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Quiz Leaderboard: 2/21 - 3/23/2018    Sign in to track your quiz score! | Full Leaderboard

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High pressure, supplied-air respirators used for abrasive blasting normally have an Assigned Protection Factor of 25. What does this NIOSH rating mean?

The wearer is protected from dust particles of 25 microns or smaller.
The operator can work in environments with contaminants present at 25 times OSHA's permissible exposure limit.
The wearer can be exposed to a hazardous environment for up to 25 minutes.
None of these.

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Previous Quizzes from the Past Week

Tuesday, November 22, 2011
What ASTM Committee deals with nuclear coatings?

Monday, November 21, 2011
What infestation has recently caused the fouling of intake structures at hydroelectric facilities in the Southwest?

Friday, November 18, 2011
What are you seeing on this steel surface magnified 100 times?

Wednesday, November 16, 2011
Manufacturers of supplied air respirators must acquire approval for these products from what agency?

Tuesday, November 15, 2011
True or false: Coating manufacturers no longer recommend coal tar epoxy coating systems.

More previous quizzes
Bullard Made in the USA

Tarps manufacturing, Inc.
QUALITY MADE IN AMERICA —Available near you!
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.

SAFE Systems, Inc.
SAFE Systems'
Blast Lights &
Deadman Switches
Halogen or LED blast lights available with our NEW urethane bumper. Switches available in many colors for color coding your hoses.

SABRE Autonomous Solutions
Personnel are free to do other tasks while the ALPHA1 does the “dirty work”.

Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors
Vacuum and dust collector hose, filters and related accessories.

Absolute Equipment/Grand Rental Station
We have Tier 4 Equipment including Air Compressors & Generators for Sale & Rent! Your job may now require Tier-4. or Call 412-931-6655.

Graco Inc.
Graco EcoQuip 2: Experience the Difference
While others claim their equipment is the same, none of them compare to Graco’s EcoQuip 2™ Vapor Abrasive® blasting line. Visit to learn more.

Vector Technologies Ltd.
The Original Performance Proven Vacuum Solutions
VecLoader® 616 Double Dump, Continuous Vacuum, 170 HP w/ 2,400 CFM & 28” Hg. 33% More Efficient than traditional vacuum systems! Choose Vector for the most powerful and the most reliable trailer mounted vacuums in the industry! Email us at: or call us at: 800-832-4010

CHLOR*RID International Inc.
Companies that invest in corrosion control use CHLOR RID products
  • Soluble salt removal liquid
  • Test kits to verify contamination levels
  • Surface passivation to hold the blast
INFO@CHLOR-RID.COM 800.422.3217

Sauereisen, Inc.
SewerGard® 210XHB
• 300 mils in a single coat by plural component equipment
• Fast Setting
• 100% Solids Epoxy
• Chemical-resistant barrier for municipal wastewater environments


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