What is an alumina crucible with hole used for?

It carries a sample or powder through a tube furnace or lab furnace, and the hole does a job set by the design — gas entry, venting, positioning or draining. Buyers also call it an alumina boat with hole. Common work includes combustion elemental analysis, calcination and ashing.

Is an alumina crucible with hole suitable for CHN elemental analysis?

Elemental analyzers burn the sample in a ceramic boat inside a tube furnace, so labs do source alumina boats for this work. Suitability is confirmed per project: send the analyzer model, the old part or its original part number, the sample amount and the oxygen conditions, and check the first part in your instrument.

Can it be used for ashing or powder calcination?

Alumina boats are used to carry powders and solids through ashing and calcination. Send the sample form, fill amount, peak temperature and atmosphere. Grade, wall thickness and whether a hole is needed are then chosen against those conditions rather than assumed.

What temperature can an alumina crucible with hole withstand?

The material service temperature guide ranges from 1400 °C for AD-ALU-950 to 1750 °C for AD-ALU-999. A finished crucible's limit also depends on wall thickness, hole design, sample, atmosphere and heating rate, so we review your heating cycle before recommending a grade.

How do I select the right size?

Start with your furnace or holder: measure the tube inside diameter, usable hot-zone length and loader clearance. Then find a model number by L × W × H, or send a maximum envelope. The 26 listed sizes run 70–300 mm long, 10–84 mm wide and 10–35 mm high.

Can I order a custom hole diameter, hole count or hole position?

Hole count, diameter, position, direction and edge finish can be made to your drawing. We check the wall thickness around the hole and confirm what the drawing should show before quoting, so the part can be inspected the same way it was defined.

Will it fit my analyzer or tube furnace?

We confirm fit per project, not by name. Send your equipment model, the old part or its original part number, and the furnace tube inside diameter. A matching outer size is a starting point. Final fit is checked with a sample in your equipment.

Alumina Crucible with Hole | Boat Sizes & Custom RFQ

What Is an Alumina Crucible with Hole?

An alumina crucible with hole is a boat-shaped sample holder made of alumina ceramic (Al₂O₃), with one or more holes in the end, side wall or base. Users often call it an alumina boat with hole. The hole's job — gas entry, venting, positioning, draining or another purpose — depends on your drawing, equipment and test method.

Boat-shaped crucible with a hole

A boat-shaped alumina crucible with a hole, found by model number or outer size, or made to your drawing or old part.

Combustion method questions

For combustion-tube conditions and analyzer interface checks, see the alumina combustion boat with hole.

A different vessel

For boats without a hole, see alumina boats. For round or deep vessels, see alumina crucibles.

Alumina Crucible with Hole Specifications

The table lists 26 model numbers of boat-shaped alumina crucibles with their outer length (L), width (W) and height (H) in millimeters. Use it to find your model number or to check whether a size fits your furnace tube, hot zone or sample holder.

Item NO.	length (mm)	width (mm)	height (mm)
TE-AS-071	100	84	35
TE-AS-072	100	56	35
TE-AS-073	100	43	26
TE-AS-074	100	27	27
TE-AS-075	100	24	17
TE-AS-075-1	100	20	20
TE-AS-075-2	100	27	27
TE-AS-075-3	103	28	30
TE-AS-075-4	100	43	25
TE-AS-075-5	100	24	17
TE-AS-075-6	100	27	25
TE-AS-075-7	100	43	26
TE-AS-075-8	100	56	35
TE-AS-075-9	100	50	35
TE-AS-075-10	100	56	35
TE-AS-076	73	30	22
TE-AS-076-1	73	30	22
TE-AS-076-2	70	30	22
TE-FA-001	300	70	30
TE-FA-002	200	80	35
TE-FA-003	200	11	12
TE-FA-004	105	23	20
TE-FA-005	100	30	25
TE-FA-006	90	10	10
TE-FA-007	80	30	20
TE-FA-008	88	12	10

A model number and its outer size do not by themselves define the hole, cross-section, inside space, grade or stock status. Those are confirmed in the quote.

