Product Overview

Core Product Strengths

1. One-Piece Stainless Steel Forming, Zero Dimensional Deviation
   Funnel body is integrally machined from solid stainless steel block without welding seams, the inner conical surface is polished smoothly to avoid powder adhesion and bridging during blanking. Measuring cups, support frames and leveling bases all use corrosion-resistant 304 stainless steel, long-term contact with pigments, fillers and moisture-containing powder will not rust or deform, maintaining standard size for years of continuous use.

   2.Dual Standard Matching For Different Particle Sizes

   KR-730A small funnel specification fits fine molding powder, carbon black powder and micro masterbatch; KR-730B large-diameter funnel is designed for plastic pellets, coarse resin particles and granular additives. The vertical gap between funnel outlet and cup mouth is fixed at the standard 38mm height, eliminating manual adjustment errors during daily testing.

   3.Stable Horizontal Calibration Base

   Four adjustable leveling foot pads plus built-in horizontal bubble gauge allow operators to quickly calibrate the whole frame to absolute horizontal state before each test, preventing uneven powder accumulation caused by tilted equipment and improving test result consistency between parallel samples.

   4.Complete Supporting Consumables & Tools

   Each complete set is equipped with standard test accessories including precision steel scraper, cleaning brush and stopwatch, no extra auxiliary tools need to be purchased separately. The scraper edge is processed flat to quickly scrape excess powder above the cup mouth for accurate volume weighing.

   5.Simple Operation, Low Technical Threshold

   The gravity blanking principle requires no power supply or complex electronic control modules. New operators can master the complete test flow within 5 minutes, suitable for high-frequency daily incoming QC inspection and mass formula screening work.

   6.Expandable Method C Test Kit

   Optional Method C auxiliary assembly including 1000ml measuring cylinder, compression weight and lead shot, specially for fluffy flakes, chopped fiber and large-size plastic fragments that cannot pass through A/B funnel apertures, realizing full ASTM D1895 standard coverage on one set of equipment.

Full Technical Specification Table

KR-730A (ASTM D1895 Method A for Fine Powder)

KR-730B (ASTM D1895 Method B for Coarse Granules)

Optional Method C Supporting Parts

ASTM D1895 Method C

Test Method C (see FIG. 3) covers the measurement of the apparent density of materials supplied in the form of coarse flakes, chips, cut fibers, or strands. Such materials cannot be poured through the funnels described in Test Methods A and B. Also, since they ordinarily are very bulky when loosely poured and are usually compressible to a lesser bulk, even by hand, a measure of their density under a small load is appropriate and useful.

Standard Complete Test Operating Process

1. Horizontal Calibration
   Adjust four base foot pads and observe the horizontal bubble until centered, fix the measuring cup at the central position directly below the funnel outlet.
2. Sample Filling Preparation
   Block the funnel discharge hole temporarily, pour fully dried plastic powder/granules into the upper funnel cavity to avoid material agglomeration caused by moisture.
3. Gravity Free-Fall Filling
   Quickly release the blanking baffle, let the sample naturally fall and fill the measuring cup completely without artificial vibration or compaction.
4. Volume Trimming
   Use the matched steel scraper to flatly scrape off the excess material piled above the cup mouth, keep the powder surface flush with the cup edge.
5. Weighing & Index Calculation
   Transfer the full measuring cup to high-precision analytical balance to record total mass, subtract empty cup weight to get net sample mass, then calculate apparent bulk density (mass/standard volume) and bulk factor value.
6. Equipment Cleaning
   Brush residual powder off funnel inner wall and measuring cup surface with the special cleaning brush, store the fixture in a dry dust-proof environment after testing.

What Is The Use Of Bulk Density Apparatus?

Wide Industrial Application Scenarios

Plastic Resin & Masterbatch Factories

Powder Coating & Pigment Enterprises

New Energy & Composite Material Labs

Third-Party Quality Inspection Institutions

Rubber & Thermoset Material Workshops

Standard Factory Delivery Kit

1. KR-730A / KR-730B main stainless steel test stand (funnel + measuring cup + support frame)
2. Adjustable leveling base with horizontal bubble gauge
3. Standard steel scraping ruler, dedicated cleaning soft brush
4. Precision stopwatch for blanking flow timing
5. Multilingual operation guide aligned with ASTM D1895 & ISO R60
6. Factory dimensional calibration inspection certificate
7. Optional Method C full test auxiliary assembly (separate configuration)