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Knowledge of carton packaging: What is Box Maker's Certificate

  • source:Angela Yin
  • Time:12/06/2023

The Box Maker's Certificate (also named as box manufacturer certificate) is a stamp or label commonly found on corrugated boxes that provides important information about the box's construction and strength. The certificate indicates that the box conforms to certain standards set by organizations such as the International Safe Transit Association (ISTA) or the American Society for Testing and Materials (ASTM). The BMC is particularly relevant for shipping and packaging industries where the integrity of a box during transit is critical.


The BMC is a quality assurance mark that proves that the various physical properties of the current carton meet or exceed the index stated on the quality assurance seal. Its function is to illustrate The current cartons meet the transportation requirements and are suitable for transportation.


Strictly speaking, the carton quality assurance seal is only a stipulation on the physical properties of the carton, not the entire quality. For example, it does not include printing graphics and text effects, size specifications, waterproof and moisture-proof properties, etc.


Box Maker Certificate mark


The Box Maker's Certificate includes the following information:


Box Manufacturer: This identifies the company that produced the box. It may include the manufacturer's name, logo, or a specific code that can be traced back to the company. This information is crucial for accountability and quality assurance purposes.


Board Construction: This describes the type of corrugated board used to make the box. It indicates the flute size (e.g., A, B, C, E, or F flutes) and the number of walls (single-wall, double-wall, or triple-wall). Flute size affects the box's stacking strength and insulation properties, while the number of walls impacts the overall durability and protective qualities of the box.


Bursting Test: Also known as the Mullen Test, this is a measure of the box's resistance to rupture under pressure. The result is expressed in pounds per square inch (psi). A higher bursting test value indicates a stronger box that can withstand more internal or external force without failing.


Minimum Combined Weight Facings: This refers to the combined weight of the linerboard materials used on the inner and outer facings of the corrugated board. It is measured in pounds per thousand square feet (MSF). This weight influences the box's puncture resistance and overall strength.


Size Limit: This specifies the maximum external dimensions a box can have (length, width, and depth) to maintain its certification. It ensures that the box's size is appropriate for the strength characteristics indicated on the BMC.


Gross Weight Limit: This is the maximum weight the box is certified to hold and transport safely. It is an important consideration for shippers to prevent overloading and potential box failure.


City & State: This indicates the location of the manufacturing facility where the box was produced. This can be relevant for tracing the source of the boxes and for logistical considerations.

Significance of the Box Maker's Certificate


  1. Quality Assurance:

    • The BMC ensures customers and end-users that the box meets industry standards for strength and durability, protecting contents during shipping and handling.
  2. Regulatory Compliance:

    • Many shipping carriers and regulatory bodies require the presence of a BMC on boxes to ensure compliance with safety and quality standards, minimizing damage and loss during transit.
  3. Informed Decision Making:

    • Provides essential information for businesses to select the appropriate box for their shipping needs based on the weight and nature of the contents, ensuring safe transport.
  4. Consistency and Standardization:

    • The BMC ensures that boxes are manufactured consistently according to standardized tests and measurements. This uniformity is vital for maintaining quality across different batches and manufacturers.


Parameter standards of the BMC


Single-wall corrugated fiberboard boxes

Gross Wt.Lt(Lbs) Size Limit (in)

Min comb wt Facings

Lbs/M sq.ft(g/m2)

Bursting Test(Lbs/sq.In) ECT(Lbs/In)
20 40 52(254) 125 23
35 50 66(322) 150 26
50 60 75(366) 175 29
65 75 84(410) 200 32
80 85 111(542) 250 40
95 95 138(674) 275 44
120 105 180(879) 350 55









Double-wall corrugated fiberboard boxes


Gross Wt.Lt(Lbs) Size Limit (in)

Min comb wt Facings

Lbs/M sq.ft(g/m2)

Bursting Test(Lbs/sq.In) ECT(Lbs/In)
80 85 92(449) 200 42
100 95 110(537) 275 48
120 105 126(615) 350 51
140 110 180(879) 400 61
160 115 222(1084) 500 71
180 120 270(1318) 600 82








Triple-wall corrugated fiberboard boxes


Gross Wt.Lt(Lbs) Size Limit (in)

Min comb wt Facings

Lbs/M sq.ft(g/m2)

Bursting Test(Lbs/sq.In) ECT(Lbs/In)
240 110 168(820) 700 67
260 115 222(1084) 900 80
280 120 264(1289) 1100 90
300 125 360(1758) 1300 112








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