ASTM C1147 : 01(2012)

Standard Practice for Determining the Short Term Tensile Weld Strength of Chemical-Resistant Thermoplastics

Standard Details

1.1 This practice covers the preparation and evaluation of joints between two pieces of weldable grades of thermoplastic materials, backed and unbacked, (such as those shown in Table 1) up to 2 in. (50 mm) in thickness.

TABLE 1 Typical Guide for Hot Gas Welding Temperatures

Note 1—For other welding techniques, consult material and equipment supplier for recommendations.

	°F^A	Recommended Gas Type^B
HDPE	500–600		Nitrogen or Air
PP	550–600		Nitrogen or Air
PVC	500–550		Air
CPVC	550–660		Air
PVDF	650–680		Nitrogen or Air
ECTFE	665–695		Nitrogen
ETFE	675–710		Air
FEP	650–725		Air
PFA	675–750		Air
MFA	536–554		Air

^A Measured ¹/₄ in. inside weld tip, directly in gas stream.

^B Inert gas may be used in place of air.

1.2 Since there are numerous new technologies and techniques constantly being developed for plastic welding, there are no profiles and procedures that can be considered as standard for all plastics at various thicknesses. This practice is not intended to define profiles and procedures; however, it is intended to establish methods to evaluate minimum short term weld factors to be achieved by the welder for the respective plastics.

1.3 Weld procedures used for test pieces should reflect procedures to be used in actual fabrication.

1.4 Welding methods to be used could include machine welding, extrusion welding, and hot gas welding.

1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.