4N is HUABO's publicly documented product page with visible batch data and a clear RFQ starting point.
Buyer decision
4N vs 4N5 high-purity aluminium: what to specify in your RFQ
4N denotes at least 99.99% aluminium; 4N5 denotes 99.995%. HUABO's documented 4N product data lists >=99.99% minimum purity and a typical batch value of 99.9936%. A target up to 4N5 or 99.995% may be submitted for project-specific feasibility review. State target purity and critical trace-element limits in the RFQ so chemistry, form, quantity, and documents can be checked together.
4N documented
Typical 99.9936%
4N5 up to 99.995%
Secondary segregation
This is a project target only; purity, element limits, form, quantity, and documents require feasibility review.
This is the published 4N batch value on the HUABO site and the practical starting point for technical review.
The tighter the purity target, the more important the application, critical trace elements, form factor, and document needs become in the RFQ.
Decision logic
When 4N is enough and when 4N5 should be requested directly
This is not a branding distinction. It is a decision about documented data, application risk, and the target purity your internal approval truly requires.
When 4N is typically enough
- You need a clearly documented high-purity grade with published batch data and RFQ-ready supporting evidence.
- Your internal specification can be reviewed against the published 4N chemistry and purity window.
- RoHS, ISO, CoA, and process evidence are enough for supplier review and technical approval.
- You want to qualify the supplier first before discussing a tighter purity target.
Direct comparison
4N and 4N5 from the point of view of sourcing, quality, and engineering
The table below does not replace technical approval, but it helps teams separate documented 4N data from a 4N5 target that still requires feasibility review.
| Topic | 4N | 4N5 |
|---|---|---|
| Role on the website | Documented product page with published batch data | Available up to 99.995% when customer requirements call for it |
| Published data | >=99.99% minimum purity, typical 99.9936% | 99.995% project target; confirm against the RFQ |
| Typical use case | When published high-purity data is sufficient for supplier review and standard RFQ work | When the application or internal specification requires a tighter impurity window |
| What the RFQ should state | Grade, quantity, form, lead time, required evidence | Target purity, critical trace elements, application, form factor, packaging, qualification needs |
FAQ on 4N and 4N5
Common questions before an RFQ or supplier call
These answers are written so sourcing, quality, and engineering can use the same language internally.
How is a 4N5 target reviewed by HUABO?
4N5 up to 99.995% is not a published standard grade. Buyers can submit target chemistry, critical elements, form, total quantity, application, and test scope for project-specific feasibility review.
What typical batch value is published for 4N?
The 4N product page publishes 99.9936% aluminium as the typical batch value. The minimum purity is listed as >=99.99%.
When should a team raise 4N5 directly?
State 4N5 directly when the purchase specification requires 99.995%, when maximum trace-element limits are decisive, or when the grade must be confirmed explicitly in supplier documentation.
What should an RFQ include for 4N5-like requirements?
A strong RFQ should state target purity, critical trace elements, intended application, required documents, form factor, packaging, and project timing.
Related pages
What to open next
These links go directly to the pages most often needed in supplier qualification or deeper technical review.
4N product page
Published batch data, documented purity, and the 4N baseline used for buyer review.
Review 4N purity and batch dataSecondary segregation
Technology page covering the process basis behind 4N and project review of a 4N5 target.
See the secondary-segregation processSupplier documents
Which documents HUABO can provide for supplier review, compliance, and internal approval.
Review supplier qualification documentsSamples, RFQ, and lead times
Operational sourcing context for samples, MOQ, lead time, and response path.
Prepare a complete technical RFQContact
Direct contact for 4N, 4N5, and technical RFQs
When purity, evidence, and product form need to be aligned together, a precise first message usually saves multiple follow-up loops.
Sales Representative
Felix Zhao
Mobile: +4915906479598
Email: felix.zhao@huabo-alu.de
Please include application, target purity, required documents, form factor, and expected project timing.