E*P*S synchronous timing belts are available in two materials, neoprene and urethane. Neoprene belts are faced with a nylon wear surface and reinforced with fiberglass cord. Urethane belts are reinforced with polyrester cord.

PIC urethane belts' high abrasion resistance allows operation in applications where the carbon black dusting encountered with other belts cannot be tolerated. The polyester cord provides shock absorption and some vibration dampening capability. This belt is well suited for high speed operation with small pulleys due to its high flexability. Neoprene belts offer greater load carrying capabilities. The high modulus fiberglass reinforcement allows operation without periodic retensioning.E*P*S belts are available fom the PIC with two tooth forms, the usual trapezoidal form and the new, high efficiency, HTD form. The HTD belt employs a cirvilinear tooth which is deeper than the trapezoidal tooth, offering the following advantages:

• Substantial belt size reductions for comparable loads. HTD belts will carry 120% to 200% more horsepower than equivalent trapezoidal tooth belts.
• Speed ratios to 20:1
• Up to 5.5 hp at speeds to 24000 rpm.
• Energy efficient replacement for "V" belt systems.
• Cost savings; narrower belts will handle larger loads.

HTD belts should be considered for new designs as cost saving replacements to solve existing problems. The stress diagram below (figure 1) illustrates the increased load carrying ability of HTD curvilinear form vs. the trapezoidal form. The Design Guide for E*P*S HTD and E*P*S drive systems will enable you to select the appropriate timing belts for your particular application.

HTD Curvilinear Stress concentrated at the center of tooth

Trapezoidal Stress concentrated at the tooth corner