When it comes to the fire safety work in the buildings, it is inevitable to mention an important role: fire doors. The matching door hardware is the most important thing to make the fire door have the true fireproof function. Today, let’s talk about how the door hardware of D&D Hardware helps the building to solve fire safety problems.

It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved.

IntroductionAustenitic stainless steels are generally non-magnetic with magnetic permeabilities of around 1.0. Permeabilities above 1.0 are associated with the amount of either ferrite or martensite phases present in the 'austenitic' steel and so depend on:chemical composition cold work and heat tr

As a professional door lock manufacturer in China, we provide customers various exterior and interior door lock, like Euro Mortise Lock, Privacy Lock, Deadbolt Lock, Bathroom Door Lock, Narrow Stile Lock, etc. Our door locks are high-quality, durable, anti-rust and textured. The door locks we provide are suitable for wooden door, metal door, fire rated door, double door, single door, steel door of commercial or residential application.

When selecting stainless steel hardware, it is important to understand the differences between the variety of grades and finishes available so you can choose the products that will work most safely and effectively for your purposes. It's difficult to distinguish between these two types of steel visually, but significant differences between the two steel types do exist and are important to understand. Below is a basic guide to the similarities and differences of 304 grade and 316 grade stainless steel.

The D&D Hardware rang of architectural lock is manufactured to the highest engineering standards and designed to offer a high price/performance ratio. They have been successfully type tested to all the requirement of BS EN 12209.

The appropriate specification and correct selection of hinges is crucial to their performance and depends on the following factors; 1. Is it a fire, smoke or emergency escape door? 2. How heavy is the door and what are the door dimension (height, width and thickness)? 3. What is the door's construction and are there any unusal features that could affect the hinges? 4. Where is the door situated e.g internal or external; is it near the coast or in a swiming pool? 5. What level of use/abuse will the door be subject to e.g office, hospital or school corridor? 6. What other items of hardware are to be fitted, that may be affect the hinge performance, typically door closer or door stops? 7. Any other unusal features involved e.g. door has radius top or the door is a bifold.

The door closer is a hydraulic device similar to the spring on the door head. When the door is opened, it can be released after compression, and the door can be closed automatically. It has the function of spring door, which can ensure that the door can be closed to the initial position accurately and timely after being opened.

BS EN 1154:1997 -The European standard for the performance of controlled door closing devices. Providing details on product types, classification by use, test cycles, test cycles, door mass, corrosion resistance, as well as definations, product performance requirements, test apparatus, test methods and marking of products. BS EN 1154:1997 classifies door closers by using a 6 digit coding system.

It is desirable that doors at final exit in public buildings,places of intertainment, shops etc should be fitted with panic devices operated by a horizontal bar or touch bar. the emphasis for products coverd by this standard on safe exit rather than security.

Are classified under the same classifications as the door hardware in/on which they are integrated. This means that the access control systems supplied by GBM Solutions is classified according to EN1303 – cylinder for locks, DIN EN 18252 – locking cylinder for door locks, DIN EN 1906-door handles and door konbs and DIN EN 179 apply for the equipment that we supply .

BS EN 1906 classifies door furniture by using an 8 digit coding system. A similar classification applies to all building hardware productStandards so that complementary items of hardware can be specified to, for instance, a common level of corrosion resistance, category of use, etc. Each digit refers to a particular feature of the product measured against the standard's performance requirements.

D&D grade 3 level handle are suitable for high frequency of use by public or others with little incentive to exercise care and with a high chance of misuse , e.g.public office doors ,common area doors etc.

D&D CE mark European Mortise Lock Successfully tested for conformity to all the requirements of BS EN 12209, 11 Classification:3X910G3BC20