T-shaped chair, height-adjustable, №3-6, flat-oval tube
Dimensions: 385х475х(700-820) mm. Weight: 4,89 kg.
•             height of the seat – 340-460 mm – 340 mm (№3), 380 mm (№4), 420 mm (№5) and 460 mm (№6);
•             seat back size – 380х200 mm;
•             seat size – 380х350 mm.
The chair consists of wooden and metal parts.
Wooden parts represent themselves the seat and the seat back which are made of sloping-glued plywood of 8-9 mm thickness and are covered with colorless eco-friendly water-based varnish. The edges of the seat and the seat back have a radius of rounding to prevent injury.
Metal parts of the chair are made of  flat-oval tubes of 50х30х1,2 mm, 38х20х1,2 mm, 30х15х1,2 mm. Painting of the frame is implemented with the help of polymeric powder  paint, resistant to scratches. In  the places of height adjustment there is a polyurethane transition  sleeve, which ensures smoothness of adjustment, eliminates creaking and  scratches while height adjustment. Height  adjustment is imlemented through end-to-end nut-screw stitching with  fixation of cover nut inside the tube for impossibility of unscrew in  the course of  shattering. Plastic caps are fixed at the ends of the frame  to prevent injury to students and damage to the floor. Fixation  of seats and seat backs to the frame of chair is implemented with the  help of screws of special mushroom-type form and nuts of rounded form,  which prevent injury and damage to the clothes.  On  the lower part of metal frame there is hole through which a marking of  height groups can be seen while adjusting the height of the chair. Color  marking in accordance to the height groups is applied in the form of  the circle of not less than 10 mm. Also the scale of marking of height groups is applied on the metal frame with the help of laser engraving.
Frame color: green (RAL6018), grey (RAL7035), yellow (RAL1018).