijection treatment use
|
Mass decrease rate (%)
|
3 max
|
Note (23):
When the treated specimen indicating 50 or more in vermin damage degree
exists,
it shall not be regarded as to satisfy the performance requirements.
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