Falling Sand Abrasion Tester (ASTM D 968)
The Falling Sand Abrasion Tester is broadly used to measure the abrasion resistance of paint, lacquers and other organic coatings…
Abrasion resistance is expressed in terms of the volume of abrasive required to wear through a unit thickness of the coating.
The volume of sand required to obtain total erosion of the coating on an approximate 4 mm Ø area with respect to the thickness of the coating indicates the abrasion resistance. The abrasion resistance performance is determined by increasing a amount of falling sand until the coating is removed from the substrate.
The resistence to abrasing is calculated as the abrasive loss in mass per film. It complies with ASTM D 968-83 and JG/T 133-2000 standards.
Consumables: ASTM Ottawa Sand, DIN Sand, or artificial corumdum.
Based on a design described in ASTM D 968 and other internationally recognized test standards, the Falling Sand Abrasion Tester consists of funnel which holds the abrasive particles an includes a 60° tapered end that connects to the guide tube.
Standardized abrasive particles placed in the reservoir are released to a guide tube by an abrasive flow gate key.
The guide is a 914 mm straight, smooth-bore tube which contains the abrasive particles as they fall.
Specimens are fixed under the guide tube at a 45° angle in a receptacle that includes an opening at the bottom allowing the abrasive particles to be collected in a container.
In this simple and effective standardized method, the abrasive effect is obtained when standardized sand, placed in the reservoiris released and guided by the tube onto the test specimen, positioned at a 45° angle and at a distance of 25 mm from the lower aperture of the tube.
A sturdy base and support system hold the apparatus in a vertical position.
Test Procedure:
1. The test should be carried out in at least three different circular areas｛diameter 25mm). Repeat three tests on the different locations of test panel (total 3 falling sand points). Record average abrasion resistence value.
2. Clamps are used for gripping panel on the support frame, adjusting panel until marked area is under the center of conduct pipe. Pour a certain amount of sand into hopper, open switch of falling sand, let sand go through conduct pipe and impact on the panel. The container on the bottom of instrument is used for collecting falling sand. Repeat above procedures until the coating area｛diameter 4mmis removed from the substrate. During testing, sand is applied in 2000±10ml increments. When closing terminal point of test, Pour 200±2ml sand into hopper.
3. According to the equation, abrasion resistence value is the quotient
Attention :
1.In order to ensure a cluster of sand on the center of conduct pipe, the alignment of the conduct pipe should be checked every 25 times.
2.After sand going through conduct pipe, remove fine sand by No.30 fine screen. After using 50 times, sand should be exchanged.
3.In order to get high degree of precision’s tesst result, buyer and seller should use the same source’s sand.
Specifications :
1.Structure : Falling Sand Abrasion Tester is made of
- hopper;
- switch of falling sand;
- support frame;
- conduct pipe;
- clamp;
- box and adjusting screw.
2. Parameters:
a. Overall dimensions: 230×200×1500 mm (length by width by height)
b. Length of conduct pipe: 914mm
c. Inner diameter of conduct pipe: 19mm
d. hopper volume : 3 L
e. test plate angle : 45°
f. Weight of whole machine: 25kg
g. pack weight 30 kg
Ref. 268-BGD-529
