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Lab Technician - 3rd shift

Brenntag · Menomonee Falls, WI · Full time

Posted Oct 5, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about how you keep lab notebooks and records.

What they are checking: Recordkeeping discipline, which allows any result to be traced and defended.

This is third shift. How do you stay accurate and alert working overnight?

What they are checking: Self-management on a night schedule where mistakes are easier to make.

Tell me about a time you caught an error that others missed.

What they are checking: Attention to detail and willingness to raise concerns.

What would you do

A sample fails to meet specification. What do you do next?

What they are checking: Following procedure, retesting where appropriate and escalating to the manager as the posting requires.

About the work

Walk me through how you test a finished product against its specification before it ships.

What they are checking: A methodical approach to standardized testing that protects customers from bad product.

How do you prepare reagents and standard solutions so your results can be trusted?

What they are checking: Careful lab technique, since bad reagents lead to wrong results and wrong decisions.

What is a certificate of analysis, and why does it matter to customers?

What they are checking: Understanding that the lab's results become a promise to customers about product quality.

How do you calibrate an instrument, and how do you know it is working correctly?

What they are checking: Instrument care and calibration habits that keep data accurate.

How do you handle retain samples, including storing and disposing of them?

What they are checking: Following sample control rules that support quality investigations later.

What lab safety practices do you follow when working with chemicals?

What they are checking: Safe habits with protective equipment, ventilation and chemical handling in a lab.

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The full job description

As published by Brenntag.

YOUR ROLE & RESPONSIBILITIES • Perform laboratory inspections and analyses using detailed standardized procedures; analyze finished products from inventory to ensure compliance with specifications and acceptability for shipments to customers, analyze incoming raw materials to assure compliance with specifications, analyze tank samples to provide and maintain certificate of analysis reports for customers. Confer with manager on products that do not conform to specifications. Prepare reagents and standard solutions required for various analyses. • Prepare samples, label and store retain samples of products. Properly dispose of all retain samples. Furnish sales samples of tested materials to authorized customers and prospects. • Maintain accurate records in laboratory notebooks including sample origin and identification, analytical data, interpretation of data and final disposition of products analyzed. Enter data into analytical results logbooks. Maintain records necessary for the current file system involving certification sheets and purchasing specifications. • Perform routine instrument maintenance and calibration as necessary; inspect, adjust and perform minor instrument repairs involved with a continuous instrument maintenance process; calibrate instruments and appropriate reagents using certified standards in accordance with a continuous calibration process; maintain an inventory of essential consumable instrument parts. • Perform related laboratory duties, maintain inventory of laboratory supplies, provide analytical data to authorized parties, and maintain clean, safe and orderly conditions within the laboratory. Maintain current systems for product quality certification and purchasing specifications. Prepare and maintain blend production sheets. Review customer specifications. Perform other duties as directed. • Develop, modify, verify, and validate methods. • Complies with company, safety and regulatory policies and standards. Attend safety, regulatory, and company training as required. • Complies with continuous quality improvements and ISO standards. YOUR PROFILE Education and Experience: • Bachelor degree, or Associates degree (A.A.) or equivalent from two-year college or technical school; or six months to one year related experience and/or training; or equivalent combination of education and experience. OUR OFFER • We aim to create an environment where the best people want to work, where they can turn their passion into their job and realize their full potential. • Individual development, on-the-job training, and development programs designed to help our employees grow in their careers. • Paid parental leave • Education assistance program • Employee assistance program • Various healthcare plan options as well as 401(k) INTERESTED? We look forward receiving your application. Brenntag provides equal employment opportunities to qualified applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability or any other status protected by applicable federal, state or local law. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to access job openings or apply for a job on this site as a result of your disability. You can request reasonable accommodations by contacting Human Resources at accommodations@brenntag.com (phone, tty, fax, email, etc.). Brenntag North America, Inc. and its subsidiaries use E-verify, a government-run, web-based system that allows employers to confirm the eligibility of their employees to work in the United States. For more information, please go to https://www.e-verify.gov/employees or view the poster at https://e-verify.uscis.gov/web/media/resourcesContents/E-Verify_Participation_Poster.pdf. Brenntag TA Team

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