What is the Mineral oil resistance ?

For mineral oil resistance, test pieces of the materials of category II and III are immersed in oil for 70 hours at 100 ºC. The oil
number 2 (IRM 902) has the following characteristics according to ISO 1817:
• Aniline point: 93 ±3 ºC
• Cinematic viscosity: ( 20 ±2 ) 10-6 m2/s
• Flash point: > 240 ºC
After the immersion, the test pieces must comply with the following conditions in respect of the initial state of the material:
• Less than 20 % variation in volume (according to proceedings under Recommendation ISO/R 1817 – Gravimetric method)
• Less than 30 % variation in tensile strength
• Less than 40 % variation in elongation at break