Defined by your drawing or old part

Item	What to specify	Why it matters
Outer size	L × W × H and tolerance	Fit in the furnace tube, hot zone or loader
Inside space	Inside length, width, depth and corner radius	Sample amount and fill height
Wall and base	Wall thickness, base thickness, rim and end shape	Strength near the hole and heat-up behavior
Hole	Count, diameter, center position, axis direction, through or blind, edge finish	Gas path, venting, positioning or draining
Loading	Loading direction, push rod or fixture contact, lid if any	Smooth insertion and removal
Grade	Alumina grade and contamination limits	Sample compatibility and blank values

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Alumina Ceramic Boats with Hole Properties

The values below are typical data for six dense sintered alumina grades. They help you choose a grade. They are not a rating for a finished crucible, because hole size, wall thickness, sample, atmosphere and heating cycle all change how the part behaves.

Property	Unit	AD-ALU-999	AD-ALU-997	AD-ALU-995	AD-ALU-990	AD-ALU-960	AD-ALU-950
Al₂O₃ content	Wt%, nominal	99.90	99.70	99.50	99.00	96	95
Bulk density	g/cm³	3.94	3.94	3.90–3.92	3.80–3.91	3.70	3.75
Flexural strength	MPa, 20 °C	315–340	330	320–350	300–320	300	280
Thermal conductivity	W/(m·K)	35–42 at 25 °C	35–40 at 25 °C	30–38 at 25 °C	24 at 25 °C	25 at 20 °C	18–25 at 25 °C
Thermal expansion	10⁻⁶/K	7.6 (25–800 °C)	7.6 (25–800 °C)	7.6 (25–800 °C)	7.2 (25–800 °C)	8.2 (25–1000 °C)	7.6 (25–800 °C)
Water absorption	%	≤0.01	≤0.05	≤0.10	≤0.10	≈0	≤0.20
Service temperature guide	°C, depends on use	1750	1700	1650	1600	1600 max. in air	1400
Color	—	Ivory	Ivory	Ivory	Ivory	White	Ivory / white

Typical values, not batch test results or guaranteed minimums. Test methods and report conditions can be agreed in the quote.

How to Choose an Alumina Crucible with Hole

Fit. Measure the furnace tube inside diameter, hot zone length and loader clearance. Pick a model number or give a maximum L × W × H.
Hole. Decide what the hole must do. Mark the hole count, diameter, position and direction on your drawing or old part.
Sample. Note the sample type, amount and any flux or additive. Check whether it can melt, stick or flow into the hole.
Heating cycle. Give the peak temperature, hold time, heating and cooling rates, atmosphere and gas flow.
Grade and checks. Choose a grade by your contamination limit. Agree on the dimensions and hole checks for the first sample order.

Material	General strengths	General limits
Alumina ceramic	High service temperature, hard, chemically stable with many oxide samples	Can crack under fast temperature change; some fluxes and alkaline melts attack it
Fused quartz	Very good thermal shock resistance, clear, low metal content	Lower service temperature than alumina; softens and can devitrify at high heat
Metal boats (e.g. nickel alloy)	Not brittle, easy to handle	Oxidizes at high temperature; can react with or add metals to the sample

Packaging for Alumina Ceramic Crucibles with Hole

Individual protection: each crucible and lid separated to prevent chipping during transit
Foam + carton structure: rigid cushioning around rims and lids (common damage points)

Alumina Boats with Hole Packaging

Applications of Alumina Crucibles with Holes

Combustion elemental analysis

Carbon, sulfur and similar analyzers often load samples in a ceramic combustion boat inside a horizontal tube furnace. Labs use this page to replace or second-source a sample boat. Send the analyzer model, your old part or its original part number, sample weight and oxygen conditions. Fit is confirmed by a sample trial.
Instrument and fixture design

Instrument makers and application engineers need a ceramic sample boat that matches a furnace tube, push rod, fixture or auto-loader. Send a 2D or 3D drawing with hole position, end shape and contact surfaces. We review whether the design can be made and how it will be checked.
Tube furnace work: calcination and ashing

Materials R&D and QC labs load powder or solid samples for calcination, ashing and heat treatment. Tell us the furnace, sample, fill amount, peak temperature, atmosphere and whether a hole is needed. Grade and shape are confirmed against those conditions.

Not the right fit: miniature pierced crucibles for TGA or DSC sensors are a different part. See the TGA alumina crucible or DSC alumina crucibles .

