Rigid, versatile, and is suitable for both above and below ground installations. Vibration resistant and anti-magnetic. Un-Plasticised Polyvinyl Chloride possesses many properties that make it a popular choice of material particularly within the construction industry. It has great properties including, strength, durability, resistance to fire and erosion and is also recyclable. PVC is resistant to oxidation and degradation and its inherent chlorine content gives it excellent fire resistance. 50 x nuts, 50 x washers, 50 x bolts M4 x 20mm, Hexagon Head Screws Application: These screws, nuts and washers are an excellent choice for use in the chemical industry, oil refineries, food processing and marine applications. Maximum temperature: 140F