Second, the test method Place a heat source on one side of the test sample and place a copper calorimeter on the other side. Start the test and the sample clip is pushed into place. When the sensor value reaches the endurance limit of the second grade burn (the sensor temperature rises 35°C to 40°C), remove the sample clip from the heat source. From the intersection point of the response curve and the human tissue tolerance curve, the time for the second-degree burn was read to the nearest 0.1 second.
Third, the main technical indicators 1, the use of computer control, test results printout.
2, heat source heat flux: 50kw/m2 ~ 100kw/m2 adjustable.
3, heat source accuracy: ± 2%
4, calorimeter measurement range: 0 °C ~ 1600 °C ± 0.5 °C
5, the sample size: 150 × 150mm
6, power supply: AC220V50Hz4kW
Fourth, the applicable national standard GB8965.1-2009 "protective clothing flame retardant protection Part 1 flame retardant clothing"
our dished heads are used in a variety of applications and industries such as storage tanks, pressure vessels, road tank, food processing operations, chemical plants ,Nuclear operation, Oil Refining, Architectural feature, power generation.
Due to our forming experience and equipment, we can spin or press the first part of the process of forming your products, It depend on the thickness and material performance,
Our main products are 2:1 SE dished heads, Torispherical heads, Cones,Hemispherical Heads etc
Choosing the right type is the key decision for each customer and one for which our experience team to happy to give advice, simple speaking, the torispherical heads, the less ressure it can withstand, Conversely, the deeper dished heads, for example Elliptical heads, hemispherical, the greater pressure it can take.
Our in house-capability to form dished heads by cold press brings major benefits to our customers and sets us apart from others dished heads manufactures
For carbon steel dished heads, we can forming this dished heads from 76-9000mm in diameter and below 250mm in thickness
The general forming process as the below sketches 
Technical Delivery Condition
1,Our material (hot Rolled Unalloyed structural steel, high and low temperature steel, High Alloy steel)
We have no carbon steel plates in our stock and most of plates are from Chinese steel market or mill. Meanwhile As Japanese owed company, We can also source the plates from Japanese ex-mill if end user can`t accept ex-chinese mill.
Basically the delivery time shall be below 20days for dished heads if plates are from steel market. and Max plates width from them is below 2200mm. it means that the seamless dished heads diameter shall be below about 1800mm.
The max width CS plates that Chinese mill can do is below 4700mm,and dished heads can be seamless below 3800mm in diameter.
2,Enquiry/order required information
We can give our clients once they gave us the below information
But if clients tolerance is higher than below Hokkai standards, it shall be provided to Hokkai prior to offer or ordering.
Special Material Dished&flared Head
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YIXING HOKKAI HEAD PLATE CO.,LTD , http://www.hokkaidishedend.com