At-a-Glance Details About Agilent Capillaries

The following section provides useful information about Agilent capillaries and its characteristics.

Syntax for capillary description

Type - Material - Capillary dimensions - Fitting Left/Fitting right

**Table:** Example for a capillary description
Code provided with the part	Meaing of the code
Color code:	Material of the product is MP35N, the inner diameter is 0.20 or 0.25 mm
Capillary	The part is a connection capillary
MP35N	Material of the part is MP35N
0.25 x 80 mm	The part has an inner diameter of 0.25 mm and a length of 80 mm
SI/SI	Left fitting: Swagelok + 1.6 mm Port id, Intermediate Right fitting: Swagelok + 1.6 mm Port id, Intermediate

To get an overview of the code in use, see

Color: Color-coding key for Agilent capillary tubing
Type: Type (gives some indication on the primary function, like a loop or a connection capillary)
Material: Material (indicates which raw material is used for the capillary)
Dimension: Capillary dimensions (indicates inner diameter (id), length, and volume of the capillary)
Fittings: Fitting left/fitting right (indicates which fitting is used on both ends of the capillary)

Color Coding Guide

**Table:** Color-coding key for Agilent capillary tubing
Internal diameter in mm		Color code
0.015		Orange
0.025		Yellow
0.05		Beige
0.075		Black
0.075	MP35N	Black with orange stripe
0.1		Purple
0.12		Red
0.12	MP35N	Red with orange stripe
0.17		Green
0.17	MP35N	Green with orange stripe
0.20 /0.25		Blue
0.20 /0.25	MP35N	Blue with orange stripe
0.3		Grey
0.50		Bone White

NOTE

As you move to smaller-volume, high efficiency columns, you’ll want to use narrow id tubing, as opposed to the wider id tubing used for conventional HPLC instruments.

Abbreviation Guide for Type

**Table:** Type (gives some indication on the primary function, like a loop or a connection capillary)
Key	Description
Capillary	Connection capillaries
Loop	Loop capillaries
Seat	Autosampler needle seats
Tube	Tubing
Heat exchanger	Heat exchanger

Abbreviation Guide for Material

**Table:** Material (indicates which raw material is used for the capillary)
Key	Description
ST	Stainless steel
Ti	Titanium
PK	PEEK
FS/PK	PEEK-coated fused silica^{Fused silica in contact with solvent}
PK/ST	Stainless steel-coated PEEK^{Stainless steel-coated PEEK}
PFFE	PTFE
FS	Fused silica
MP35N	Nickel-cobalt-chromium-molybdenium alloy

^[1]Fused silica in contact with solvent

^[2]Stainless steel-coated PEEK

Abbreviation Guide for Capillary Dimensions

**Table:** Capillary dimensions (indicates inner diameter (id), length, and volume of the capillary)
Description
id (mm) x Length (mm)
Volume (µL)

Abbreviation Guide for Fitting Left/Fitting Right

**Table:** Fitting left/fitting right (indicates which fitting is used on both ends of the capillary)
Key	Description
W	Swagelok + 0.8 mm Port id
S	Swagelok + 1.6 mm Port id
M	Metric M4 + 0.8 mm Port id
E	Metric M3 + 1.6 mm Port id
U	Swagelok union
L	Long
X	Extra long
H	Long head
G	Small head SW 4
N	Small head SW 5
F	Finger-tight
V	1200 bar
B	Bio
P	PEEK
I	Intermediate

21-Jun-2025