Product Overview
MF1 Soft — Technical Overview & FAQs
Product Overview
MF1 Soft is a lightweight cellular silicone foam block designed for applications requiring cushioning, sealing or vibration absorption, especially where fire, smoke and toxicity (FST) resistance is critical. It is the “Soft” firmness grade within the MF1 series.
Applications
Cushioning in rail seating and mass transit interior assemblies
Environmental sealing in electronic or industrial enclosures
Vibration isolation pads and lightweight structural cushioning
Performance Advantages
MF1 Soft features very low density (~5 lb/ft³), very low compression force (~0.2-1.2 psi), excellent fire and smoke resistance (UL94 V-0/HF-1, FMVSS-302), very low compression set (~1.5%) and service temperature up to ~392 °F. It remains resilient under long-term use and severe environmental conditions.
Key Properties
Density approximately 5.0 lb/ft³. Compression force deflection range about 0.2-1.2 psi. Compression set around 1.5% after 22 hrs at 212 °F at 50% compression. Tensile strength ~12.5 psi. Elongation ~45%. Thermal conductivity ~0.036 W/m·K uncompressed. Low temperature flex passes at -67 °F.
FAQs
What is MF1 Soft?
A soft cellular silicone foam designed for cushioning and sealing in applications where weight, comfort and fire/smoke performance matter.
Where is MF1 Soft used?
It’s used in rail seating cushions, electronics enclosure seals, vibration pads, and other applications needing FST resistance and durability.
What makes MF1 Soft different from baseline foams?
It offers ultra-lightweight structure (~5 lb/ft³), very low compression force (~0.2-1.2 psi), and outstanding fire, smoke and toxicity resistance, plus wide-temperature stability.
What temperature and fire rating does MF1 Soft have?
It supports continuous use up to ~392 °F, passes UL94 V-0/HF-1 and FMVSS-302, and withstands low-temperature flex at -67 °F.
Can MF1 Soft be converted or die-cut?
Yes, MF1 foam blocks can be skived, die-cut or machined into cushions, gaskets, pads or profiles to fit design requirements.
Request MF1 Soft silicone foam samples, datasheets or custom cut parts from H-O Products - contact us.