Semi-finished components
Start from a formed body, not from tube
If you fabricate laboratory glassware, you probably start with tubing and blow every shape yourself. There is another way to begin. A blank is a semi-finished piece — the body already blown to shape, annealed and dimensionally controlled — so your bench work starts at the neck, the joint or the finish rather than at the bottom of the flask.
The idea
Where your work begins
The difference is not the finished article — it is which forming steps you own. Buying blanks removes the steps that are hardest to keep consistent, and leaves the steps where your own specification matters.
Route A
Starting from tubing
The usual approach in most workshops.
- Cut and clean the tube
- Blow the bottom and form the body
- Control wall thickness and roundness
- Anneal
- Form the neck, joint or thread
- Finish and inspect
Every body depends on the operator. Scrap and wall-thickness variation land on you.
Route B
Starting from a blank
Steps 1–4 arrive already done.
- Cut and clean the tube
- Blow the bottom and form the body
- Control wall thickness and roundness
- Anneal
- Form the neck, joint or thread
- Finish and inspect
Your finishing work and your specification stay with you. Only the repetitive forming moves upstream.
Why it is worth it
What you actually gain
01 / CONSISTENCY
Same body, every lot
Bodies are formed on production tooling from our own H‑32 borosilicate tubing, so capacity, maximum diameter and effective height stay within the same envelope lot after lot.
02 / SKILL
Less dependence on one person
Blowing a consistent round bottom is the step that takes years to master. Removing it means output no longer tracks who is at the bench that day.
03 / MATERIAL
One glass, end to end
Blanks are H‑32 borosilicate (α = 32 × 10−7/K), the same material we melt and draw ourselves. No mixing of glasses with different expansion when you seal on your own parts.
Range
33 blank types
Grouped by availability. Capacities and dimensions vary by type — the full size tables, with neck diameter, maximum diameter, effective height and pieces per case, are on the Japanese page linked below. Tell us the type and capacity and we will quote in English.
| Blank | Japanese | Range | |
|---|---|---|---|
| Held in stock STOCK | |||
 | Erlenmeyer flask body | 三角フラスコ | 50 – 3000 mL |
 | Separatory funnel body (type N) | 分液ロート（N形） | 7 sizes |
 | Squibb separatory funnel body | スキーブ分液ロート | 8 sizes |
 | Pear-shaped flask body (type N) | なすフラスコ（N形） | 8 sizes |
 | Pear-shaped flask body | なすフラスコ | 4 sizes |
 | Pear-shaped flask body, heavy wall | なすフラスコ（肉厚） | 8 sizes |
 | Round-bottom flask body, wide neck | 丸底フラスコ（太首） | 4 sizes |
 | Round-bottom flask body, narrow neck | 丸底フラスコ（細首） | 7 sizes |
 | Three-neck round-bottom flask body | 丸底フラスコ（三頭） | 9 sizes |
 | Soxhlet extraction flask body | ソックスレフラスコ | 1 size |
 | Solid stopcock plug blank | ムク栓生地 | 8 sizes |
 | Stopcock plug blank, bored (two-way) | ムク栓生地 穴空き | 3 sizes |
| Made to order | |||
 | Filtering (suction) flask body | 吸引瓶（ロカ瓶） | 3 sizes |
 | Wash bottle body, footed & fire-polished | 洗浄瓶（台付・口焼品） | 3 sizes |
 | Separable flask body Φ75 | 丸底セパフラスコ Φ75 | 4 sizes |
| Separable flask body Φ85 | 丸底セパフラスコ Φ85 | 5 sizes |
| Separable flask body Φ100 | 丸底セパフラスコ Φ100 | 3 sizes |
| Separable flask body Φ120 | 丸底セパフラスコ Φ120 | 3 sizes |
 | Three-neck round-bottom body, narrow neck | 丸底フラスコ（三頭・細首） | 1 size |
 | Separable flask cover | セパラブル用カバー | 4 sizes |
 | Separable flask cover, grooved (type N) | （N型）セパラブルカバー | 2 sizes |
 | Buchner funnel body | ロート（ブフナー用） | 2 sizes |
 | Grooved funnel body | ロート（溝付） | 4 sizes |
 | Flange | フランジ | 1 size |
| Custom order | |||
 | Round-bottom flask body | 丸底フラスコ | 4 sizes |
 | Erlenmeyer flask body with TS joint | 三角フラスコ（TS） | 5 sizes |
 | Pear-shaped flask body with TS joint | なすフラスコ（TS） | 3 sizes |
 | Separatory funnel body with TS joint | 分液ロート（TS） | 6 sizes |
 | Kjeldahl flask body, long neck | ケルダールフラスコ | 2 sizes |
 | Reagent bottle body | 保存瓶 | 4 sizes |
 | Ball-type glass stopper blank | 玉栓・カルシューム栓 | 5 sizes |
 | Stopper blank for narrow-mouth bottle | 細口瓶栓 | 3 sizes |
 | Distilling adapter blank | タコ足 | 2 sizes |
“TS” denotes a standard taper ground joint. Type N indicates our N-form profile. Blanks are supplied unfinished: necks, joints, threads, graduation and printing are yours to complete.
Ordering
How supply works
- Minimum order
- By the case. Pieces per case depend on the size — larger bodies come fewer to a case. We will confirm the exact case quantity for the types you are interested in.
- Export
- Available. We ship overseas and can issue English invoices, packing lists and the documentation your customs process requires.
- Freight
- Blanks are bulky and fragile relative to their value, so freight matters more than it does for small parts. Consolidating types and sizes into one shipment is usually the difference between workable and not — tell us your full list and we will work out the most efficient way to pack it.
- Lead time
- Stock types ship soonest. Made-to-order and custom types are produced against your order; we confirm the schedule when we quote.
- Beyond the list
- If the body you need is not here, it becomes a custom forming inquiry. Send a drawing or a description of the finished article and we will tell you whether it is feasible — see OEM & custom glass.
Tell us which bodies you blow most often
The types you make repeatedly are the ones where blanks pay off first. Send us the shapes and capacities you go through in a year, and we will come back with case quantities, a quotation and a realistic view of the freight.