LY/T 3236-2020Grading and evaluation methods for odor of wood-based panels and its products (English PDF)

4.1 Wide-mouth glass bottle

It shall comply with the requirements of GB/T 11414-2007, with a volume of 2 500 mL,

a sealed lid that is easy to open and close, and no odor at the temperatures of (20±2) °C

and (65±2) °C. Figure 1 is a typical drawing of the dimensions of a wide-mouth glass

bottle.

4.3 Oven

Temperature can be maintained at (65±2) °C.

4.4 Constant temperature and humidity chamber

Temperature ranges within 10 °C ~ 80 °C, with an accuracy ±2 °C; relative humidity

ranges within 10% ~ 95%, with an accuracy of ±5%.

6.1 Selection of evaluators

6.1.1 The evaluators shall have no olfactory defects, no habits such as smoking, using

heavily scented cosmetics, or chewing gum, etc. that affect the olfactory evaluation

ability, and shall have relatively keen sense organs and identification abilities. Before

starting the evaluation, identification tests shall be conducted to select individuals with

better sensory sensitivity.

6.1.2 Prepare 4 samples of isoamyl acetate aqueous solution with the same volume and

6.2 Requirements of evaluators

6.2.1 The evaluation team shall consist of an odd number of 3 or more members.

6.2.2 On the day of the test, odor evaluators shall not carry or use odorous spices,

cosmetics or skin care products that may affect the olfactory evaluation ability, and shall

not eat foods with pungent odors. Odor evaluators who are suffering from colds or

olfactory organ discomfort shall not participate in the measurement on that day.

7.1 Plain wood-based panels

For plywood, particleboard, fiberboard, block board, glued-laminated timber and other

plain wood-based panels, an edge of (20±0.5) mm shall be removed, and then the test

piece shall be prepared from any part. The specification of the test piece is (25±0.5)

mm × (25 ±0.5) mm × panel thickness, and the total weight of the test piece is (200±10)

g.

7.2 Decorated wood-based panels

For decorated wood-based panels, an edge of (20±0.5) mm shall be removed, and then

the test piece shall be prepared from any part of the panel.

7.3 Wooden floors

For wooden floors, the test piece shall be prepared after removing the tongue and

groove. The specification of the test piece is (150±0.5) mm × (150±0.5) mm × floor

thickness, and the four sides are sealed with odorless aluminum foil. If the wooden floor

sample is not wide enough, it can be spliced. The number of test pieces is 10.

7.5 Wooden doors

Prepare test pieces from the four corners and edges of the wooden door. The

specification of the test piece is (150±0.5) mm × (150±0.5) mm × door thickness, the

sawn edges are sealed with odorless aluminum foil. It shall be ensured that at least 4

test pieces are taken from the four corners, and the remaining test pieces can be taken

from the edges (retaining the door edges). The number of test pieces is 8.

7.6 Wood-based panel products

Prepare a test piece from the edge-sealed corner of the wood-based panel product. The

specification of the test piece is (150±0.5) mm × (150±0.5) mm × panel thickness. If

the sample size is not enough, multiple samples can be sawed and cut to form one test

piece. Seal the sawn edges with odorless aluminum foil.

8.1 Pretreatment of test pieces

Before the test, place the test pieces in an odorless environment with a temperature of

(20±2) °C and a relative humidity of (65±5) %, and adjust for 72 h ± 5 min.

8.2 Test steps

8.2.1 Plain wood-based panels

8.2.2 Decorated wood-based panels, wooden floors, wooden wall panels, wooden

doors and wood-based panel products

4.1 Wide-mouth glass bottle

It shall comply with the requirements of GB/T 11414-2007, with a volume of 2 500 mL,

a sealed lid that is easy to open and close, and no odor at the temperatures of (20±2) °C

and (65±2) °C. Figure 1 is a typical drawing of the dimensions of a wide-mouth glass

bottle.

4.3 Oven

Temperature can be maintained at (65±2) °C.

4.4 Constant temperature and humidity chamber

Temperature ranges within 10 °C ~ 80 °C, with an accuracy ±2 °C; relative humidity

ranges within 10% ~ 95%, with an accuracy of ±5%.

6.1 Selection of evaluators

6.1.1 The evaluators shall have no olfactory defects, no habits such as smoking, using

heavily scented cosmetics, or chewing gum, etc. that affect the olfactory evaluation

ability, and shall have relatively keen sense organs and identification abilities. Before

starting the evaluation, identification tests shall be conducted to select individuals with

better sensory sensitivity.

6.1.2 Prepare 4 samples of isoamyl acetate aqueous solution with the same volume and

6.2 Requirements of evaluators

6.2.1 The evaluation team shall consist of an odd number of 3 or more members.

6.2.2 On the day of the test, odor evaluators shall not carry or use odorous spices,

cosmetics or skin care products that may affect the olfactory evaluation ability, and shall

not eat foods with pungent odors. Odor evaluators who are suffering from colds or

olfactory organ discomfort shall not participate in the measurement on that day.

7.1 Plain wood-based panels

For plywood, particleboard, fiberboard, block board, glued-laminated timber and other

plain wood-based panels, an edge of (20±0.5) mm shall be removed, and then the test

piece shall be prepared from any part. The specification of the test piece is (25±0.5)

mm × (25 ±0.5) mm × panel thickness, and the total weight of the test piece is (200±10)

g.

7.2 Decorated wood-based panels

For decorated wood-based panels, an edge of (20±0.5) mm shall be removed, and then

the test piece shall be prepared from any part of the panel.

7.3 Wooden floors

For wooden floors, the test piece shall be prepared after removing the tongue and

groove. The specification of the test piece is (150±0.5) mm × (150±0.5) mm × floor

thickness, and the four sides are sealed with odorless aluminum foil. If the wooden floor

sample is not wide enough, it can be spliced. The number of test pieces is 10.

7.5 Wooden doors

Prepare test pieces from the four corners and edges of the wooden door. The

specification of the test piece is (150±0.5) mm × (150±0.5) mm × door thickness, the

sawn edges are sealed with odorless aluminum foil. It shall be ensured that at least 4

test pieces are taken from the four corners, and the remaining test pieces can be taken

from the edges (retaining the door edges). The number of test pieces is 8.

7.6 Wood-based panel products

Prepare a test piece from the edge-sealed corner of the wood-based panel product. The

specification of the test piece is (150±0.5) mm × (150±0.5) mm × panel thickness. If

the sample size is not enough, multiple samples can be sawed and cut to form one test

piece. Seal the sawn edges with odorless aluminum foil.

8.1 Pretreatment of test pieces

Before the test, place the test pieces in an odorless environment with a temperature of

(20±2) °C and a relative humidity of (65±5) %, and adjust for 72 h ± 5 min.

8.2 Test steps

8.2.1 Plain wood-based panels

8.2.2 Decorated wood-based panels, wooden floors, wooden wall panels, wooden

doors and wood-based panel products