It seems like youre referring to E LINK BFC or Back Fill Compound However the context is unclear Could you clarify what youre asking about Here are a few possibilities
1 Backfill Compound BFC In construction or engineering a backfill compound is a material used to fill excavated areas such as trenches or around foundations to provide stability and support It could be a specific product or material
2 E LINK BFC If this is a specific product or system it could be related to a proprietary material technology or process used in a particular industry
If you provide more details or context I can help clarify or provide more specific information
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