Silicone is commonly used in drum pump tubes, seals, and gaskets due to its flexibility, chemical resistance, and durability. Below is a detailed guide on silicone parts for drum pumps, including selection, compatibility, and maintenance.
Why Use Silicone?
Resists many chemicals (alcohols, weak acids, bases).
Flexible & durable for repeated compression.
Non-toxic, suitable for food/pharma applications.
Limitations:
Not ideal for strong solvents (ketones, hydrocarbons).
Can swell in some oils/fuels.
Used in pump housings, joints, and valves to prevent leaks.
Works well with water, mild chemicals, and sanitary applications.
Flexible, long-lasting alternative to rubber.
Used in chemical transfer pumps.
| Compatible | Limited/Not Compatible |
|---|---|
| Water | Gasoline/Petrol |
| Alcohols (IPA, ethanol) | Acetone, MEK |
| Weak acids/bases | Toluene, Xylene |
| Food-grade liquids | Chlorinated solvents (DCM) |
| Cosmetics, pharmaceuticals | Strong oxidizers (bleach) |
Manufacturers:
Masterflex (L/S, C/L Flex)
Watson-Marlow (PharMed, Santoprene-silicone blends)
Cole-Parmer, McMaster-Carr (custom lengths)
Sizes: Typically 3mm–25mm ID, sold by meter or pre-cut.
Amazon, Grainger, The O-Ring Store (AS568 standard sizes).
Food-grade options: FDA-compliant silicone.
Some brands (e.g., Lutz, GoatThroat) sell silicone tube replacement kits for specific pumps.
Inspect regularly for cracks, swelling, or stiffness.
Clean after use (flush with water or compatible solvent).
Store properly – Avoid UV exposure, extreme heat.
Replace when:
Flow rate drops (due to tube wear).
Visible damage or leaks occur.
If silicone isn’t suitable for your fluid, consider:
| Material | Best For | Limitations |
|---|---|---|
| PTFE (Teflon) | Aggressive chemicals (acids, solvents) | Stiff, less flexible |
| Viton® | Fuels, oils, hydrocarbons | Expensive |
| EPDM | Hot water, steam | Poor with oils |
| Polypropylene | Acids, alkalis | Rigid, not for rollers |