Shipping Policy

1. Shipping choices, charges, and free-shipping threshold

Checkout shows the shipping services, charges, and delivery estimates available for the entered delivery address and cart. FedEx 2Day shipping is $10 flat for eligible U.S. orders below the free-shipping threshold. Carrier transit is estimated at two business days after dispatch; order processing time is additional. Free standard U.S. shipping is available when discounted merchandise reaches $125. Shipping charges, fees, and taxes do not count toward the threshold. Eligibility is recalculated after item-level promotion, volume, or Stack Builder savings. Only a service displayed for that order can be selected. A product page, support message, or previous order does not reserve inventory or promise a shipping method, rate, cutoff, or delivery date.

2. Service area

Unless Stack Research expressly agrees otherwise in writing after compliance review, orders are limited to lawful destinations within the United States. Stack Research may refuse a state, territory, postal code, forwarding service, post-office box, facility, customer, end user, or destination based on product restrictions, carrier rules, supplier limits, sanctions, safety, fraud, or legal risk.

3. Processing and delivery estimates

Processing begins after order acceptance, confirmed payment, any required compliance review, and receipt of complete delivery information. Processing and carrier transit estimates shown at checkout or in an accepted order are not guarantees unless the accepted order expressly says otherwise. If a prepaid order cannot ship within the represented time—or within the period required when no time was represented—we will provide the legally required delay option, cancellation, or refund for unshipped merchandise.

4. Tracking and split shipments

When tracking is available, it will be sent to the order email after carrier acceptance. An order may ship in more than one parcel when stated in the order record. The customer is responsible for monitoring tracking, arranging prompt receipt by authorized personnel, and reporting a carrier exception. Do not rely on an order-status email alone when the carrier record provides more recent information.

5. Address accuracy and changes

The customer is solely responsible for providing and reviewing a complete lawful delivery address, authorized recipient, facility access details, and delivery instructions before submitting an order. An address change is not guaranteed after processing or label production begins. Except where the accepted order terms or applicable law require otherwise, Stack Research is not responsible for loss, delay, return, or added cost caused by a customer-supplied address, recipient, access, refusal, forwarding, or collection error.

6. Delays, loss, damage, and delivery scans

Weather, carrier capacity, security screening, government action, address problems, service interruption, and other events may cause delay. A delivery scan is evidence of delivery, but Stack Research may review it with available carrier, location, signature, and customer records. Report carrier loss, visible transit damage, an incorrect item, or an item missing from a delivered parcel under the Returns & Refunds Policy and preserve every package, seal, label, and item. A verified shipping-protection claim may be replacement-first. We may complete a carrier or insurance investigation before determining the remedy.

7. Packaging, storage, and temperature

A shipping method or cold pack does not establish suitability for a research use and does not replace product-specific storage and handling records. The customer must have trained personnel, suitable receiving conditions, and appropriate storage available at delivery. A temperature-control, stability, sterility, or viability representation applies only when expressly supported and included in the accepted order terms. Warm packaging or a thawed cold pack alone does not establish compromise; a claim is evaluated against the product-specific packaging, transport, storage, and stability terms.

8. Return-to-sender packages

A parcel returned by a carrier because of an address error, refusal, failed collection, access restriction, or other customer-controlled issue is not an authorized unopened return and is not automatically refundable. Any reshipment, replacement, credit, or refund is subject to the Returns & Refunds Policy and may exclude nonrecoverable shipping, fulfillment, insurance, disposal, and payment-processing costs where permitted. Returned research material is quarantined and never restocked.

9. Restrictions and compliance

The customer is responsible for destination-specific possession, transportation, receiving, facility, and research requirements. Stack Research may hold, decline, or cancel a proposed shipment pending customer, product, end-use, destination, or documentation review. Neither shipment nor delivery is regulatory approval or permission for a prohibited use.

10. Authorized returns address; no public pickup

Do not send products without written return authorization. An eligible unopened-product return must be requested within 14 calendar days after delivery and shipped with tracking within seven calendar days after authorization. Authorized physical returns are routed to:
Stack Research LLC — Returns
312 W 2nd St PMB 5016
Casper, WY 82601, USA

This PMB receives authorized returns only. It is not a public pickup, fulfillment, inventory, office, or laboratory location. Follow the instructions in the written authorization before shipping anything.

11. Contact

Send a shipping question or claim to support@stack-research.com with the order number and tracking details. Support is available Monday through Friday, 9:00 a.m. to 5:00 p.m. Eastern Time, excluding U.S. federal holidays, and we aim to send an initial response within one business day.

12. Business information

Stack Research LLC issues this policy. Use the email below for questions. The registered business address and mailing address serve different purposes.

Stack Research LLC, a Wyoming limited liability company
Registered business address: 30 N Gould St Ste R, Sheridan, WY 82801-6317, USA
Business mailing address: 7901 4th St N #29260, St. Petersburg, FL 33702, USA
Email: support@stack-research.com
Support hours: Monday through Friday, 9:00 a.m. to 5:00 p.m. Eastern Time, excluding U.S. federal holidays