IFAN Guaranteed Quality Brass Press Fittings

EPDM is for water, especially hot water
EPDM stands for ethylene propylene diene monomer rubber . Brass press fittings with EPDM seals work best with water. They handle hot and cold potable water systems perfectly. Example: a residential hot water line uses EPDM-sealed press fittings.

EPDM chemical compatibility explained
EPDM resists polar media like water and alcohols . It also handles brake fluids (glycol-based) and dilute acids . However, EPDM is not suitable for oils or fuels . Example: never use EPDM fittings in a gasoline line.

EPDM temperature range
EPDM operates from -45°C to +150°C continuously . For plumbing applications, the typical max is 110°C . Short-term exposure to higher temperatures is possible. Brass press fittings with EPDM are safe for hot water up to 95°C. Example: a solar hot water system at 90°C works fine.

HNBR is for oil, gas, and fuel
HNBR stands for hydrogenated acrylonitrile butadiene rubber . Brass press fittings with HNBR seals are designed for hydrocarbons. They resist oils, greases, natural gas, and diesel fuel . Example: gas pipe installations always use HNBR-sealed fittings.

HNBR chemical compatibility explained
HNBR resists aliphatic hydrocarbons like propane and butane . It also handles animal and vegetable oils well. Brass press fittings with HNBR are not for water or steam. Example: a kitchen gas line requires HNBR, not EPDM.

HNBR temperature range
HNBR operates from -30°C to +140°C typically . Some formulations reach -40°C on the low end . For gas applications, the max is often 70°C at 0.5 bar pressure . Example: outdoor gas meters see winter temperatures within HNBR limits.

Color coding helps identification
EPDM seals are typically black in color . HNBR seals are typically yellow . This color difference is intentional for safety. Brass press fittings use color to prevent mix-ups. Example: a yellow seal means gas; a black seal means water.

EPDM fails with oil exposure
Exposing EPDM to petroleum causes swelling and failure. The seal can double in size and turn gummy . This is a very common and costly mistake. Brass press fittings with EPDM must stay away from oil. Example: a plumber using EPDM on an oil line causes a leak.

HNBR fails with hot water
HNBR is not suitable for hot water or hot steam . The material degrades faster under these conditions. Brass press fittings with HNBR belong on gas, not plumbing. Example: using a yellow-seal fitting on a water heater will cause premature failure.

Example: residential water system
A house needs new potable water lines. The plumber chooses brass press fittings with black EPDM seals. These handle hot water at 60°C safely. The system will last decades without seal failure. Example: EPDM is approved for drinking water (KTW certification) .

Example: commercial gas installation
A restaurant runs natural gas lines to new equipment. Yellow HNBR seals are required for safety. Brass press fittings with HNBR resist gas permeation. The installation meets gas code requirements. Example: HNBR seals are DVGW-approved for gas .

Final performance summary
Brass press fittings use different O-rings for different jobs. EPDM is for water, hot water, and steam. HNBR is for oil, gas, and fuels. EPDM fails with petroleum; HNBR fails with hot water. Color coding (black vs. yellow) prevents confusion. Always match the seal to your specific application. Using the wrong seal causes leaks, property damage, and safety hazards. Example: a simple O-ring choice determines system reliability for years.

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