GB/T 18260-2000Laboratory test method for wood preservatives of determining the protective effectiveness of preservatives against termites (English PDF)

2.1 Instruments and materials

a) Vacuum pump. 0.25 L/min.

b) Vacuum meter. 100 kPa.

c) Vacuum container. It may use vacuum drier or special equipment, with adjustable

knob so as to induce preservative solution under vacuum condition.

d) Treatment container. It may use large enough containers such as beakers and glass

jars. The container shall not react with the chemical substances used. If it contains

fluorochemicals, it shall use plastic container.

e) Chemical inert weight. It is used to keep the test block from upward-floating during

treatment. This weight shall not chemically react with the medicine-agents used.

f) Test container. Glass bottle with approximately diameter of 9cm and height of 10cm.

It may also use common canned jar for substitution. Container is with cover. There

Annex A

(Normative)

The collection and weighing of Coptotermes formosanus Shiraki for test

A1 Acquisition of termites

A1.1 Acquire the termites through bait traps method. The bait trap usually uses pines

which are the preferred woods by termites. Bury them at the severe termite damaged area.

The bait is horizontally placed in the trap. And the surface wood is 20mm from the ground.

In order to prevent the topsoil falling on the wood and to conveniently acquire termites, a

layer of plastic film shall be covered on the wood surface, then be covered with earth.

A1.2 Directly acquire from nests. However, the quantity of soldier termites in the

concentrated nest is too large.

A1.3 The termites for test shall be re-acquired after swarming of each year.

A2 Collection of termites

After the termites are taken from bait traps (for the termites from nest, it may break the

whole nest), flatly place on enameled dish. Separate the termites from soil (or nest

septum) and various debris. The methods are.

Use ink to blacken one side of a piece of cardboard which is slightly smaller than the

enameled dish. And put it into water for thorough soakage (pay attention that drips due to

over-soakage are not allowed). Cover the soaked cardboard upon termites with the black

side downwards. After certain time, the cardboard may be full of termites. Remove the

cardboard and slightly knock it to make the termites into the incubator.

A3 Weighing of termites

Use ordinary pharmacist balance to weigh termites. Put 3g of termites (accurate to 0.05g)

to each test container. Because the nutritious condition of termites is different, individual

termite body may be significantly different, there are 1000 ± 100 termites for each 3g. In

Annex B

(Normative)

Test Observation Table

Laboratory temperature. °C Humidity. %

Date of observation. YY MM DD

Test blocks

Number

Activity of termites Feeding situation Death situation Others

......