石英とガラスのキュベットの比較: どちらを選ぶべきか？

1. The Short Answer

• Measure below 320 nm (UV)? → You need 溶融石英. Glass blocks UV light.
• Only visible 波長 (400–700 nm)? → Glass works, and costs a fraction of 石英.
• Not sure? → The 波長範囲 of your methods decides. DNA/RNA at 260 nm, proteins at 280 nm and most pharmaceutical assays all sit below 320 nm — that is why most labs end up with 石英.

Property	Fused 石英 (JGS1/JGS2)	Optical glass (K9 / borosilicate)
Transmission range	190 – 2500 nm	320 – 2500 nm
UV cut-off	~170 nm (JGS1)	~320 nm
Best for	DNA/RNA, proteins, kinetics, HPLC, UV-Vis	Visible colorimetry, education
Price	Higher	Low
Chemical resistance	Exセルent (except HF/strong alkali)	Good

2. Transmission Range: Why UV Decides Everything

Light absorption follows the 材質's transmission 窓. Fused 石英 (溶融シリカ) is transparent from ~190 nm in the deep UV through the visible to ~2500 nm in the near 赤外線. Borosilicate or optical glass (K9) cuts off sharply below ~320 nm — below that, the キュベット itself absorbs the light you are trying to measure, producing flat, meaningless readings.

Typical 波長 that force you into 石英:

• 260 nm — DNA/RNA quantification (NanoDrop-style methods)
• 280 nm — protein quantification
• 230 nm — peptide bonds, many pharmaceutical methods
• 200–220 nm — far-UV kinetics, nitrate/nitrite, many organic assays

If your lab only runs visible-range colorimetry (e.g. some water-quality tests, chlorine, copper), glass is a legitimate cost saver. Browse our glass キュベット for those workflows.

3. 材質 グレードs: It Is Not Just "石英 vs Glass"

石英 itself comes in グレードs, and knowing the difference avoids paying for performance you do not need — or missing performance you do:

グレード	UV cut-off	Typical use
JGS1 (far-UV グレード)	~170 nm	DNA/protein, anything below 220 nm — our 標準 for 10 mm セルs
JGS2 (UV グレード)	~200 nm	Routine UV-Vis above 200 nm
JGS3 (IR グレード)	Visible / NIR	Near-IR, high-temperature work
K9 / borosilicate	~320 nm	Visible-range colorimetry only

For any biochemistry or pharmaceutical application, choose JGS1 far-UV グレード. The premium over JGS2 is small compared with the cost of one failed assay. All our 標準 10 mm 石英キュベット are JGS1 as 標準.

4. When Glass Is Perfectly Fine

Do not buy 石英 for the sake of it. ガラスキュベット are the right tool when:

• All your 波長 are above 320 nm (visible colorimetry).
• You teach or demonstrate — breakage is cheap to replace.
• You need disposable-style 容積 workflows where cost dominates.
• You are screening many samples and only need semi-quantitative results.

Our glass キュベット range covers 標準 10 mm セルs and specialty formats for visible-light work.

5. Price: The Real Cost Difference

A 標準 10 mm glass キュベット may cost a few dollars; an equivalent JGS1 石英 セル from a factory-direct supplier typically runs several times more, and ブランドed German equivalents cost substantially more again. However, the price gap has narrowed — factory-direct 石英 from manufacturers like Scuvette is often 30–70% below distributor pricing for the same JGS1 グレード.

Rule of thumb: if even one method in your lab needs UV, 標準ize on 石英. Glass セルs become a second set for visible-only work, not the default.

6. Durability, Cleaning and Chemical Resistance

• Heat tolerance: 石英 withstands high temperatures (溶融シリカ up to ~1000°C continuous); glass softens far earlier. Relevant if セルs are autoclaved or used at elevated temperature.
• Cleaning: both survive routine acid/base and solvent cleaning. Never use hydrofluoric acid on 石英 — it etches silica. Strong hot alkalis also attack 石英 over time.
• Surface quality: 石英 is harder and less prone to fine scratches from routine wiping, which matters because scratched optical faces scatter light and raise baseline noise.

See our キュベットケアガイド for step-by-step cleaning and storage.

7. How to Tell Which キュベット You Already Have

Lab drawers are full of unlabelled セルs. Three quick checks:

1. The UV test: measure empty-セル absorbance at 260 nm (air reference). 石英 reads near zero; glass shows a large, rising absorbance below 320 nm.
2. The weight test: 石英 セルs feel noticeably heavier and denser than the same glass セル.
3. The marking test: quality セルs are laser-marked (e.g. "Q" or "10 mm"); glass セルs are often unmarked or printed.

8. Decision Checklist

1. Any measurement below 320 nm? → 石英 (JGS1 if below 220 nm).
2. Visible colorimetry only, cost-critical? → Glass is acceptable.
3. Autoclaving or high temperature? → 石英.
4. Long-term reproducibility (matched pairs)? → 石英, matched to ±0.01 mm.
5. Fluorescence? → 4-窓 石英 セル (glass autofluorescence ruins the reading). 蛍光キュベット →
6. Uncertain about your instrument? → Check our complete 石英キュベット購入ガイド or send us your model.