Poly Metal India

What is a Diaphragm Rubber Sheet?
A flexible, reinforced rubber sheet designed to act as a barrier while allowing flexing or movement under pressure differences.
It creates a seal while allowing movement without leakage between two surfaces.
Made from elastomers like Neoprene, Nitrile (NBR), EPDM, Silicone, or Viton depending on the chemical and temperature resistance needed.
Often fabric-reinforced (nylon, canvas, polyester) for added strength and durability.
Key Properties:
High elasticity and flexibility
Good tensile strength
Chemical and oil resistance (depending on material)
Can handle vacuum and pressure cycling without leakage
Good weather and aging resistance (in case of EPDM, Silicone)
Available Thickness:
Typically 0.3 mm to 3 mm (can vary based on application).
Supplied in sheets or cut to size for diaphragms.
Typical Uses:
1⃣ Industrial Valves & Pumps:
Used in diaphragm pumps to separate the fluid from the moving parts while allowing pumping action.
Used in control valves and pressure regulators.
2⃣ Automotive:
Fuel pump diaphragms, carburetor diaphragms, brake systems.
3⃣ Meters & Instruments:
Water meters, gas meters, and pressure gauges to allow pressure transmission while isolating media.
4⃣ Pharmaceutical & Food Industry:
In sanitary diaphragm valves to control flow without contamination.
Food-grade rubber diaphragms (Silicone, EPDM) used where hygiene is critical.
5⃣ Hydraulic & Pneumatic Systems:
Used in actuators to convert pressure to mechanical movement without leakage.
Material Selection Guide:
MaterialKey ResistanceApplicationsNeopreneOil, moderate chemicalsGeneral industrialNitrile (NBR)Oil and fuelAutomotive, oil linesEPDMWeather, water, steamWater meters, outdoorSiliconeHigh temperature, food gradeFood, pharmaVitonChemicals, high tempChemical processing
Maintenance and Care:
Avoid sharp bends and folding during storage.
Store in a cool, dry place away from sunlight.
Check for wear and cracks regularly to prevent leakage or failure.
If you want, I can also provide:  A selection guide for your specific machine/pump
Supplier/brand suggestions in India for procurement
A comparison with PTFE diaphragm sheets for aggressive chemical use.