### Round hole in staggered row (RT)

#### Perforation mark: R (w) T (t)

• Open area (%): A0 = (90,7 * w2) : t2 u %
• Number of holes per m2: n = 1.154.700:t2
• x = number of distances u; u = 0,866t
• b2 = y * v + w
• y = number of distances v; v = 0,5t
• Perforation direction: a1 ili b1

### Round holes in diagonal row (RM)

#### Perforation mark: R (w) M (t)

• Open area (%): A0 = (78,5 * w2) : t2 u %
• Number of holes per m2: n = 1.000.000:t2
• a2 = Z1 * g + w
• Z1 = number of distances g parallel to a2
• b2 = Z2 * g + w
• Z2 = number of distances g parallel to b2
• g = 0,707t
• Perforation direction: a1 ili b1

### Round hole in staggered row (RT)

#### Perforation mark: R (w) Z (t1 x t2)

• Open area (%): A0 = (78,5 * w2) : 0,5 * (t1 * t2) u %
• Number of holes per m2: n = 1.000.000 : 0,5(t1 * t2)
• a2 = t1 * x + w
• x = number of distances t1
• b2 = t2 * y + w
• y = number of distances t2
• Perforation direction: a1 ili b1

### Round hole in parallel row (RU)

#### Perforation mark: R (w) U (t)

• Open area (%): A0 = (78,5 * w2) : t2 u %
• Number of holes per m2: n = 1.000.000 / t2
• a2 = x1 * u + w
• x1 = number of distances t parallel to a2
• b2 = x2 * t + w
• x2 = number of distances t parallel to b2
• t = w + c
• Perforation direction: a1 ili b1

### Round hole in parallel row (RU)

#### Perforation mark: R (w) U (t1 x t2)

• Open area (%): A0 = (78,5 * w2) / t1 * t2 u %
• Number of holes per m2: n = 1.000.000 / t1 * t2
• a2 = x1 * t + w
• x1 = number of distance t parallel to a2
• b2 = x2 * t + w
• x2 = number of distances t parallel to b2
• t = w + c
• Perforation direction: a1 ili b1

### Europerforation

#### Perforation mark: R5 EURO

• Open area (%): A0 = 8,38 u %
• Number of holes per m2: n = 4.272 