Midwest Microlab
Sample Submission Forms

Midwest Microlab Forms

Additional Information for Sample Submission

Purchase Order (PO#) / Personalized Quote

If sending from a university or a company that requires a PO listed on the Invoice for payment, a PO# must be made available to Midwest Microlab prior to sending the results of the sample shipment to the submitter. Delay in receiving results could be due to incomplete submission forms, missing purchase order (PO#) or payment information not received. For Invoice payment purposes, a hard copy of the PO#, if available, should be shipped with the samples for fastest turnaround time. If a PO# is not available prior to shipment, please send an email to info@midwestlab.com, with a PDF version of the PO#. If you need a personalized quote for the purpose of requesting a PO, please click on the following link: Midwest Microlab Personalized Quote. 

Molecular Formula

It is important that samples include a molecular formula.  This allows us to rule out interferences and select the optimal sample size for highest accuracy.  If mistakes are made due to lack of input on this matter, retesting can be done at additional expense.  Combustion aids are available at no additional charge and should be indicated on the Submission Form. 

Air Stensitive- Glove Box Handling

Air sensitive analysis is available for any combination of Carbon, Hydrogen, Nitrogen and Oxygen testing. For an accurate evaluation of purity, air-sensitive samples require weighing under an inert atmosphere. Midwest Microlab maintains a reduced oxygen and moisture free handling system. Very highly hygroscopic samples many times will also benefit from this type of special handling. The glove box is operated with 99.9% EXTRA dry nitrogen. Purging is done under vacuum before any samples are handled. An oxygen monitor continually checks the internal environment for the presence of oxygen. The system also contains electrostatic reduction equipment to aid in handling. Samples weighed under an inert atmosphere MUST be transferrable. These samples must be either liquids or solids. Please click on the following link for Air Sensitive / Glove Box fees: Midwest Microlab Price List

Turnaround Time / Rush Services

Midwest Microlab operates by a first-in first-out service / FIFO. Most services provided at Midwest Microlab, including Sulfur analysis, has a turnaround time of approx. 3-4 business days. With the exception of Oxygen and Phosphorus analysis is within 4-5 business day turnaround time. Rush analysis is available for all services provided at Midwest Microlab for an additional fee, per sample, per run, per analysis basis. Samples requesting Rush service will be processed ahead of all other samples received, including samples previously received prior to RUSH samples. CHN Rush services requested are within a 2-business day turnaround. Please note due to the length of the procedure Oxygen, Iodine and Phosphorus Rush is a 3-4 business day turnaround.  Please note Midwest Microlab is closed on all Federal Holidays and weekends.

Vacuum Drying

Vacuum Drying is available for an additional fee, per hour for per sample, if the sample needs moisture removed prior to performing analysis. Requesting to heat a sample is vacuum drying in a temperature regulated oven. The oven is heated to the temp. requested on the submission form ( in *Celcius) with the lid off the sample and then vacuum sealing the oven door. A desiccant is located inside the oven, pulling the moisture from the sample. The vacuum drying is available for high temperature such as 110*C for a long period of time such as 2 hrs. or more. The oven increase of temp. and time for more moisture to be pulled works best for high water content samples or hygroscopic samples. Heating a sample is best for hygroscopic samples, not always best for fuel or oil type samples. Vacuum drying is available for air stable samples only, not an option for glove box handling/air sensitive samples. 

Return Shipment

Return shipment is available for air stable samples only. Please refer to the 2026 Price List for return shipment fees. 

Sample Size

The following sample size chart is based upon customer theory, per analysis, per single run, per sample. If requesting multiple analysis or duplicates, please factor that in with the sample size chart. Depending on the molecular formula we may need more or less of the sample for analysis. If your samples are Air Sensitive or require glove box handling, please include and additional 5 mg for transfer of samples to the sample chart suggestions if possible. Midwest Microlab understands that sometimes the sample is limited in quantity, therefore our chemists will make every attempt to perform analysis with the available sample weight provided. Please note accuracy is reduced if below recommended sample weight. with adding mg per analysis requested.

For air stable samples requesting C,H, N or any combination, with a 0-100% theory,  is a minimum of 3 mg per single run. For Air Sensitive/ Glove Box handling requesting C,H, N or any combination, with a 0-100% theory, is a minimum of 5 mg per single run.

Shipment Information

The new submission forms are editable online: Midwest Microlab Submission Form. Please print and include 1 completed submission form PER sample in your shipment. For air stable sample containers, we usually see 10 ml screw cap glass vials. Please include the submitter Theory Total % per element analysis requested and Molecular formula (list of elements) if known on the Midwest Microlab Submission Form. This information will provide critical details for the chemists to determine if there are possible interferences within the sample to perform analysis or if the sample needs additional additives for complete combustion. The shipping address can be found below, which can also be found in the lower left-hand corner of the submission form.

Air Sensitive Sample Shipment

Small glass ampoules or compression sealed vials are the best ways to send air sensitive samples. This helps to eliminate any degradation in transit. Samples that are only slightly oxygen sensitive, can give good results when sealed tightly in screw cap vials. For these a second sealed outer vial should be included. Please do NOT have the vials sealed with wax, as wax will damage the gloves within the glove box. If samples are received with was sealant, the wax will be removed outside of the glovebox and possibly exposing the samples to outside environmental conditions. As with all analysis, samples MUST be highly purified or homogenous to achieve good results. Samples that are suspected to be heterogenous, not pure, should be requested to perform in duplicate analysis. 

You may send your samples to the following address:
Midwest Microlab
Attn: Receiving Dept.
7212 North Shadeland Ave.
Suite # 110
Indianapolis, IN 46250
Phone: (317) 849-6606
Email: info@midwestlab.com

Payment / Invoice Due Date

Invoices will be sent to the listed Invoice email address provided on the Midwest Microlab submission form within 7 business days of sending results to the submitter. Midwest Microlab accepts ACH/Direct Deposit, Check and Credit Card (Credit Card charges have an additional processing fee associated) for payment types. ALL services rendered at Midwest Microlab has payment due within, which can also be found on the Invoice under Due Date. net 30 days.  Payment inquiries can be directed via the following methods: Midwest Microlab Phone #: 317-849-6606, Midwest Microlab Fax #: 317-849-8534 or Midwest Microlab Email:  info@midwestlab.com. Results may not be sent to the submitter until payment information or copy of the Purchase Order Number has been provided to Midwest Microlab finance department.

Credit Card Payment Procedure  

The Credit Card authorization Form can be found on the following link: FORMS section. Please return via Email:  info@midwestlab.com, sent with sample shipment requesting analysis, Midwest Microlab Fax #:  317-849-8534, or calling Midwest Microlab Office #:  317-849-6606 between office hrs. from 9 am – 3 pm EST.  Please note there is an additional Credit Card processing fee that will be added to the Invoice. A Paid in Full receipt will be sent directly after the Credit Card is charged to the listed Invoice email provided. Midwest Microlab does not charge the credit card until after services are rendered and will only be charged for the services provided. 

 If you have any follow up questions for me or for our chemists on staff, just let us know. We look forward to receiving your samples and providing service.