Membrane fabric and dewar flask: what they have in common

1. Step 1. Membrane fabric — evolved from — Waterproof fabric. A breathable waterproof fabric.
2. Step 2. Waterproof fabric — is made of — Natural rubber. Rubber between the layers.
3. Step 3. Natural rubber — is material for — Vulcanized rubber. Rubber vulcanized with sulfur.
4. Step 4. Vulcanized rubber — is material for — Milking machine. Teat liners.
5. Step 5. Milking machine — uses — Vacuum. Vacuum milking.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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