Generally speaking, shorter compartment insulation is suitable for metal pipes with a smaller diameter, smaller wall thickness and lower thermal conductivity: with PROMASTOP®-CC soft penetrations of metal pipes with low thermal conductivity (λ ≤ 58 W/mK), pipe wall thickness 2,0 mm – 14,0 mm and pipe outer pipe diameter up to 42,0 mm require a non-combustible local insulation total centered penetration length of 500 mm; steel pipes with larger pipe wall thickness or outer pipe diameter need a minimum of 1000 mm long local insulation. According to the EN 13501-1 Standard, the reaction to fire classification of the local insulation in PROMASTOP®-CC soft penetration is a minimum of A2-s1, d0 or A2L-s1, d0; its melting-point is a minimum of 1000°C, bulk density is between 40 and 150 kg/m3, and thickness is between 30 and 100 mm. (Warning: this data is not the material characteristics of the mineral wool boards forming the soft penetration itself, as these are covered by a special provision; the thickness in the referred penetration is 1 x 50 mm, 1 x 80 mm or 2 x 50 mm, and the bulk density is minimum 140 kg/m3). The minimum required local insulation length for copper pipes with larger thermal conductivity (λ ≤ 380 W/mK), pipe wall thickness up to 14,2 mm and pipe outer diameter up to 42 mm, is 1000 mm; copper pipes with a larger outer pipe diameter (up to 88 mm) need a minimum of 2000 mm long local insulation.
Not only the Promat solutions require this complicated system, but all producers are expected to present the required insulation length in this way, according to the Test and Classification Standard.