Rigid foam water absorption meter
Measurement methods and steps
Measurement methods and steps
1
,principle
The water absorption of the material was determined by measuring the buoyancy of the sample immersed in distilled water for a certain period of time.
2
,measuring
The following test reference: "
GB/T 8810-2005
Determination of water absorption of rigid foams" Standard test object: rigid foam;
Measuring object size: length
150mm
,width
150mm
,thickness
75mm
Overtime
500cm3
;
Ambient temperature:
(
23±2
)
°C
with(
50±5
)% relative humidity is appropriate;
Soaking solution: at least placed after distillation
48
Hour of distilled water;
Cut hard foam into grown
150mm
width
150mm
thick
75mm
Square measured object.
Place the rigid foam on the balance pan and weigh the dry rigid foam (
M1
)
Accurate to
0.1g
And recorded
The rigid foam is removed from the balance after recording. After the rigid foam is removed, the balance returns to zero.
Distilled water is poured into the transparent cylinder with the water surface above the height of the faucet.
Immerse the hanging net cage in distilled water, remove the air bubbles on the surface of the hanging net cage, and hang it on the lower hook of the balance, and call it the performance quality (
M2
)
Accurate to
0.1g
And record it, take off the hanging cage after recording.
The suspension cage is removed and the balance is returned to zero.
Note: When the suspension net is hung on the balance, the disc hanging the cage should not touch the transparent cylinder wall, and should be in the center of the transparent cylinder.
Loosen the two fixing screws on the sleeves on both sides of the suspension cage to adjust the pressure rod upwards;
Put the rigid foam on the disc
4
The bosses are centered; the pressure bar is lowered to press the rigid foam, the rigid bars are tightly fastened at both ends of the bar, and the two setscrews on the sleeves are tightened.
Re-dip the hanging net cage with the rigid foam installed in distilled water, and use a soft brush or agitate to remove the air bubbles from the hanging net cage and the rigid foam surface.
(
96±1
)
h
After soaking, the hanging net cage with rigid foam is hung on the hook under the balance, and the performance quality is weighed (
M3
)
Accurate to
0.1g
And recorded
.
Slicer usage:
1
Adjust the specimen thickness adjuster to
25mm
At the scale, loosen the sample clamping screw and set the size to
5
0
×
50mm
Place the sample in the mounting groove and tighten the sample clamping screw to press the sample.
2
Excess samples are removed along the surface of the cutter platform with a slicing knife. To ensure that the upper part of the sample is flat, the slice thickness adjuster can be used to adjust
0.3mm
,
Use a slicing knife to edge the sample.
3
The thickness of the slice is adjusted to the required thickness (clockwise for the extruded sample and counterclockwise for the sample to return the sample)
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