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Flame-retardant grade

DSE's technology has been verified by thorough quality control and various certifications.

UL(Underwriters Laboratories)
Attainment of the safety UL standard is essential for an exterior material of electrical and electronic applications, and it is necessary to select a flame-retardant resin that meets the standards for materials used to manufacture product exteriors.

DSE HI BOX UL Certification List

Download DSE HI BOX UL Certification List

What UL does

• Establishment of safety standards
• Specification-based product testing
• Publication of test results (for insurance companies, government agencies, relevant organizations, and the general public)
• Follow-up Services (A/S)

UL Factors (Test Methods and Standards)

✔ T HB Test (Horizontal Burning Test)


• Horizontal Burning Test: Measurement of burning time (low flame-retardant materials)

- Specimen: 5" x 1/2' x thickness - 5 specimens
- Specimen Aging Condition: 230, RH 50%, 48 hours or more
- Flame: Methane gas finch Blue Flame Burner 45° angle


※ If the entire table is not visible, you can scroll the table left and right to check the entire table.

T HB Test
Flame retardancy Thickness 1/8° or more Thickness 1/8° or less
HB Burning speed 1.5 inch/min or less Burning speed 3.0 inch/min or less

✔ Vertical Test


• Vertical experiment's burning time measurement (applied to flame-retardant materials)

- Specimen Aging Condition: Same as HB Test
- Flame: Methane gas, blue color single flame height 3/4"
- Test method: The test involves bringing the specimen into contact with the flame for 10 seconds and this is done 5 times. In other words, after the specimen with the flame for 10 seconds, and then, when the burning flame is turned off, the specimen is brought back into contact with the flame for another 10 seconds. Repeat the same test 5 times.


※ If the entire table is not visible, you can scroll the table left and right to check the entire table.

Vertical Test
Classification V-0 V-1 V-2
1st and 2nd burning time of each specimen Within 10 seconds Within 30 seconds Within 30 seconds
The sum of the second burning time and the glowing time for each specimen Within 30 seconds Within 60 seconds Within 60 seconds
The total times of the first and second burns of the 5 specimens Within 50 seconds Within 250 seconds Within 250 seconds
Cotton prints due to falling flame Should not be Should not be Should not be

✔ 5V Test


• Applied to high flame-retardant resin

ⓐ Bar Test
- Specimen aging conditions are the same as in the HB Test
- Flame: Double flame (inner flame: 1.5 inch, outer flame: 5 inch)
- Test method: bring into contact with the flame for 5 seconds, remove flame for 5 seconds, and repeat 5 times

ⓑ Plaque Test
- Specimen: 6"x6" x thickness, 3 pieces
- Test method: bring into contact with flame for 5 seconds, remove flame for 5 seconds, and repeat 5 times


※ If the entire table is not visible, you can scroll the table left and right to check the entire table.

5V Test
Judgement criteria 5VA 5VB Remark
The sum of the burning time and glowing time 60seconds 60seconds -
sublimination or ignition status NO NO -
Whether there is a hole creation in the center of the specimen NO YES Plaque Test