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UL94 Test for flammability
At DJK Corporation, we provide services for the UL94 test for flammability.
The flammability test is performed mainly for the listing and recognition of the UL mark.
By acquiring the UL mark your product is guaranteed for public safety which meets the standards of UL (Underwriters laboratory) which is a non-profit organization dedicated to public safety.
We concentrate on the flammability test for polymer materials used to construct parts in devices and appliances.
The test for flammability is categorized into 5 types of tests.

  1. Horizontal burning test: also know as the HB test
  2. Thin material vertical burning test: categorized as VTM-0,VTM0-1, VTM-2
  3. Vertical burning test: categorized as V-0, V-1, V-2
  4. Horizontal Burning Foamed Material Test: categorized as HBF, HF-1, HF-2
  5. 500W vertical burning test: categorized as 5VA and 5VB

These tests measure the characteristics of the material in time, condition and texture it burns.
As a result UL authorizes if the material is safe enough to be used in the end product to sell in the market.
The UL94 test for flammability is also available from our partner company STR based in Connecticut as the ATDP test (Agent test data program).
When urgent testing is needed this program is very helpful.
Horizontal Burning Test

UL1446@Insulation System
The UL 1446 is a standard of evaluation test method using upper bound temperature as the system is reviewed.
The electrical insulation system is a collection of materials that, when used together, has an established thermal class rating and the materials fall into three areas: conductors, major insulation components and minor components.
The demand in recent electronic components in high temperature for a product is now a must.
This standard is evaluated as a system that composes material that make up components such as, Plastic, Magnet wire, Insulating film, Tape, Varnish, etc. in certificated testing such as the transformer, motor, solenoids, and generators.
If it doesn't meet this standard even if the Plastic takes a temperature rating more than the 746B regulation, it is not possible to use it for these products in the temperature of 120 or higher. The composition material is divided into two.
Major components:
Plastic, Magnet Wire, and insulating film
Minor components:
Tape, cord, lead wire, potting material, varnish The system model composed of these components is heated with the heat aging test at three temperatures.
By using the control of the certificated system temperature rating,
UL decides the temperature rating from the differences below.
The system temperature ratings: 120,130,155,180,200,220,240
The advantage for the Plastic manufacturer for obtaining the system recognition is that when the component supplier submits the components, the Plastic manufacturer obtains recognition short-term at a low price by the shield tube test.
If any company wants to try UL1446, we recommend the examination with STR based on experience, technology, and knowledge.


Analytical service on RoHS/ELV regulation substance

The substances to be analyzed are Cadmium, Lead, Mercury, Hexavalent chromium, and specific brominated flame retardants. If you have any interests, please contact DJK at your convenience.