Earnings increased 23% during the third quarter for Fluorocarbon, rising to $1.5 million from $1.2 million a year ago. The company's sales, boosted by an acquisition earlier this year, more than doubled to $52.1 million from $24.9 million. For the first nine months of the year, earnings were $4.1 million, up 42% from last year's $2.9 million. Sales increased 66%, to $123.6 million from $74.5 million. In May, Fluorocarbon bought Eaton Corp.'s industrial polymer products division, now called the Samuel Moore Group, for $69 million in cash. Based in Laguna Niguel, Fluorocarbon manufactures high-technology rubber, plastic and other industrial components.