Material Analysis
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ABS brittle cracking——raw material purity and additive problems
Fenómeno do problema
The product is brittle, significantly improved after switching to qualified raw materials, or strongly related to certain batches of raw materials and additives.
Análise das causas
Impurities mixed into the ABS raw material (foreign plastics, dust, oil), or improper type/dosage of additives (stabilizers, plasticizers), will destroy the uniformity of ABS molecular chains and reduce toughness; some inferior materials have wide molecular weight distribution and contain too many rigid chain segments, and are brittle even if the process is reasonable.
Solução
①Select ABS raw materials with qualified purity and uniform molecular weight distribution, preferably from well-known manufacturers; ②avoid mixing foreign plastics, sieve and clean before use; ③strictly control the type and dosage of additives, select additives compatible with ABS; ④inspect incoming materials to eliminate contaminated and deteriorated materials.
Conclusão principal
If ABS brittleness 'gets better after changing material', the problem is in the raw material rather than the process: purity, molecular weight distribution, and additive compatibility are the three gates; no matter how good the process is, it cannot save congenitally poor material.
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