Household Appliances: Reducing NVH (Noise, Vibration, Harshness) in Washing Machines.

Reducing NVH in Washing Machines: A Material Science Approach

Problem Statement

Washing machines require effective NVH reduction to ensure quiet operation and durability. Traditional EPDM compounds often fail under high-temperature cycles and prolonged exposure to detergents, leading to compression set and noise amplification.

Material Science Analysis

EPDM exhibits poor resistance to detergents and oils, causing swelling and degradation. HNBR, with its high nitrile content, offers superior chemical resistance. Its hydrogenated backbone ensures thermal stability up to 150°C, preventing compression set failure. Fluorine-rich FKM provides exceptional resistance to detergents and high temperatures, but its higher cost limits widespread use.

Technical Specs

• Material: HNBR
• Shore A Hardness: 70 ± 5
• Tensile Strength: 20 MPa
• Elongation at Break: 300%
• Temperature Range: -40°C to 150°C
• Compression Set: 15% (22 hours at 125°C)

Material Comparison

Material	HNBR	EPDM	FKM
Shore A Hardness	70 ± 5	65 ± 5	75 ± 5
Tensile Strength (MPa)	20	15	22
Elongation at Break (%)	300	350	250
Temperature Range (°C)	-40 to 150	-50 to 125	-20 to 200
Compression Set (%)	15	25	10
Chemical Resistance	High	Low	Very High

Standard Compliance

RubberQ adheres to IATF 16949 standards, ensuring batch-to-batch consistency in material properties. Our HNBR compounds meet ASTM D2000 specifications for elastomer performance and ISO 3601 for sealing applications.

For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.