Material Selection And Application of Mini Diaphragm Vacuum Pumps

The material selection for mini diaphragm vacuum pumps is critical to ensure reliability and performance across diverse operational environments. Key considerations include chemical resistance, temperature tolerance, and compatibility with pumped media, as different materials directly impact the pump’s lifespan and efficiency.

Corrosive Environments: Prioritizing Chemical Resistance

In chemical processing or laboratories handling acids/alkalis, materials must withstand corrosion:

Diaphragm Materials: PTFE (Teflon) or PVDF offer exceptional resistance to strong chemicals (e.g., sulfuric acid, chlorides), with PTFE suitable for pH 0–14 media.

Pump Body Materials: 316L stainless steel or PEEK polymer prevent rust and degradation. For example, a PTFE-lined 316L body ensures zero leakage in pharmaceutical acid solutions.

High-Temperature Scenarios: Thermal Stability Requirements

At elevated temperatures (e.g., industrial drying or sterilization), materials must maintain structural integrity:

Heat-Resistant Diaphragms: Silicone rubber (up to 200°C) ， while PTFE-coated fabrics withstand 260°C.

Metal Components: Inconel alloys or titanium alloys replace standard steel to prevent thermal fatigue in 300°C+ applications.

Application-Specific Material Combinations

Chemical Industry:

Diaphragm: PTFE + ETFE coating

Body: Hastelloy C-276 (resists hydrochloric acid)

Ensures 99.9% chemical compatibility in petrochemical sampling.

Food & Beverage:

Diaphragm: FDA-compliant EPDM (resists oils/fats)

Body: 304 stainless steel (polished surface for easy cleaning)

Meets hygiene standards for vacuum packaging.

Leakage Prevention: Incompatible materials  cause swelling, leading to 10–20% increased leakage.

Lifespan Extension: A PEEK body with PTFE diaphragm in a chemical process can extend service life from 1 year to 3–5 years.