Usage Instructions for Alumina Ceramic Boat with Hole

Before first use

1. Check the rim, ends and hole edge for chips or cracks. Do not use a cracked part.
2. Test-fit the crucible in the furnace tube or loader at room temperature.
3. If your method needs a low blank, preheat the empty crucible with your normal cycle first.
Loading and heating

1. Keep the sample away from the hole unless your method calls for it. Do not overfill.
2. Use a heating and cooling rate your method allows. Fast temperature change is the main cause of cracks.
3. Load and remove at the temperature your procedure sets. Avoid placing a cold crucible into a hot zone unless it has been tested.
4. Handle with clean tongs or a push rod on the marked contact surfaces.
Storage

1. Remove loose residue after the crucible cools. Clear the hole with a non-metal tool.
2. Use a cleaning method that matches the residue and your contamination limits. Rinse and dry fully before reheating.
Cleaning

1. Let the boat cool gradually before handling; avoid rapid quenching.
2. Remove residues with non-metal tools to protect rim and hole edges.
3. If chemical cleaning is used, validate compatibility with your analytical background limits before routine adoption.
Storage and when to discard

1. Store dry and separated, so hole edges and rims do not touch.
2. Replace the crucible if you see cracks, chipped hole edges, a blocked hole that will not clear, warping, or blank values drifting out of your limit.

Common failure modes and how to reduce them

Failure	Typical cause	What to specify or do
Crack at the hole edge	Thin wall near the hole, stress at sharp edges, fast temperature change	Set a minimum wall around the hole, an edge chamfer and a heating rate limit
Thermal shock crack	Loading or removing the crucible while the furnace is hot	Define loading and removal temperatures; preheat if your method allows
Clogged or covered hole	Fine powder, melting sample or flux flowing into the hole	Review hole position against fill height and sample form; trial with the real sample
Sample sticking or reaction	Flux, alkaline or metal melts reacting with alumina	State the sample and additives; test with the real sample, or consider another material
Chipped rim or end	Push rod or tongs contact, packing damage	Mark contact surfaces; agree on edge protection in packing
Warping or poor fit	Long, thin designs under high heat and load	Give flatness and fit checks; confirm length-to-wall ratio in review
Blank drift in analysis	Residue from prior runs or trace elements in the grade	Define cleaning, preconditioning and when to discard a used part

Alumina Crucible with Hole FAQ

What is an alumina crucible with hole used for?
It carries a sample or powder through a tube furnace or lab furnace, and the hole does a job set by the design — gas entry, venting, positioning or draining. Buyers also call it an alumina boat with hole. Common work includes combustion elemental analysis, calcination and ashing.
Is an alumina crucible with hole suitable for CHN elemental analysis?
Elemental analyzers burn the sample in a ceramic boat inside a tube furnace, so labs do source alumina boats for this work. Suitability is confirmed per project: send the analyzer model, the old part or its original part number, the sample amount and the oxygen conditions, and check the first part in your instrument.
Can it be used for ashing or powder calcination?
Alumina boats are used to carry powders and solids through ashing and calcination. Send the sample form, fill amount, peak temperature and atmosphere. Grade, wall thickness and whether a hole is needed are then chosen against those conditions rather than assumed.
What temperature can an alumina crucible with hole withstand?
The material service temperature guide ranges from 1400 °C for AD-ALU-950 to 1750 °C for AD-ALU-999. A finished crucible's limit also depends on wall thickness, hole design, sample, atmosphere and heating rate, so we review your heating cycle before recommending a grade.
How do I select the right size?
Start with your furnace or holder: measure the tube inside diameter, usable hot-zone length and loader clearance. Then find a model number by L × W × H, or send a maximum envelope. The 26 listed sizes run 70–300 mm long, 10–84 mm wide and 10–35 mm high.
Can I order a custom hole diameter, hole count or hole position?
Hole count, diameter, position, direction and edge finish can be made to your drawing. We check the wall thickness around the hole and confirm what the drawing should show before quoting, so the part can be inspected the same way it was defined.
Will it fit my analyzer or tube furnace?
We confirm fit per project, not by name. Send your equipment model, the old part or its original part number, and the furnace tube inside diameter. A matching outer size is a starting point. Final fit is checked with a sample in your equipment.

Catalog No.	TE-AS-117-2
Material	Alumina ceramic (Al₂O₃), dense sintered
Purity	95% / 96% / 99% / 99% / 99% / 99.9%
Density	3.7–3.94 g/cm³
Dimensions/Sizes	Download PDF

Alumina Ceramic Boats / Boat-Shaped Crucibles with Hole