ASTM D4632 地工織物的抓式法斷裂荷重及伸長度
試片尺寸剪至 101.6 mm x 203.2 mm（4in x 8in），同時注意到製作的絲流方向。絲流方向中較長的尺寸與絲流交叉方向是不同的。試片裝載到與夾面留有75 mm (3 in)的夾具上。拉力測試速度要求為300 mm/min(12 in/min)，所要求的測試結果為斷裂荷重及表面伸長度。
地工織物往往有塗層使其由於過度緊縮滑動或夾面斷裂而難以測試，我們建議使用提供易用性、生產力及增強可重複性的 氣動式夾具。氣動式夾具允許使用者以手動操作夾具決定夾持力（可能不那麼具重複性）。此抓式法隨著較長尺寸與負載方向平行指定了 25.4 mm × 50.8 mm（1 in x 2 in）的夾面，對立的夾面至少要夠大，且組合必須要對應到第二個夾具。
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