What does FR stand for?

Flexible Reinforced (ventilation duct, mining)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Fireroom First Responder (paramedic license for emergency services such as fire or police) First Robotics Fixed-Ratio Flag Representative Flag Room (gaming) Flame Resistant Flame-Retardant Flat Rack Flat Rate		Flight Recorder Flocculation Reaction - Sachs-Georgi Test Floyd Rose (inventor of the locking tremelo system, likewise named) Fluid Restriction (physiology) Fluid-Resistant Force Recon Force Recon (gaming) Force Revision Foregone Revenue Forest Renewal

Samples in periodicals archive:

One size fits all, and a flexible reinforced toe loop provides increased durability.

Gel Metatarsal Pad. (Product Spotlight)

The compatibility of the new flexible reinforced PVC compounds with a weatherable, metallic-pigmented PVC film allows the two to be combined in the mold to produce auto parts without use of metal, paint or glue, enhancing recyclability.

In-mold process imparts metalllic look to car body moldings

Metis Design's TPF technology review notes that, as the utilization of advanced thermoplastic composite materials has extended into market segments such as military and aerospace, commercial manufacturers are increasingly demanding lower cost, quicker and more flexible reinforced thermoplastic processing techniques.

Envirokare Tech Inc. Announces Technical Review of Thermoplastic ...