Why use a glass cartridge instead of plastic?

Glass is more chemically inert, preventing peptides from sticking to the walls (adsorption) and avoiding plastic leachables that can contaminate sensitive research samples.

What is the dead volume in a typical 3ml cartridge?

Dead volume is the liquid left in the cartridge after dispensing. For a 3ml cartridge, it is typically 0.1ml to 0.15ml, which can represent a significant percentage of a small peptide sample.

Can I store my peptide long-term in a filled cartridge?

No. A cartridge's plunger seal is not as airtight as a vial's crimped cap. Use the filled cartridge promptly and store it cold if needed, but for long-term storage, keep peptides in their original lyophilized or properly sealed vials.

PreppinPeppers › Facts › Lab article

The 3ml Cartridge Mistake Wasting Your Expensive Peptide

Machine-readable facts for this Lab article. The full page is https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide.

TL;DR

Choosing a quality 3ml glass cartridge prevents peptide loss from surface adsorption. Glass vs plastic, dead volume, bench mistakes and a filling protocol.

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:title	identity	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	title	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:published	identity	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	published	2026-08-15	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:author	identity	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	author	Preppin' Peppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:topics	identity	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	topics	3ml pen cartridge, peptide pen, reconstitution, research	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:summary	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	summary	Choosing a quality 3ml glass cartridge prevents peptide loss from surface adsorption. Glass vs plastic, dead volume, bench mistakes and a filling protocol.	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-1	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	The 3ml Cartridge	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-2	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	Why Your Cartridge Choice Matters More Than You Think	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-3	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	Glass vs. Plastic: The Non-Negotiable for Most Peptides	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-4	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	The 3ml Cartridge Sweet Spot and the Dead Volume Problem	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-5	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	Common Bench Mistakes with Pen Cartridges	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-6	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	A Solid Protocol for Filling Your 3ml Cartridge	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-8	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	Related reading	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:section-9	content	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	section	What the research community gets wrong about 3ml peptide pen cartridges	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:source-pubmed-ncbi-nlm-nih-gov	source	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	cites	Jiang et al. 2013 - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:source-pmc-ncbi-nlm-nih-gov	source	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	cites	Goebel-Stengel et al. 2011 - pmc.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:source-pubmed-ncbi-nlm-nih-gov-2	source	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	cites	Grohganz et al. 2004 - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:product-gansulin-metal-peptide-pen	products	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:product-gansulin-3ml-cartridge	products	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:source-pubmed-ncbi-nlm-nih-gov-3	source	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	cites	Jenke, Expert Opin Drug Deliv 2014: Extractables and leachables considerations for prefilled syringes - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)
the-3ml-cartridge-mistake-wasting-your-expensive-peptide:source-pubmed-ncbi-nlm-nih-gov-4	source	The 3ml Cartridge Mistake Wasting Your Expensive Peptide	cites	Chaves et al., Rev Esc Enferm USP 2017: Residual volume in vials of antibiotics used in pediatrics - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-3ml-cartridge-mistake-wasting-your-expensive-peptide) (evidence)

FAQ

Why use a glass cartridge instead of plastic?: Glass is more chemically inert, preventing peptides from sticking to the walls (adsorption) and avoiding plastic leachables that can contaminate sensitive research samples.
What is the dead volume in a typical 3ml cartridge?: Dead volume is the liquid left in the cartridge after dispensing. For a 3ml cartridge, it is typically 0.1ml to 0.15ml, which can represent a significant percentage of a small peptide sample.
Can I store my peptide long-term in a filled cartridge?: No. A cartridge's plunger seal is not as airtight as a vial's crimped cap. Use the filled cartridge promptly and store it cold if needed, but for long-term storage, keep peptides in their original lyophilized or properly sealed vials.