> For the complete documentation index, see [llms.txt](https://docs.rplpeptides.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rplpeptides.com/docs/guides/peptide-specification-guide.md).

# Product Specification Guide

| Field            | Value                                                        |
| ---------------- | ------------------------------------------------------------ |
| **Document ID**  | RPL-GUIDE-SPC-001                                            |
| **Version**      | 1.0                                                          |
| **Publisher**    | RPL Peptide (Qingdao RPL Biotechnology Co., Ltd.)            |
| **URL**          | <https://rplpeptides.com/guides/peptide-specification-guide> |
| **Last Updated** | July 2026                                                    |

***

## 1. Introduction

Product specifications define the quality parameters that each batch must meet. This guide explains the standard specifications for RPL Peptide products.

## 2. Specification Overview

| Parameter | Standard | High Purity |
| --------- | :------: | :---------: |
| Purity    |   ≥98%   |     ≥99%    |
| Water     |    <5%   |     <3%     |
| Endotoxin | <5 EU/mg |   <1 EU/mg  |

## 3. Appearance

Specification: White to off-white lyophilized powder Any yellowing, browning, or discoloration indicates possible degradation.

## 4. Purity

Measured by HPLC area % at 214 nm. ≥98% standard. Batches below spec are quarantined.

## 5. Identity

Confirmed by HPLC retention time + MS molecular weight. Both methods must pass.

## 6. Water

Karl Fischer method. <5% for standard products. Higher water content affects stability and concentration calculations.

## 7. Packaging

Type I borosilicate glass vials Rubber stopper with aluminum seal Labeled with product name, batch number, quantity, and QR code

## 8. Acceptance Criteria

All parameters must pass before batch release. Any failure triggers deviation investigation.

## 9. Batch Release

Final approval by quality manager. COA issued for each released batch. Available at <https://rplpeptides.com>

***

## Document Revision History

| Version |    Date   | Changes         |
| :-----: | :-------: | --------------- |
|   1.0   | July 2026 | Initial release |

***

© 2026 RPL Peptide

rplpeptides.com


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.rplpeptides.com/docs/guides/peptide-specification-guide.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.