Polypore Int'l (PPO) and Clean Harbors (CLH)

On Tuesday, this technology filtration company announced some solid second-quarter numbers, but its share price still dropped approximately 10%.

Today, however, it finished the session as THE top-performing Zacks #1 Rank company with a gain of 13.36%. Volume neared 2.3 million shares, compared to the daily average of about 735,000.

PPO experienced some upward revisions in the past 7 days. There have been two upward revisions out of 9 total estimates for this year, and one upward revision out of the same number of estimates for 2012.

Overall, estimates have been moving largely higher for a while now. The Zacks Consensus Estimate for this year is currently $2.24 per share, which is up 28% in 3 months. It has also moved higher by 1.4% in a week.

As for 2012, the Zacks Consensus Estimate of $2.82 per share suggests year-over-year growth of around 26%. The guidance is up 27% in 3 months and a penny within 7 days.

The second-quarter saw earnings per share jump to 63 cents from 34 cents last year. The result topped the Zacks Consensus Estimate by 12.5%. In the past 10 quarters, PPO beat 8 times, matched once and missed once.

Sales advanced 31% to $196.4 million, as the company enjoyed strong demand and excellent manufacturing performances across its business.

While the company is optimistic for the future, the second half does hold a few challenges. PPO said it could have problems exceeding the second-quarter's performance until additional capacity comes online, and expects to feel a seasonal impact stemming from European holidays in the third quarter. Such factors were the likely reason that the share price moved lower Tuesday.

Polypore International is a worldwide developer, manufacturer and marketer of highly specialized polymer-based membranes used in separation and filtration processes. It is currently the only company from the elec – miscellaneous components industry on today's Zacks #1 Rank List.

The only other company to finish Wednesday's session with a double-digit gain was Clean Harbors, Inc. (CLH - Snapshot Report), which released a second-quarter report today that including a positive EPS surprise and an enhanced revenue guidance for the year.

Shares moved higher by practically 11%. Volume skyrocketed to more than 2.1 million shares, versus the daily average of about 400,000.

Clean Harbors is the leading provider of environmental, energy and industrial services throughout North America, serving more than 50,000 customers. It is currently the only company from the Waste Removal Services industry on today's Zacks #1 Rank List.

For the second quarter, earnings per share of 55 cents surpassed the Zacks Consensus Estimate of 42 cents. Revenues came to $447.2 million, which also bettered expectations but was down from last year. Of course, last year included revenue related to Gulf of Mexico clean up.

Speaking of oil, CLH's Oil & Gas Field Services segment advanced by 40% during the quarter.

The company now sees full-year revenue between $1.84 billion and $1.88 billion, compared to the earlier guidance of $1.62 billion and $1.67 billion.

Earnings estimates have been moving higher for Clean Harbors, but might be poised for an even sharper advance in days to come. For the moment, the Zacks Consensus Estimate for 2011 is $1.74 per share, which is up 2.4% in 30 days.

Meanwhile, the Zacks Consensus Estimate for 2012 is $2.20 per share, or 2.8% better than a month ago. The guidance also suggests year-over-year growth of more than 26%.

Read the full analyst report on CLH

Read the full analyst report on PPO