Sample loops for HPLC and GC injectors are used to deliver accurate, reproducible injection volumes into chromatographic systems. This category includes PEEK and stainless‑steel sample loops manufactured with tight dimensional tolerances to support analytical and preparative chromatography applications.
Injection precision depends heavily on tubing accuracy, end finishing, and connection integrity. Properly manufactured sample loops help minimize volume deviation and dead volume, contributing directly to method reproducibility and data quality.
PEEK Sample Loops (Ultra‑T™ Tubing)
PEEK sample loops are manufactured using Ultra‑T™ PEEK tubing, produced with some of the tightest dimensional tolerances available:
OD and ID tolerance: ± 0.025 mm
Common competitor tubing tolerances: ± 0.05 mm
This tighter control significantly reduces potential loop‑volume variation, supporting more consistent injections.
Key characteristics:
Available in volumes up to 20 µL
Manufactured for minimal volume deviation
Supplied with 1/32″ threaded nuts as standard
1/16″ and 1/4‑28 threaded connections available by special request
PEEK loops are commonly selected for bioinert or metal‑free workflows.
Stainless‑Steel Sample Loops
Stainless‑steel sample loops are manufactured using welded and annealed tubing that is tested in accordance with EN 10204 / 3.1B material certification standards.
Tubing is cut using electronic discharge cutting (EDC) techniques to produce:
Square, burr‑free ends
Zero‑dead‑volume connections
Key characteristics:
OD and ID tolerance: ± 0.025 mm
Excellent pressure resistance and durability
Supplied with 1/32″ threaded nuts and ferrules as standard
1/16″ threaded configurations available by special request
Stainless‑steel loops are typically used in high‑pressure or robust routine applications.
Volume Availability & Custom Configurations
Standard loop volumes are offered for common injection requirements. Additional volumes or custom configurations may be available upon request.
Volume Accuracy Consideration
Important note: Reported sample loop volumes are very close to nominal values. However, small variations in tubing internal diameter can occur, and absolute volume cannot be guaranteed.
For applications where minor volume differences are critical, it is recommended to calibrate sample loops prior to use.
Applications & Use Cases
Sample loops in this category are commonly used for:
HPLC analytical injections
GC injector configurations
Method development and validation
Bioanalytical and pharmaceutical workflows
Preparative and semi‑preparative chromatography
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