Specifications

Fritted Crucible · Specifications

Standard specifications are listed below. Fritted disc grades cover G0~G6 full range (including G1A and G4A intermediate grades). Custom capacities and fritted disc grades available upon request.

Request custom specs

I. Fritted Disc Grade Guide (ISO/Original Standard)

Note: The following follows the industry-standard ISO/Original Standard classification system. Commercial systems (e.g., from brands like SunSig or some professional brands) may differ. G1A and G4A are intermediate grades offering finer pore size selection.

ISO	Original	Pore Size (μm)	General Use
P250	C00	160-250	Coarse particle precipitation
P160	G0	100-160	Coarse particle filtration, coarse gas distribution
P100	G1A	70-100	Water treatment
P70	G1	50-70	Large precipitates and colloidal precipitates
P50	G2	30-50	Gas washing, large precipitate filtration
P30	G3	16-30	Fine precipitate filtration, mercury filtration
P16	G4A	7-16	Fine particle filtration, fine gas distribution
P7	G4	4-7	Very fine precipitate filtration
P4	G5	2-4	Ultrafine particle filtration, large bacteria
P2	G6	1.2-2.0	Bacterial filtration (E. coli and Staphylococcus)

* Source: Industry-standard ISO/Original Standard classification system

II. Chinese National Standard (GB/T) System

Grade	Pore Size (μm)	General Use
G1	20~30	Coarse precipitates and colloidal precipitates
G2	10~15	Coarse precipitates, gas washing
G3	4.5~9	Fine precipitates, mercury filtration
G4	3~4	Very fine precipitates
G5	1.5~2.5	Large rod-shaped bacteria and yeast
G6	<1.5	1.5~0.6μm bacteria (discontinued by some manufacturers)

* Source: GB/T 28211-2011 related standards

III. Fritted Disc Grade Classification

Category	Grades	Pore Size Range	Applications
Gas Treatment	G0, G1A, G1, G2	30~160μm	Suitable for coarse precipitate filtration and washing
Chemical Analysis	G3, G4, G4A	4~30μm	Suitable for fine precipitate filtration in general chemical analysis — gravimetric analysis, crude fiber determination (G3~G4)
Bio/Pharma	G5, G6	1.2~4μm	Suitable for ultrafine precipitate filtration and sterile filtration

IV. Capacity Options

Size Category	Common Capacities (ml)
Micro	2, 5, 10
Small	15, 25, 30
Medium	40, 50, 60, 100

V. Fritted Crucible vs. Fritted Funnel

Feature	Fritted Crucible	Fritted Funnel
Core Function	Filtration + Drying + Weighing	Routine filtration, suction
Typical Use	Gravimetric analysis, ash determination, crude fiber	Liquid filtration, solid-liquid separation
Capacity Range	2ml ~ 100ml	2ml ~ 20000ml
Temperature	< 500°C (drying/weighing)	Routine filtration temperatures

* Custom capacities and fritted disc grades available.
* Complies with GB/T 28211-2011 standards.
* For bulk customization, please contact our sales team for MOQ and lead time.

✦ Custom Services — Non-standard capacities, fritted disc grades, and overall dimensions available. Contact us with your specific requirements and our technical team will provide a tailored solution.

Product Description

The fritted crucible (also known as a Gooch crucible with fritted disc or sintered glass crucible) is a specialized glass instrument for gravimetric analysis, microanalysis, and chemical analysis — designed for the filtration, washing, drying, and weighing of precipitates. Made from high-quality borosilicate glass 3.3 with a sintered glass frit, it offers excellent chemical resistance, thermal shock resistance, and filtration efficiency.

The key design advantage of the fritted crucible is its combined filtration + drying + weighing capability: precipitates can undergo the entire process from filtration and washing to drying and weighing within the same crucible, eliminating sample loss from transfer and improving analytical accuracy. Fritted disc grades cover the G0~G6 full range (including G1A and G4A intermediate grades), suitable for different types of precipitates.

✦ Key Advantages: Compared to standard paper filtration, fritted crucibles offer superior chemical resistance — capable of filtering acids and other corrosive systems. Precipitates are dried and weighed directly in the crucible without transfer, eliminating sample loss. Uniform pore size ensures high filtration efficiency. Reusable with proper cleaning, offering long service life.

Key Features

Borosilicate Glass 3.3: Low thermal expansion, chemical resistance, thermal shock resistance
Sintered Fritted Disc: Uniform pore size, G0~G6 full range (including G1A and G4A)
Filtration + Drying + Weighing: Combined operation eliminates sample transfer loss
Acid-Resistant: Suitable for filtering acids and corrosive reagents
Wide Size Range: Capacities from 2ml to 100ml
Reusable: Can be cleaned and reused — economical and environmentally friendly

Quality Assurance

Every fritted crucible undergoes rigorous pore size inspection, visual inspection, and material testing to ensure the frit is intact, unclogged, and has uniform pore size. Bulk orders support custom fritted disc grades and capacities — welcome to inquire.

Tip: Inspect the fritted disc for cracks or clogging before use. Clean immediately after use to prevent residue from blocking the frit pores. Maximum working temperature is 500°C — do not subject to high-temperature ashing.

Applications

Typical Applications

Gravimetric Analysis

Filtration, washing, drying, and weighing of precipitates in quantitative analysis

Ash Determination

Ash content determination in food, feed, and pharmaceuticals

Crude Fiber Determination

Crude fiber analysis in feed and food (GB/T 6434-2022)

Microanalysis

Filtration and weighing of small-volume samples

Environmental Monitoring

Suspended solids filtration and weighing in water samples

Teaching Labs

Analytical chemistry laboratory education

Applicable Standards

GB/T 28211-2011
GB/T 6434-2022
ASTM E438

Tip: Pre-treat new crucibles by suction filtration with hot hydrochloric acid or chromic-sulfuric acid, rinse with distilled water, and dry before use. Maximum working temperature is 500°C — do not subject to high-temperature ashing.

Operation & Maintenance