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Free Swell Index
Free swell index of soil and degree of expansiveness — find out if your plot has swelling clay.
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About this test
Enter the volumes in water and kerosene to get the free swell index.
How it's calculated
- FSI = (Vw − Vk)/Vk × 100
Results are calculated from the values you enter using standard formulas. Download the PDF to keep a record. For certified testing, design or construction, talk to our engineers.
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